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Yet, rivers around the world are disrupted by outdated dams, weirs, culverts, and other blockages that fragment habitats, block fish migration, and degrade ecological health. The consequences are far-reaching, threatening not only ecosystems but also the communities that depend on healthy rivers. Research by the European Open Rivers Programme has highlighted both the urgent need for action and the immense potential of dam removal to restore ecosystems, improve biodiversity, and revive natural river connectivity. Since 2022, Princeton Hydro President and Principal Geoffrey M. Goll, PE — an expert in water resources engineering — has been collaborating with organizations in Portugal to advance shared goals of river restoration and ecosystem revitalization. In October 2024, Mr. Goll traveled to Portugal, where he met with the organizations driving forward the country’s ecosystem restoration efforts and visited the sites of three key projects he has, or is currently collaborating on. This blog explores those restoration efforts, highlighting how they address the challenges of river fragmentation while establishing a blueprint for future restoration efforts. Galaxes Weir Removal: A Groundbreaking First for Portugal One of the most significant examples of these collaborative restoration efforts is the groundbreaking Galaxes Weir Removal project, which set the stage for future initiatives by addressing river fragmentation on Portugal’s Odeleite River. Galaxes Weir Removal project in Portugal's Algarve Region marked the country’s first civil removal of an obsolete river barrier to benefit migratory fish species. Associação Natureza Portugal in association with World Wildlife Fund Portugal (ANP/WWF), a non-profit NGO dedicated to the conservation of nature and the protection of the planet, reached out to Mr. Goll and Ms. Lisa Hollingsworth-Segedy of American Rivers, to undertake this pioneering effort. Completed in March 2023, the removal of the 2-meter-high Galaxes Weir restored 7.7 kilometers of river connectivity, aiding in the preservation of critical fish species such as the Spanish minnowcarp (Anaecypris hispanica) and the critically endangered European eel (Anguilla anguilla). By improving river flow and ecological conditions, the project also bolstered economically vital fisheries, enhanced recreational opportunities, and supported local tourism, establishing a model for future restoration initiatives. Funding for the Galaxes Weir removal was provided by the European Open Rivers Programme (EORP), a grant-giving organization dedicated to restoring European rivers. The international partnership that brought Mr. Goll and Ms. Hollingsworh-Segedy into the fold was facilitated by connections made through the World Fish Migration Foundation. He and Ms. Hollingsworth-Segedy were asked to provide guidance on the de-construction of this concrete structure. [caption id="attachment_17074" align="aligncenter" width="593"] During his trip in October 2024, Mr. Goll visited the Galaxes Weir removal project site to observe changes to the landscape since the project’s completion in March 2023.[/caption] The success of the Galaxes Weir Removal project highlights the importance of both engineering knowledge and techniques, as well as community engagement. By involving local communities throughout the process, the project fostered a sense of shared responsibility and ensured that the ecological and cultural value of the river was preserved. It also underscored the benefits of dam removal as a swift and effective strategy to enhance biodiversity and promote sustainable river management. The photos below, taken by ANP/WWF, depict the Galaxes Weir project site before, during, and after removal: [gallery link="none" size="medium" ids="17071,17069,17072"] Click here to see more photos, watch videos of the removal process, and read more detailed information about this groundbreaking project. Perofilho Weir Removal: Establishing a Blueprint for River Restoration Building on the success of the Galaxes Weir removal, the ANP/WWF team expanded its efforts to Santarém, Portugal, northeast of Lisbon, on the Perofilho Stream, a tributary of the Tejo River. The Perofilho Weir, a 2-meter-high concrete barrier, fragmented habitats and disrupted the natural flow of the stream. The National Authority for Nature and Forests Conservation (ICNF) identified the Galaxes Weir as one of the obsolete barriers to be removed to improve fish and overall biodiversity in the area and restore fluvial connectivity. This restoration project, initiated in 2023, was led by ANP/WWF in collaboration with SOS Animal (weir owner) and the Santarém Municipal Council (local government). Mr. Goll was invited to design the removal of the concrete weir, including innovative solutions such as the use of live timber crib walls for stream bank stabilization. He also provided consultation to the onsite construction manager during the removal process and conducted a final site walkthrough following construction, offering recommendations to ensure long-term success. The photos below, provided by EORP and by ANP/WWF, depict the Perofilho Weir project site before, during, and after removal: [gallery link="none" size="large" columns="2" ids="17076,17077"] The Perofilho Weir removal, completed in October 2024, restored 2.2 kilometers of the Perofilho Stream—nearly half its total length—reconnecting it with the Tejo River. This comprehensive restoration project addressed sediment management, habitat rehabilitation, and flood risk reduction, resulting in significant improvements to water quality and ecological health. Key species benefiting from these efforts include the Eurasian otter (Lutra lutra) and the Iberian painted frog (Discoglossus galganoi). Notably, it also enabled the first research into fish species inhabiting the stream. This milestone project not only revitalized a critical aquatic ecosystem, it also established a blueprint for future river restoration efforts in Portugal and beyond. During Mr. Goll’s visit to Portugal in October 2024, he toured the Perofilho Weir removal site alongside Maria João Costa, Water Coordinator of ANP/WWF. Together, they participated in a live video event hosted by the World Fish Migration Foundation, celebrating the project’s success. Broadcasted on the Dam Removal Europe YouTube channel, the event highlighted the restoration effort’s impact on biodiversity and river connectivity. If you missed the live broadcast, the recording is available online. Watch now: [embed]https://www.youtube.com/live/PzzDQ86hZZQ?si=GQrEqTPcQRmLKHep[/embed] Oeiras River Restoration: A Comprehensive Plan for Connectivity The Oeiras River in western Algarve winds through rural landscapes, agricultural zones, and small towns before merging with the Arade River. This intermittent Mediterranean stream supports native and endangered species and serves as a habitat for some of Portugal’s most iconic mammals. [caption id="attachment_17061" align="aligncenter" width="681"] Summer refuge pools on the Oeiras River[/caption] Recognizing the river’s ecological significance, the ICNF identified it as a high-priority conservation area with potential for impactful restoration. In collaboration with the company Somincor, ICNF contracted ANP/WWF to evaluate the removal of nine barriers along the river, beginning with the upstream Horta Fialho Weir. To complete the proposed work, ANP/WWF is undertaking several activities, including feasibility assessments, local community and stakeholder engagement, and public environmental education. ANP/WWF engaged Princeton Hydro to prepare the design and specifications for the Horta Fialho Weir removal and develop concept designs for the eight (8) additional barriers. In October 2024, Mr. Goll spent a week in the field alongside ANP/WWF, surveying the Oeiras River and its tributaries, documenting blockages and ecosystem conditions, meeting with local dam owners and community members, and gathering field measurements to inform the designs and specifications. [gallery link="none" size="large" ids="17091,17063,17093"] The photos, kindly provided by Maria João Costa, Water Coordinator of ANP/WWF, show Mr. Goll and Ms. Costa in the field during the October 2024 survey of the Oeiras River and its tributaries. The removal of the Horta Fialho Weir will reconnect 2.34 kilometers of the river and set the stage for removing the eight additional barriers, which would ultimately restore 143.4 kilometers of river connectivity. This ambitious initiative is expected to significantly enhance the river’s ecological health and improve habitats for native and endangered species, including freshwater mussels (Unio tumidiformis, Anodonta anatina, Unio delphinus), and their host fish (Squalius spp.), the migratory European eel (Anguilla anguilla), the Iberian lynx (Lynx pardinus), and the Eurasian otter (Lutra lutra). Beyond ecological benefits, the project offers a unique opportunity to raise awareness about the advantages of dam removal and the critical importance of biodiversity conservation across Portugal. The European Open Rivers Programme is funding this landmark restoration effort. Collaborating for a Sustainable Future Portugal’s ecosystem restoration projects illustrate the impact of international collaboration and knowledge exchange. By removing barriers, reconnecting habitats, and revitalizing ecosystems, these efforts are paving the way for a healthier future for rivers and the communities that depend on them. Through continued partnerships and mutual support, the journey toward sustainable environmental stewardship remains hopeful and promising. Building on the success of these initiatives, Mr. Goll and the Princeton Hydro team look forward to continuing their work in Portugal and beyond, offering technical expertise in ecosystem restoration and barrier removal to support similar efforts around the world. [caption id="attachment_17065" align="aligncenter" width="620"] Morning coffee and work session in Mertola, Portugal[/caption] Acknowledgments: Celebrating the Power of Partnerships This work would not be possible without the dedication of ANP/WWF, the European Open Rivers Programme, the Dam Removal Europe team, The National Authority for Nature and Forests Conservation, Herman Wanningen, and all the local landowners who were committed to the restoration of the Oeiras River. Their commitment to river restoration and biodiversity conservation serves as an inspiration, demonstrating the transformative power of collaboration and shared vision. We encourage you to click the links provided to learn more about these vital organizations. Princeton Hydro has successfully designed, permitted, and overseen the removal of over 84 dams to date. Mr. Goll holds a B.S. in Civil Engineering from Rutgers University and a Master of Engineering Management from UW–Madison. His knowledge encompasses water resources and geotechnical engineering, including sediment management, stream and river restoration, stormwater management, green infrastructure, freshwater wetland and coastal marsh design, dam design, and dam removal. He is recognized as a distinguished leader in advancing innovative and effective solutions for river restoration. [post_title] => How Collaborative Efforts Are Reconnecting Ecosystems & Restoring Rivers in Portugal [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => how-collaborative-efforts-are-reconnecting-ecosystems-restoring-rivers-in-portugal [to_ping] => [pinged] => [post_modified] => 2025-02-26 15:16:21 [post_modified_gmt] => 2025-02-26 15:16:21 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?p=17058 [menu_order] => 0 [post_type] => post [post_mime_type] => [comment_count] => 0 [filter] => raw ) [1] => WP_Post Object ( [ID] => 15689 [post_author] => 1 [post_date] => 2024-10-23 10:03:42 [post_date_gmt] => 2024-10-23 10:03:42 [post_content] => Princeton Hydro is excited to announce that the Musconetcong Island Park Project received the New Jersey Future 2024 Smart Growth Award. This project, led by the Musconetcong Watershed Association (MWA), transformed a crumbling, long-abandoned laboratory into a vibrant, accessible riparian park space that provides opportunities for fishing, wading, paddling, and viewing wildlife in Bethlehem Township, NJ. The site, which once housed a two-story concrete block laboratory used by the Asbury Graphite Mill, had become a hazard after decades of disuse. Located on a quarter-acre island in the Musconetcong River, the building was not only structurally unsound but also in the floodway of the River, posing ongoing risks to the surrounding environment. Through a collaborative, multi-year effort, the abandoned building was demolished, the area was restored, and the island was transformed into a welcoming, accessible space for public enjoyment and recreation. The image below shows the old stairway, laboratory building, and island space with a white outline depicting the project area: Taken in 2018 before construction: [gallery link="none" columns="2" ids="15697,15702"] Taken in 2023 after project completion (photos by MWA): [gallery link="file" columns="2" ids="15706,15707"] The Musconetcong Island Park Project represents a successful collaboration among numerous partners. Led by MWA, the project involved National Fish and Wildlife Foundation, the Township of Bethlehem, Harrington Construction, and Princeton Hydro. Princeton Hydro provided engineering and environmental consulting services for the project. Our scientists and engineers completed all necessary permitting, designed both the conceptual and final restoration plans, and oversaw construction throughout the project. [gallery link="none" columns="2" ids="15695,15696"] Funding for the project was secured through three primary sources: New Jersey Green Acres Program, National Park Foundation, and U.S. Fish and Wildlife Service’s Delaware Watershed Conservation Fund. These grants were instrumental in facilitating the transformation of an industrial relic into a thriving park space, balancing the preservation of the river's natural resources with the creation of an accessible community destination. [caption id="attachment_15690" align="aligncenter" width="1300"] Photo courtesy of the Township of Bethlehem, NJ.[/caption] The two-story concrete block building that once stood on Musconetcong Island was originally the Asbury Graphite Mill laboratory, constructed between 1925 and 1940. It was built on the foundation of a woolen factory that had been destroyed by fire in 1881. The laboratory was used for testing graphite, an inert and non-toxic mineral primarily used for lubrication and other industrial applications. Graphite refining began in Asbury in 1895, when Harry M. Riddle purchased the existing mills and converted them for this specialized purpose. By the early 1980s, the laboratory was abandoned due to frequent flooding and a lack of modern plumbing. Despite its industrial history, the building had become a safety and environmental concern due to its floodway location and deteriorating condition. In 1999, the laboratory building was donated to the Musconetcong Watershed Association, who then initiated efforts to restore the site and transform it into a valuable public resource. Today, the island has been transformed into a place where residents and visitors can enjoy the Musconetcong River. With improved access, new stairways, and interpretive signage sharing the history of the area, Musconetcong Island Park is a prime example of how thoughtful design can blend environmental restoration with community-focused development. [caption id="attachment_15705" align="aligncenter" width="1074"] The Musconetcong Island Park project was completed in Spring 2023. Photo by MWA.[/caption] “We are honored to have contributed to the transformation of Musconetcong Island Park and proud to see this project recognized with a New Jersey Future Smart Growth Award for its role in enhancing the Musconetcong River Watershed. It reflects our commitment to sustainable design and the power of collaboration in creating lasting, positive impacts for both the environment and the community. It’s truly a win-win — removing an obstruction from the floodway while providing public access to the river,” said Geoffrey M. Goll PE, President of Princeton Hydro. Since 2002, the New Jersey Future Smart Growth Awards have celebrated the best examples of sustainable planning and development across the state. The Musconetcong Island Park Project exemplifies these values by enhancing public access to nature, improving resilience to flooding, and fostering sustainable recreation opportunities in the heart of Bethlehem Township. The project showcases the importance of balancing environmental restoration with community needs, creating a space where people can connect with nature while preserving and protecting it for future generations. The 2024 New Jersey Future Smart Growth Awards recognize six outstanding projects that exemplify innovative and sustainable development. This year’s award ceremony and celebration took place yesterday at the New Brunswick Performing Arts Center. [gallery columns="2" size="medium" link="none" ids="15906,15907"] Click here to learn more about the awards and to view the full list of 2024 Smart Growth Award recipients. MWA is an independent, nonprofit organization dedicated to protecting and improving the quality of the natural and cultural resources of the Musconetcong River and its Watershed. Members of the organization are part of a network of individuals, families, and companies that care about the Musconetcong River and its watershed, and are dedicated to improving the watershed resources through public education and awareness programs, river water quality monitoring, promotion of sustainable land management practices, and community involvement. Click here to learn more. Princeton Hydro has been working with MWA in the areas of river restoration, dam removal, and engineering consulting since 2003. Explore how the partnership between Princeton Hydro and the MWA led to the historic return of American shad to the Musconetcong River for the first time in over 250 years, revitalizing the ecosystem—read the full story here! [post_title] => Musconetcong Island Park Project Wins New Jersey Future 2024 Smart Growth Award [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => musconetcong-island-park-project-wins-new-jersey-future-2024-smart-growth-award [to_ping] => [pinged] => [post_modified] => 2025-03-07 13:15:33 [post_modified_gmt] => 2025-03-07 13:15:33 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?p=15689 [menu_order] => 0 [post_type] => post [post_mime_type] => [comment_count] => 0 [filter] => raw ) [2] => WP_Post Object ( [ID] => 15760 [post_author] => 1 [post_date] => 2024-09-24 21:58:58 [post_date_gmt] => 2024-09-24 21:58:58 [post_content] => New Jersey Department of Environmental Protection (NJDEP) Commissioner Shawn M. LaTourette presented the City of Lambertville with the NJDEP "Our Water’s Worth It" award. The award ceremony, held at a stormwater infrastructure improvement project site behind the Lambertville Firehouse, celebrated the Lambertville's commitment to improving stormwater management, addressing flooding, protecting local waterbodies, increasing storm resilience, and mitigating the impacts of climate change. In a press release announcing the award, Commissioner LaTourette said, “Modernization of stormwater management strategies and infrastructure is critical to mitigating flooding that is severely impacting communities across New Jersey. My DEP colleagues and I applaud Lambertville for paving the way for others to follow in managing stormwater more effectively.” The "Our Water’s Worth It" campaign, launched by NJDEP earlier this year, aims to raise awareness about the importance of protecting New Jersey’s water resources. The campaign highlights municipalities, water systems, and others who go above and beyond in water resource management and infrastructure improvements. Lambertville’s forward-thinking approach to stormwater management, particularly in meeting permitting requirements ahead of schedule, earned the city this well-deserved recognition. Partnering for Progress: Princeton Hydro and the City of Lambertville At Princeton Hydro, we are proud to support the City of Lambertville in its stormwater management initiatives. Our team has been working closely with Lambertville to design projects that not only mitigate flooding but also enhance the surrounding natural environment. During the award ceremony, Senior Project Manager and Professional Engineer, Sean Walsh, PE, said: “We are honored to be here today alongside NJDEP and the City of Lambertville celebrating Lambertville's remarkable achievement in receiving the 'Our Water's Worth It' trophy. It's particularly meaningful that this recognition comes during Climate Week, underscoring the importance of local action in addressing global environmental challenges.” Earlier this year, the Princeton Hydro team completed a comprehensive Stormwater Utility Feasibility Study, which provided critical insights into Lambertville’s current stormwater management capacity and forecasted future needs. Among the ongoing projects, Princeton Hydro is evaluating solutions for capturing runoff and reducing flooding in Lambertville's Music Mountain area, a critical greenspace in the heart of the city. This steep, wooded hillside, home to popular nature trails, serves as a cherished spot for after-school exploration, dog walking, and outdoor recreation. Music Mountain also plays a critical role in the city’s stormwater management system, acting as a natural buffer to protect lower-lying areas from flash flooding caused by runoff from the residential neighborhoods above. However, storm sewer outfalls discharging into the hillside have created deep erosion gullies, and during heavy rain events, the runoff has flooded the Fire Department. In collaboration with the City and the Fire Department, Princeton Hydro is designing a comprehensive solution that includes both the installation of a piped stormwater system and enlarging the inlet at the base of the mountain to better capture surface water runoff. [gallery columns="2" link="none" size="medium" ids="15769,15770"] Additionally, on the Closson Farm property, Princeton Hydro is designing a riparian restoration project to manage the effects of increasing storm intensity. Funded by the National Fish and Wildlife Foundation, this project will result in 4.6 acres of restored floodplain, 300 trees planted, creation of wildlife habitat, measurable sediment and nutrient reduction, reduced stormwater runoff, community engagement, and new walking paths for recreation. “Together with Lambertville, we are taking essential steps to enhance the city’s infrastructure and safeguard the community against future flooding. Our partnership reflects a shared commitment to protecting the environment and promoting resilience,” said Princeton Hydro’s Director of Restoration & Resilience, Christiana Pollack, CFM, GISP. A Model for Resilience and Stewardship By embracing innovative stormwater solutions, Lambertville is not only enhancing its infrastructure but also setting a benchmark for resilience and environmental stewardship across New Jersey. This recognition reflects the city’s commitment to proactive flood management and sustainability, serving as an inspiration for other communities. Princeton Hydro is honored to partner with the City of Lambertville on these important efforts. We extend our heartfelt congratulations on this well-deserved recognition and are excited to continue our collaboration on future projects that will further strengthen the city's resilience and protect its vibrant neighborhoods. To learn more about NJDEP’s "Our Water’s Worth It" campaign, watch the video below: [embed]https://youtu.be/0kwuBLSl8tE?si=_KkaeeMkLI7RNchH[/embed] New Jersey’s water-related infrastructure is a complex system, constantly facing the challenges posed by stormwater runoff and working to properly manage it. Stormwater management isn’t just about handling rainfall; it’s a critical aspect of improving water quality and mitigating flood risks. In New Jersey, where urbanization and rainfall patterns intersect, managing stormwater is more than just a priority; it’s a necessity. To learn more about stormwater management solutions, check out our blog: "In the Eye of the Storm: Exploring A Stormwater Utility in New Jersey." [post_title] => City of Lambertville Honored with NJDEP Award for Stormwater Management Efforts [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => city-of-lambertville-honored-with-njdep-award-for-stormwater-management-efforts [to_ping] => [pinged] => [post_modified] => 2024-09-24 21:58:58 [post_modified_gmt] => 2024-09-24 21:58:58 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?p=15760 [menu_order] => 0 [post_type] => post [post_mime_type] => [comment_count] => 0 [filter] => raw ) [3] => WP_Post Object ( [ID] => 14684 [post_author] => 1 [post_date] => 2024-04-10 15:23:17 [post_date_gmt] => 2024-04-10 15:23:17 [post_content] => Nestled within the New Jersey townships of Hamilton, Robbinsville, and West Windsor lies Miry Run Dam Site 21—an expansive 279-acre parcel with a rich history dating back to its acquisition by Mercer County in the late 1970s. Originally earmarked for flood mitigation and recreation, this hidden gem is on the cusp of a remarkable transformation, poised to unveil its true potential as a thriving public park. Central to the revitalization efforts is a comprehensive Master Plan, meticulously crafted by Mercer County Park Commission in partnership with Simone Collins Landscape Architecture and Princeton Hydro. This visionary roadmap encompasses a spectrum of engineering and ecological uplift initiatives, including:
Rivers are the lifeblood of ecosystems, weaving through landscapes to connect habitats, sustain biodiversity, and provide vital resources to communities. Yet, rivers around the world are disrupted by outdated dams, weirs, culverts, and other blockages that fragment habitats, block fish migration, and degrade ecological health. The consequences are far-reaching, threatening not only ecosystems but also the communities that depend on healthy rivers.
Research by the European Open Rivers Programme has highlighted both the urgent need for action and the immense potential of dam removal to restore ecosystems, improve biodiversity, and revive natural river connectivity.
Since 2022, Princeton Hydro President and Principal Geoffrey M. Goll, PE — an expert in water resources engineering — has been collaborating with organizations in Portugal to advance shared goals of river restoration and ecosystem revitalization. In October 2024, Mr. Goll traveled to Portugal, where he met with the organizations driving forward the country’s ecosystem restoration efforts and visited the sites of three key projects he has, or is currently collaborating on.
This blog explores those restoration efforts, highlighting how they address the challenges of river fragmentation while establishing a blueprint for future restoration efforts.
One of the most significant examples of these collaborative restoration efforts is the groundbreaking Galaxes Weir Removal project, which set the stage for future initiatives by addressing river fragmentation on Portugal’s Odeleite River.
Galaxes Weir Removal project in Portugal's Algarve Region marked the country’s first civil removal of an obsolete river barrier to benefit migratory fish species. Associação Natureza Portugal in association with World Wildlife Fund Portugal (ANP/WWF), a non-profit NGO dedicated to the conservation of nature and the protection of the planet, reached out to Mr. Goll and Ms. Lisa Hollingsworth-Segedy of American Rivers, to undertake this pioneering effort.
Completed in March 2023, the removal of the 2-meter-high Galaxes Weir restored 7.7 kilometers of river connectivity, aiding in the preservation of critical fish species such as the Spanish minnowcarp (Anaecypris hispanica) and the critically endangered European eel (Anguilla anguilla). By improving river flow and ecological conditions, the project also bolstered economically vital fisheries, enhanced recreational opportunities, and supported local tourism, establishing a model for future restoration initiatives. Funding for the Galaxes Weir removal was provided by the European Open Rivers Programme (EORP), a grant-giving organization dedicated to restoring European rivers. The international partnership that brought Mr. Goll and Ms. Hollingsworh-Segedy into the fold was facilitated by connections made through the World Fish Migration Foundation. He and Ms. Hollingsworth-Segedy were asked to provide guidance on the de-construction of this concrete structure.
The success of the Galaxes Weir Removal project highlights the importance of both engineering knowledge and techniques, as well as community engagement. By involving local communities throughout the process, the project fostered a sense of shared responsibility and ensured that the ecological and cultural value of the river was preserved. It also underscored the benefits of dam removal as a swift and effective strategy to enhance biodiversity and promote sustainable river management.
Building on the success of the Galaxes Weir removal, the ANP/WWF team expanded its efforts to Santarém, Portugal, northeast of Lisbon, on the Perofilho Stream, a tributary of the Tejo River. The Perofilho Weir, a 2-meter-high concrete barrier, fragmented habitats and disrupted the natural flow of the stream. The National Authority for Nature and Forests Conservation (ICNF) identified the Galaxes Weir as one of the obsolete barriers to be removed to improve fish and overall biodiversity in the area and restore fluvial connectivity.
This restoration project, initiated in 2023, was led by ANP/WWF in collaboration with SOS Animal (weir owner) and the Santarém Municipal Council (local government). Mr. Goll was invited to design the removal of the concrete weir, including innovative solutions such as the use of live timber crib walls for stream bank stabilization. He also provided consultation to the onsite construction manager during the removal process and conducted a final site walkthrough following construction, offering recommendations to ensure long-term success.
The Perofilho Weir removal, completed in October 2024, restored 2.2 kilometers of the Perofilho Stream—nearly half its total length—reconnecting it with the Tejo River. This comprehensive restoration project addressed sediment management, habitat rehabilitation, and flood risk reduction, resulting in significant improvements to water quality and ecological health. Key species benefiting from these efforts include the Eurasian otter (Lutra lutra) and the Iberian painted frog (Discoglossus galganoi). Notably, it also enabled the first research into fish species inhabiting the stream.
This milestone project not only revitalized a critical aquatic ecosystem, it also established a blueprint for future river restoration efforts in Portugal and beyond.
During Mr. Goll’s visit to Portugal in October 2024, he toured the Perofilho Weir removal site alongside Maria João Costa, Water Coordinator of ANP/WWF. Together, they participated in a live video event hosted by the World Fish Migration Foundation, celebrating the project’s success. Broadcasted on the Dam Removal Europe YouTube channel, the event highlighted the restoration effort’s impact on biodiversity and river connectivity. If you missed the live broadcast, the recording is available online. Watch now:
The Oeiras River in western Algarve winds through rural landscapes, agricultural zones, and small towns before merging with the Arade River. This intermittent Mediterranean stream supports native and endangered species and serves as a habitat for some of Portugal’s most iconic mammals.
Recognizing the river’s ecological significance, the ICNF identified it as a high-priority conservation area with potential for impactful restoration. In collaboration with the company Somincor, ICNF contracted ANP/WWF to evaluate the removal of nine barriers along the river, beginning with the upstream Horta Fialho Weir.
To complete the proposed work, ANP/WWF is undertaking several activities, including feasibility assessments, local community and stakeholder engagement, and public environmental education. ANP/WWF engaged Princeton Hydro to prepare the design and specifications for the Horta Fialho Weir removal and develop concept designs for the eight (8) additional barriers.
In October 2024, Mr. Goll spent a week in the field alongside ANP/WWF, surveying the Oeiras River and its tributaries, documenting blockages and ecosystem conditions, meeting with local dam owners and community members, and gathering field measurements to inform the designs and specifications.
The removal of the Horta Fialho Weir will reconnect 2.34 kilometers of the river and set the stage for removing the eight additional barriers, which would ultimately restore 143.4 kilometers of river connectivity. This ambitious initiative is expected to significantly enhance the river’s ecological health and improve habitats for native and endangered species, including freshwater mussels (Unio tumidiformis, Anodonta anatina, Unio delphinus), and their host fish (Squalius spp.), the migratory European eel (Anguilla anguilla), the Iberian lynx (Lynx pardinus), and the Eurasian otter (Lutra lutra).
Beyond ecological benefits, the project offers a unique opportunity to raise awareness about the advantages of dam removal and the critical importance of biodiversity conservation across Portugal. The European Open Rivers Programme is funding this landmark restoration effort.
Portugal’s ecosystem restoration projects illustrate the impact of international collaboration and knowledge exchange. By removing barriers, reconnecting habitats, and revitalizing ecosystems, these efforts are paving the way for a healthier future for rivers and the communities that depend on them. Through continued partnerships and mutual support, the journey toward sustainable environmental stewardship remains hopeful and promising.
Building on the success of these initiatives, Mr. Goll and the Princeton Hydro team look forward to continuing their work in Portugal and beyond, offering technical expertise in ecosystem restoration and barrier removal to support similar efforts around the world.
This work would not be possible without the dedication of ANP/WWF, the European Open Rivers Programme, the Dam Removal Europe team, The National Authority for Nature and Forests Conservation, Herman Wanningen, and all the local landowners who were committed to the restoration of the Oeiras River. Their commitment to river restoration and biodiversity conservation serves as an inspiration, demonstrating the transformative power of collaboration and shared vision. We encourage you to click the links provided to learn more about these vital organizations.
Princeton Hydro has successfully designed, permitted, and overseen the removal of over 84 dams to date. Mr. Goll holds a B.S. in Civil Engineering from Rutgers University and a Master of Engineering Management from UW–Madison. His knowledge encompasses water resources and geotechnical engineering, including sediment management, stream and river restoration, stormwater management, green infrastructure, freshwater wetland and coastal marsh design, dam design, and dam removal. He is recognized as a distinguished leader in advancing innovative and effective solutions for river restoration.
Princeton Hydro is excited to announce that the Musconetcong Island Park Project received the New Jersey Future 2024 Smart Growth Award. This project, led by the Musconetcong Watershed Association (MWA), transformed a crumbling, long-abandoned laboratory into a vibrant, accessible riparian park space that provides opportunities for fishing, wading, paddling, and viewing wildlife in Bethlehem Township, NJ.
The site, which once housed a two-story concrete block laboratory used by the Asbury Graphite Mill, had become a hazard after decades of disuse. Located on a quarter-acre island in the Musconetcong River, the building was not only structurally unsound but also in the floodway of the River, posing ongoing risks to the surrounding environment. Through a collaborative, multi-year effort, the abandoned building was demolished, the area was restored, and the island was transformed into a welcoming, accessible space for public enjoyment and recreation.
The image below shows the old stairway, laboratory building, and island space with a white outline depicting the project area:
The Musconetcong Island Park Project represents a successful collaboration among numerous partners. Led by MWA, the project involved National Fish and Wildlife Foundation, the Township of Bethlehem, Harrington Construction, and Princeton Hydro.
Princeton Hydro provided engineering and environmental consulting services for the project. Our scientists and engineers completed all necessary permitting, designed both the conceptual and final restoration plans, and oversaw construction throughout the project.
Funding for the project was secured through three primary sources: New Jersey Green Acres Program, National Park Foundation, and U.S. Fish and Wildlife Service’s Delaware Watershed Conservation Fund. These grants were instrumental in facilitating the transformation of an industrial relic into a thriving park space, balancing the preservation of the river's natural resources with the creation of an accessible community destination.
The two-story concrete block building that once stood on Musconetcong Island was originally the Asbury Graphite Mill laboratory, constructed between 1925 and 1940. It was built on the foundation of a woolen factory that had been destroyed by fire in 1881. The laboratory was used for testing graphite, an inert and non-toxic mineral primarily used for lubrication and other industrial applications. Graphite refining began in Asbury in 1895, when Harry M. Riddle purchased the existing mills and converted them for this specialized purpose.
By the early 1980s, the laboratory was abandoned due to frequent flooding and a lack of modern plumbing. Despite its industrial history, the building had become a safety and environmental concern due to its floodway location and deteriorating condition. In 1999, the laboratory building was donated to the Musconetcong Watershed Association, who then initiated efforts to restore the site and transform it into a valuable public resource.
Today, the island has been transformed into a place where residents and visitors can enjoy the Musconetcong River. With improved access, new stairways, and interpretive signage sharing the history of the area, Musconetcong Island Park is a prime example of how thoughtful design can blend environmental restoration with community-focused development.
“We are honored to have contributed to the transformation of Musconetcong Island Park and proud to see this project recognized with a New Jersey Future Smart Growth Award for its role in enhancing the Musconetcong River Watershed. It reflects our commitment to sustainable design and the power of collaboration in creating lasting, positive impacts for both the environment and the community. It’s truly a win-win — removing an obstruction from the floodway while providing public access to the river,” said Geoffrey M. Goll PE, President of Princeton Hydro.
Since 2002, the New Jersey Future Smart Growth Awards have celebrated the best examples of sustainable planning and development across the state. The Musconetcong Island Park Project exemplifies these values by enhancing public access to nature, improving resilience to flooding, and fostering sustainable recreation opportunities in the heart of Bethlehem Township. The project showcases the importance of balancing environmental restoration with community needs, creating a space where people can connect with nature while preserving and protecting it for future generations.
The 2024 New Jersey Future Smart Growth Awards recognize six outstanding projects that exemplify innovative and sustainable development. This year’s award ceremony and celebration took place yesterday at the New Brunswick Performing Arts Center.
Click here to learn more about the awards and to view the full list of 2024 Smart Growth Award recipients.
MWA is an independent, nonprofit organization dedicated to protecting and improving the quality of the natural and cultural resources of the Musconetcong River and its Watershed. Members of the organization are part of a network of individuals, families, and companies that care about the Musconetcong River and its watershed, and are dedicated to improving the watershed resources through public education and awareness programs, river water quality monitoring, promotion of sustainable land management practices, and community involvement. Click here to learn more.
Princeton Hydro has been working with MWA in the areas of river restoration, dam removal, and engineering consulting since 2003. Explore how the partnership between Princeton Hydro and the MWA led to the historic return of American shad to the Musconetcong River for the first time in over 250 years, revitalizing the ecosystem—read the full story here!
New Jersey Department of Environmental Protection (NJDEP) Commissioner Shawn M. LaTourette presented the City of Lambertville with the NJDEP "Our Water’s Worth It" award. The award ceremony, held at a stormwater infrastructure improvement project site behind the Lambertville Firehouse, celebrated the Lambertville's commitment to improving stormwater management, addressing flooding, protecting local waterbodies, increasing storm resilience, and mitigating the impacts of climate change.
In a press release announcing the award, Commissioner LaTourette said, “Modernization of stormwater management strategies and infrastructure is critical to mitigating flooding that is severely impacting communities across New Jersey. My DEP colleagues and I applaud Lambertville for paving the way for others to follow in managing stormwater more effectively.”
The "Our Water’s Worth It" campaign, launched by NJDEP earlier this year, aims to raise awareness about the importance of protecting New Jersey’s water resources. The campaign highlights municipalities, water systems, and others who go above and beyond in water resource management and infrastructure improvements. Lambertville’s forward-thinking approach to stormwater management, particularly in meeting permitting requirements ahead of schedule, earned the city this well-deserved recognition.
At Princeton Hydro, we are proud to support the City of Lambertville in its stormwater management initiatives. Our team has been working closely with Lambertville to design projects that not only mitigate flooding but also enhance the surrounding natural environment.
During the award ceremony, Senior Project Manager and Professional Engineer, Sean Walsh, PE, said: “We are honored to be here today alongside NJDEP and the City of Lambertville celebrating Lambertville's remarkable achievement in receiving the 'Our Water's Worth It' trophy. It's particularly meaningful that this recognition comes during Climate Week, underscoring the importance of local action in addressing global environmental challenges.”
Earlier this year, the Princeton Hydro team completed a comprehensive Stormwater Utility Feasibility Study, which provided critical insights into Lambertville’s current stormwater management capacity and forecasted future needs.
Among the ongoing projects, Princeton Hydro is evaluating solutions for capturing runoff and reducing flooding in Lambertville's Music Mountain area, a critical greenspace in the heart of the city. This steep, wooded hillside, home to popular nature trails, serves as a cherished spot for after-school exploration, dog walking, and outdoor recreation. Music Mountain also plays a critical role in the city’s stormwater management system, acting as a natural buffer to protect lower-lying areas from flash flooding caused by runoff from the residential neighborhoods above. However, storm sewer outfalls discharging into the hillside have created deep erosion gullies, and during heavy rain events, the runoff has flooded the Fire Department. In collaboration with the City and the Fire Department, Princeton Hydro is designing a comprehensive solution that includes both the installation of a piped stormwater system and enlarging the inlet at the base of the mountain to better capture surface water runoff.
Additionally, on the Closson Farm property, Princeton Hydro is designing a riparian restoration project to manage the effects of increasing storm intensity. Funded by the National Fish and Wildlife Foundation, this project will result in 4.6 acres of restored floodplain, 300 trees planted, creation of wildlife habitat, measurable sediment and nutrient reduction, reduced stormwater runoff, community engagement, and new walking paths for recreation.
“Together with Lambertville, we are taking essential steps to enhance the city’s infrastructure and safeguard the community against future flooding. Our partnership reflects a shared commitment to protecting the environment and promoting resilience,” said Princeton Hydro’s Director of Restoration & Resilience, Christiana Pollack, CFM, GISP.
By embracing innovative stormwater solutions, Lambertville is not only enhancing its infrastructure but also setting a benchmark for resilience and environmental stewardship across New Jersey. This recognition reflects the city’s commitment to proactive flood management and sustainability, serving as an inspiration for other communities.
Princeton Hydro is honored to partner with the City of Lambertville on these important efforts. We extend our heartfelt congratulations on this well-deserved recognition and are excited to continue our collaboration on future projects that will further strengthen the city's resilience and protect its vibrant neighborhoods.
To learn more about NJDEP’s "Our Water’s Worth It" campaign, watch the video below:
New Jersey’s water-related infrastructure is a complex system, constantly facing the challenges posed by stormwater runoff and working to properly manage it. Stormwater management isn’t just about handling rainfall; it’s a critical aspect of improving water quality and mitigating flood risks. In New Jersey, where urbanization and rainfall patterns intersect, managing stormwater is more than just a priority; it’s a necessity. To learn more about stormwater management solutions, check out our blog: "In the Eye of the Storm: Exploring A Stormwater Utility in New Jersey."
Nestled within the New Jersey townships of Hamilton, Robbinsville, and West Windsor lies Miry Run Dam Site 21—an expansive 279-acre parcel with a rich history dating back to its acquisition by Mercer County in the late 1970s. Originally earmarked for flood mitigation and recreation, this hidden gem is on the cusp of a remarkable transformation, poised to unveil its true potential as a thriving public park.
Central to the revitalization efforts is a comprehensive Master Plan, meticulously crafted by Mercer County Park Commission in partnership with Simone Collins Landscape Architecture and Princeton Hydro. This visionary roadmap encompasses a spectrum of engineering and ecological uplift initiatives, including:
The Master Plan serves as a long-term vision for improvements to the property and will be implemented over multiple phases. In 2021, it was recognized with the Landscape Architectural Chapter Award from the New Jersey Chapter American Society of Landscape Architects, which underscores its innovative and impactful approach to landscape design.
Now, Dam Site 21’s revitalization has begun with a crucial endeavor: the dredging of its 50-acre lake. This process, spearheaded by Mercer County Park Commission in collaboration with Princeton Hydro, aims to rejuvenate the water body by removing accumulated debris, sediment, and invasive vegetation—a vital step towards restoring its ecological balance. Beyond the aesthetic and ecological improvements, dredging enhances accessibility for recreational activities that provide an opportunity to create a deeper connection between the park’s visitors and its beautiful natural landscape.
Based on the bathymetric assessment, which the Princeton Hydro team completed as part of the Master Plan, the dredging efforts are focused on three primary areas: Area 1 is located in the main body of the lake just downstream of Line Road and will generate approximately 34,000 cubic yards of dredged material; Area 2, which has approximately 4,900 cubic yards of accumulated sediment is located in the northeast cove, just north of Area 1; and Area 3, the northwestern cove, entails the removal of approximately 7,300 cubic yards of accumulated sediment.
Before the dredging work could begin, the Princeton Hydro team was responsible for providing a sediment sampling plan, sample collection and laboratory analysis, engineering design plan, preparation and submission of all NJDEP regulatory permitting materials, preparation of the technical specifications, and bid administration. Currently, our team is providing construction administration and oversight for the project.
The journey towards Dam Site 21's revival has been marked by meticulous planning, design, and community engagement spanning several years. With the commencement of dredging operations, the project's vision is gradually materializing—a testament to the dedication of all stakeholders involved. As the first phase unfolds, anticipation mounts for the realization of a vibrant, inclusive public space that honors both nature and community.
As Dam Site 21 undergoes its metamorphosis, it symbolizes not just a physical restoration, but a renewal of collective vision and commitment. Ultimately, Dam Site 21 isn't just a park—it's a testament to the enduring legacy of conservation, community, and the transformative power of restoration.
The significance of Dam Site 21's transformation extends far beyond its recreational appeal. It embodies a commitment to environmental stewardship, with measures aimed at bolstering flood resilience, improving water quality, and nurturing diverse wildlife habitats. By blending conservation with recreation, the project strikes an important balance between creating access for community members to enjoy the space and ecological preservation that puts native plants, critical habitat, and wildlife at the forefront.
To learn more about the restoration initiative and view the Final Master Plan, visit the Mercer County Park Commission’s website. Click here to learn about another one of Princeton Hydro’s recent restoration efforts. And, stay tuned here for more Mercer County Park Commission project updates!
New Jersey’s water-related infrastructure is a complex system, constantly facing the challenges posed by stormwater runoff and working to properly manage it. Stormwater management isn’t just about handling rainfall; it’s a critical aspect of preserving water quality and mitigating flooding risks. In New Jersey, where urbanization and rainfall patterns intersect, managing stormwater is more than just a priority; it’s a necessity. Enter a stormwater utility— a dedicated fee to address these stormwater management challenges.
New Jersey’s stormwater infrastructure (storm drains, sewer piping, etc.) is aging and unable to effectively handle the amount of runoff that has been flowing through the region in recent years. This is causing increased nutrient runoff and flooding in communities throughout the state. With increasing global temperatures and the proliferation of intense storm systems, this trend is likely to continue.
To address these issues, in 2019, New Jersey enacted the Clean Stormwater & Flood Reduction Law that allows municipalities, counties, groups of municipalities, and sewage and improvement authorities to establish a stormwater utility.
For many local leaders, the process to establish a utility can be complex, often depending on a number of details like the scope of the work and size of the community. In 2021, Princeton Hydro teamed up with the New Jersey League of Conservation Voters, New Jersey Future, and Flood Defense New Jersey to host a webinar explaining the purpose of a stormwater utility; how a stormwater utility works; how to decide if a stormwater utility is the right fit for a particular community; and how municipalities or counties can implement one.
In 2022, New Jersey Department of Environmental Protection (NJDEP) announced the availability of Technical Assistance for Stormwater Utility Feasibility Studies, which supports municipalities in completing a stormwater utility feasibility study. Stormwater feasibility studies can help communities weigh the costs and benefits of having a stormwater utility to determine if it's right for them. Princeton Hydro is currently conducting a feasibility study for the City of Lambertville.
Jersey Water Works is a collaborative effort of many diverse organizations and individuals who embrace the common purpose of transforming New Jersey’s water infrastructure. They bring people together to find equitable solutions focused on: Clean water and waterways; healthier, safer neighborhoods; local jobs; flood and climate resilience; and economic growth. Jersey Water Works consists of many different committees run by volunteers, including the Stormwater Utilities Subcommittee, which is part of the Asset Management and Finance Committee.
The Jersey Waterworks Stormwater Utility Subcommittee launched the “Stormwater Utility Informational Forum” comprising five one-hour-long, town-hall-style education sessions. Each session featured expert panelists who explored various aspects of creating a stormwater utility and establishing a sustainable and dedicated funding mechanism to pay for a community’s stormwater management program.
Utility leaders, government stormwater managers, municipal and county representatives, elected officials, experts and stakeholders came together to discuss the topics of stormwater financial planning and funding options; New Jersey legislation and the utility development process; stormwater rate structures and credits; stormwater utility policies; and stakeholder engagement.
Key leaders in the Stormwater Utility subcommittee who organized the information forum include Dana Patterson Grear, Director of Marketing and Communications for Princeton Hydro (co-chair); Micah Shapiro of RES (co-chair); Prabha Kumar of Black & Veatch Management Consulting LLC; and Elizabeth Treadway of WSP. The forum presenters included Prabha Kumar, Elizabeth Treadway, Dana Patterson Grear, Dave Mason of CDM Smith; Lindsey Sigmund of New Jersey Future.
Prabha Kumar and Dana Patterson Grear led the final session of the forum, which was dedicated to Stakeholder Engagement. They shared their expert recommendations and real-world experience in fostering community involvement, navigating the complexities of stakeholder engagement, and developing inclusive public meetings and dialogues related to implementing a stormwater utility feasibility study.
The presentation emphasized the significance of prioritizing stakeholder engagement early on and maintaining consistent engagement throughout the entire stormwater utility feasibility process. Prabha and Dana also provided tons of easy-to-follow, actionable tips, including:
How to structure your stakeholder groups, including the creation of a project team, a project champion and internal steering committee;
Which local community groups, municipal entities, and other external stakeholders to include in the conversation and when to include them;
Key factors in planning public workshops, like how many workshops to host, should the workshops be virtual or in-person, and how to structure the agenda for the best results; and
How to create engaging graphics, solicit feedback and educate the target audience in ways that are inclusive, informative and tailored to the unique characteristics of the community.
"Creating a stormwater utility in your community can be challenging as it is a public policymaking process. Engaging stakeholders throughout the entire process and educating the public is not just a step; it's the cornerstone to success," said Dana. "It's about embracing a diversity of voices from day one, listening to concerns and ideas, and collaboratively shaping a solution that resonates with your communities' needs."
Watch the full presentation.
The Stormwater Utility Information Forum served as a platform for sharing expertise and fostering dialogue around supporting community efforts to properly manage stormwater and protect water quality. As the conversation continues, it's crucial to leverage these insights to drive meaningful change in stormwater management initiatives across New Jersey.
The sessions were held via Zoom and the recordings of the forum sessions made available on the Jersey Water Works website. The recorded sessions serve as invaluable resources for individuals, communities, and policymakers interested in delving deeper into stormwater management.
The journey towards sustainable stormwater management is ongoing. If you or your community are interested in furthering this cause or exploring a stormwater utility, don't hesitate to reach out. The Jersey Water Works Stormwater Utility Subcommittee and Princeton Hydro welcome all voices committed to creating a more resilient and equitable water infrastructure. For more information about the Stormwater Utility Subcommittee or to get involved, please contact info@jerseywaterworks.org. Also, please explore New Jersey Future's New Jersey Stormwater Utility Resource Center which is a treasure trove of resources on this topic!
Princeton Hydro is a leader in innovative, cost-effective, and environmentally sound stormwater management systems. The preparation of stormwater management plans and design of stormwater management systems for pollutant reduction is an integral part of our projects - learn more.
The removal of Beatty's Mill Dam stands as a pivotal moment in the conservation efforts along the Musconetcong River. This critical initiative, spearheaded by the Musconetcong Watershed Association (MWA), Washington Township, and the Town of Hackettstown in collaboration with Princeton Hydro and RiverLogic Solutions, marks a significant stride towards rejuvenating the river's natural ecosystem and addressing long-standing concerns regarding flood mitigation and habitat preservation.
Beatty's Mill Dam straddles the border between Warren and Morris Counties in Hackettstown and Washington Township, New Jersey. It is a 6-foot-high stone masonry, concrete, and earth embankment dam that was built in the 18th century and has been non-functional for decades.
Beatty’s Mill Dam is a low-head dam, which means it was not built to protect communities from flooding and can make flooding worse in some cases. Hackettstown and Washington Township are also more susceptible to flooding and erosion due to the high percentage of impervious surfaces, like roads and parking lots, which cause higher flows of stormwater runoff.
A dam safety report from 1981 shows that the dam had been breached on the eastern end. The breach caused a hairpin turn where the river is diverted sharply to the east then back to the west before flowing under the East Avenue bridge. Over time, this created erosive conditions at the upstream side of the bridge and roadbed, threatening the integrity of the infrastructure. Additionally, extensive alteration of the floodplain occurred upstream of the dam, including an elevated earthen berm along the left bank, and general land disturbance in both upland and wetlands.
The removal of the dam not only addresses the structural concerns but also holds the promise of extensive environmental improvements. By eradicating barriers to the Musconetcong River's natural flow, restoring the floodplain, and implementing strategies to curb stormwater runoff, this initiative aims to mitigate flooding, promote water quality, and foster a thriving habitat for aquatic organisms including indigenous species like the Eastern Brook Trout and American Eel.
With funding from the Highlands Council, Princeton Hydro was contracted in 2019 by Washington Township to complete a water quality assessment, hydrologic and hydraulic analysis, and functional value stream assessment of reaches of the Musconetcong River that encompassed the Beatty’s Mill site (and the downstream Newburgh Dam site). Following the New Jersey Highlands Water Protection and Planning Council guidance, Princeton Hydro assessed and rated the river reaches on five functional values: channel integrity, habitat, water quality, temperature moderation, and public use. The Beatty’s Mill Dam, floodplain encroachment, narrow riparian buffers, and non-native riparian vegetation were the primary sources of impact to the functional values.
Subsequently, Princeton Hydro was contracted by MWA to complete a site investigation, wetland delineation, topographic survey, and preliminary (60%) engineering design for dam removal. Preliminary plans were reviewed by Washington Township and the Town of Hackettstown. In 2023, Princeton Hydro completed the final engineering design, hydrologic and hydraulic modeling, and permitting for the removal of Beatty’s Mill Dam and restoration of the floodplain and provided engineering oversight during construction.
The removal of Beatty’s Mill Dam was officially completed the week of November 13, 2023!
Princeton Hydro assisted in the removal and restoration, providing engineering plans and project management support. With the dam removed, 2.5 acres of flood plain have been restored; 0.15 mile of stream bank have been stabilized; 0.15 mile of stream bed has been rehabilitated; and total suspended solids in the water have been reduced by 20%.
Michael Allers, Princeton Hydro Restoration Ecologist and licensed FAA-Certified Commercial Drone Pilot, captured these aerial images of the completed project site:
It is projected that there will be significant improvement to the five aforementioned functional values, increased fish passage, enhanced hydraulic conditions at the East Avenue bridge as well as improvements to the river’s pH, temperature, and dissolved oxygen levels.
Removing the dam also supports conformance with the Highlands Regional Master Plan, which is intended to protect, preserve, and enhance precious water resources within the Highlands Region. The project work also includes the restoration of the damaged floodplain, stream banks, and stream bed by planting trees, building up the banks with rocks, and allowing the river to return to its natural flowing channel.
This project’s significance extends beyond the immediate environmental impact. Funding from sources like the National Fish and Wildlife Foundation under the Delaware Watershed Conservation Fund and New Jersey’s Highlands Council, along with corporate contributions, underscores its potential to serve as a model for similar restoration projects across the Delaware River Watershed. Such initiatives not only enhance aquatic habitats but also bolster community resilience against flooding and elevate public awareness regarding watershed conservation.
The vision for this restoration effort reflects a collective commitment to revitalize river ecosystems, not just for the immediate region but as part of a broader strategy for conservation. The Beatty's Mill Dam marks the MWA's sixth dam removed on the Musconetcong River since 2008, but it is far from the last. This project aims to set a precedent for sustainable river management and ecosystem preservation.
The removal of Beatty's Mill Dam represents a milestone in the ongoing efforts to restore the Musconetcong River's ecological balance and underscores the collaborative spirit between MWA, local municipalities, various stakeholders, and Princeton Hydro. It serves as a testament to the potential of concerted conservation endeavors to restore the vitality of our waterways and safeguard the natural heritage for generations to come.
The Musconetcong Watershed Association (MWA) is an independent, nonprofit organization dedicated to protecting and improving the quality of the Musconetcong River and its watershed, including its natural and cultural resources. Members of the organization are part of a network of individuals, families, and companies that care about the Musconetcong River and its watershed, and are dedicated to improving the watershed resources through public education and awareness programs, river water quality monitoring, promotion of sustainable land management practices, and community involvement. Click here to learn more.
Princeton Hydro has been working with MWA in the areas of river restoration, dam removal, and engineering consulting since 2003. Click here to read our Client Spotlight blog featuring MWA’s Executive Director Cindy Joerger and Communications Coordinator Karen Doerfer.
On June 6, 2023, New Jersey Governor Philip Murphy announced the Administration’s upcoming adoption of the Inland Flood Protection Rule to better protect New Jersey’s communities from worsening riverine flooding and stormwater runoff. The rulemaking was filed with the Office of Administrative Law and was adopted, effective on July 17, 2023, after publication in the New Jersey Register. A courtesy copy of the rule and additional information are available here.
The Inland Flood Protection Rule updates New Jersey’s existing flood hazard and stormwater regulations by replacing outdated precipitation estimates with modern data that account for observed and projected increases in rainfall. These changes will help reduce flooding from stormwater runoff and increase the resilience of new developments located in flood-prone inland areas. Upon adoption, New Jersey will become the first state to use predictive precipitation modeling to implement rules to inform and protect future development and redevelopment from the impacts of climate change.
“The Inland Flood Protection Rule will serve as a critical component of my Administration’s comprehensive strategy to bolster our state’s resilience amid the worsening impacts of climate change,” said Governor Murphy. “As a national model for climate adaptation and mitigation, we can no longer afford to depend on 20th-century data to meet 21st-century challenges. This rule’s formation and upcoming adoption testify to our commitment to rely on the most up-to-date science and robust stakeholder engagement to inform our most crucial policy decisions.”
The Inland Flood Protection Rule establishes design elevations that are reflective of New Jersey’s changing climate and more frequent and intense rainfall, replacing standards based on outdated data and past conditions. The updated standards will apply to certain new and substantially reconstructed developments in inland riverine areas that are subject to flooding, but they do not prohibit development in these flood hazard areas.
Under the two primary components of the rule:
The updated standards in the Inland Flood Protection Rule will apply to new or reconstructed developments and not to existing developments. Pending development applications before NJDEP that are administratively complete at the time of adoption are not affected by these changes. Existing provisions of the flood hazard and stormwater rules that provide flexibility from strict compliance based on unique site-specific conditions will remain in place, along with new provisions designed to ensure that infrastructure projects already in progress can continue to move forward.
The final rule also provides clarifications for the legacy provision of the Flood Hazard Area Control Act rules at N.J.A.C. 7:13-2.1 to address projects that were wholly located outside the prior flood hazard area, and which have already received local approval under the Municipal Land Use Law. As initially proposed, this exemption from the new flood elevations would have been limited to those projects that had begun construction before the new rules were adopted. In recognition of the often-significant investments made for projects that have reached the stage of receiving municipal approval, NJDEP is retaining the existing exemption for such projects.
“New Jersey’s communities are facing unprecedented threats from the devastating impacts of extreme rainfall events, which are expected to continue to intensify in their frequency and severity,” said Commissioner of Environmental Protection Shawn M. LaTourette. “The Inland Flood Protection Rule ensures that inland, riverine areas at significant risk are better defined and that new and reconstructed assets in these areas are designed and constructed to protect New Jersey’s assets, economy and, above all, our people from the catastrophic effects of worsening floods. My DEP colleagues and I are truly grateful for Governor Murphy’s vision and leadership and for the thoughtful feedback we have received from the public and leaders in labor, business, local government, academia, and advocacy in designing this rule as part of the New Jersey Protecting Against Climate Threats (NJ PACT) initiative.”
In connection with the proposed Inland Flood Protection Rule, to aid the public to gauge flood risk and provide a visual approximation of regulatory jurisdiction on specific parcels, NJDEP has launched a flood indicator tool. While the tool does not provide a definitive demonstration of regulatory jurisdiction or calculate actual risk, it can be useful in assisting property owners or prospective property owners on potential risk and, by referencing the 500-year flood extent, approximate NJDEP’s regulatory jurisdiction and flood risk. Equipped with this information, property owners may then decide to take additional steps to determine actual risk, which is dependent on site-specific conditions.
The Watershed Institute’s Annual Conference brings together municipal representatives, engineers, environmental professionals, watershed advocates, business leaders, and community members to advance the best available information and techniques for protecting and restoring watersheds. The program consists of a keynote discussion, exhibits, poster sessions and presentations that combine science, policy, and practical applications.
This year’s conference, focused on stormwater management in New Jersey, Municipal Separate Storm Sewer System (MS4) permit requirements, regional solutions to address stormwater runoff and flooding, environmental justice, and the need for community-wide action.
Princeton Hydro, a proud sponsor of the conference, led two presentations:
This presentation, given by Princeton Hydro Senior Technical Director of Ecological Services Dr. Fred Lubnow and One Water Consulting, LLC Principal Jim Cosgrove P.E., provided a basic understanding of Total Maximum Daily Loads (TMDLs), how they’re connected to Watershed Implementation Plan (WIP) requirements, and addressed how towns can best utilize Waste Load Allocations in the development of a WIPs.
This presentation was led by three members of the Princeton Hydro team: Senior Technical Director of Engineering Dr. Clay Emerson P.E., CFM; Vice President, Founding Principal Mark Gallagher; and Senior Director of Ecological Services Dr. Fred Lubnow. Participants learned about how to develop regional, multi-municipality plans for improving water quality and reducing flooding.
Other presentation topics included, “Understanding Water Quality in New Jersey,” “Stormwater Utilities for Community Members,” and “Youth Advocacy – Engaging the Next Generation in MS4.” You can view all the presentations from the 6th Annual Conference by clicking below:
Princeton Hydro is recognized as a leader in innovative, cost-effective, and environmentally sound stormwater management green infrastructure. We've been incorporating green infrastructure into our engineering designs since before the term was regularly used in the stormwater lexicon. Click here to learn how we designed a green infrastructure stormwater management system, on a 55-acre corporate campus, that is capable of containing on site nearly all the stormwater runoff generated by storm events up to and including a 100-year frequency, 24-hour duration storm:
When New Jersey Manufacturers Insurance Group (NJM) developed their new Regional Operations Facility, a 55-acre corporate campus in Hammonton, New Jersey, they approached the construction with one major goal at the forefront: stormwater management.
Fundamental to that goal was designing a green infrastructure stormwater management system capable of containing on site nearly all the stormwater runoff generated by storm events up to and including a 100-year frequency, 24-hour duration storm.
The group hired Princeton Hydro, recognized as a leader in innovative, cost-effective, and environmentally sound stormwater management, to develop a concept plan that could be built within the context of proper stormwater management and meet the stringent requirements of the NJ Pinelands Comprehensive Management Plan.
To accomplish the ambitious stormwater management goals, the project team designed and implemented an integrated stormwater management system that combined traditional and green infrastructure components, and consisted of bioinfiltration basins, parking lot islands, a wetland basin, and a bioretention island. These features were designed to promote the interception, evapotranspiration, and infiltration of stormwater runoff at its source.
Emphasis was given to green infrastructure BMPs specifically capable of treating and infiltrating large volumes of runoff. Thus, all of the infiltration areas were designed using a soil amendment process where the underlying soils were excavated and amended with organic material to improve the underlying recharge capabilities of the soils. To complement the BMPs, the team designed and installed 120,000 gallon below-grade rainwater capture and reuse system. The system captures roof runoff to be used for on-site irrigation, which not only reduces stormwater volume but also decreases the facility’s water usage.
The project is one of the first projects in New Jersey built to infiltrate nearly 100% of the on-site runoff and uses site-design-based stormwater capacity to determine allowable impervious cover.
Before construction began, the team implemented a comprehensive study, which began with a detailed analysis of the site’s soils, with particular attention given to physical properties of the soil and the depth to seasonal high water (groundwater). During construction, Princeton Hydro provided monitoring services for all earthwork activities. Our team was on site full-time during critical activities to ensure that the project was built in accordance with the intent of the original design and ensure the maintenance of the project schedule. The team also provided environmental and geotechnical design and engineering services throughout the corporate campus construction, including the analysis of subsurface structures shop drawings and providing consultation support to the general contractor.
For the project, we partnered with Burgis Associates, Inc. who created site designs, provided landscape architectural and professional planning services, and helped to obtain agency approvals. The landscape program sought to establish native plant communities that filter runoff, provide an aesthetically pleasing visual, reduce invasive species, create habitat for pollinators and other critical species, and require limited maintenance to stay healthy and flourishing.
Post construction, the Princeton Hydro team led the preparation of the scope of services, budget, and proposal for the Stormwater Basin Maintenance, which included mowing and clearing the vegetation in nine infiltration basins. The basins were inspected monthly for functionality and for the presence of invasive plants. And, we are happy to report that the basins are all working properly and invasive plants have been eradicated.
At Princeton Hydro, we are experts in stormwater management; we recognize the numerous benefits of green infrastructure; and we’ve been incorporating green infrastructure into our engineering designs since before the term was regularly used in the stormwater lexicon. Click below to read about a Stormwater Treatment Train we designed and implemented in Thompson Park, a 675-acre recreation area in Middlesex County, New Jersey.
The New Jersey Department of Environmental Protection (NJDEP) launched a Youth Inclusion Initiative to help the State of New Jersey develop the next generation of environmental protection, conservation and stewardship leaders while also providing an avenue for young adults from open space-constrained communities to engage with nature as they provide valuable stewardship services to the public through jobs at NJDEP.
This year, the youth inclusion program is partnering with Groundwork Elizabeth, Rutgers University Camden, and Newark’s Ironbound Community Corporation to create a workforce development curriculum for people ages 17 to 24. Groundwork Elizabeth sent 12 participants to this year’s program, and Rutgers Camden and the Ironbound Community Corporation each sent 10.
The curriculum provides career education in the environmental protection field and helps the young participants develop the skills necessary to pursue those career paths in New Jersey. Participants learn through classroom instruction and by working across sectors regulated by the NJDEP, including water resources, air quality, energy and sustainability, public lands management, and wildlife.
Susan Lockwood of NJDEP’s Division of Land Resource Protection’s Mitigation Unit reached out to Princeton Hydro to showcase ecosystem restoration and mitigation efforts across the state as well as discuss the variety of career roles that make these projects possible. Our portion of the curriculum entailed each group of students visiting two sites to learn about the benefits of restoring a landscape with native vegetation. Our discussion explored different fields of work related to urban environmental restoration and water resource protection and the job responsibilities of environmental scientists, water resource engineers, geologists, ecologists, pesticide applicators, and regulatory compliance specialists.
After a quick stop at NJDEP’s office in Trenton to learn about NJ invasive species, all three groups popped over to the Tulpehaking Nature Center in Mercer County’s John A. Roebling Park to see the restoration site in the Abbott Marshlands. The 3,000-acre Abbott Marshlands is the northernmost freshwater tidal marsh on the Delaware River and contains valuable habitat for many rare species like River Otter, American Eel, Bald Eagle, and various species of wading birds. Unfortunately, the area has experienced a significant amount of loss and degradation, partially due to the introduction of the invasive Common Reed (Phragmites australis). For Mercer County Park Commission, Princeton Hydro implemented a restoration plan to remove Common Reed and expose the native seed bank in 40-acres of the marsh to increase biodiversity, improve recreational opportunities, and enhance visitor experience. Students learned how to tell the difference between the invasive Common Reed vs. native Wild Rice (Zizania palustris L.). They utilized tools of the trade like field guides and binoculars to identify flora and fauna in the marsh. Learn more about this project.
After visiting the Roebling site, students from Camden traveled down to Evesham Township in Burlington County to visit the Mullica River Wetland Mitigation Site. For this project, Princeton Hydro worked with GreenVest, LLC to restore a highly degraded 34-acre parcel of land which was previously used for cranberry cultivation. Through the implementation of restoration activities focused on removing the site’s agricultural infrastructure, Princeton Hydro and GreenVest were able to restore a natural wetland system on the site and over 1,600 linear feet of stream, providing forested, scrub-shrub, and emergent wetlands, forested uplands, headwater stream and riparian buffer, and critical wildlife habitat. The project also significantly uplifted threatened and endangered species habitats including Timber Rattlesnake.
Susan Lockwood of NJDEP, Owen McEnroe of GreenVest, and Dana Patterson of Princeton Hydro, lead the group of 10 students. They learned the difference between restoration and mitigation and got to experience the remoteness of Pinelands habitat. Walking through the site, we shared how the dam and dike removal helped to restore the river back to its natural free-flowing state and the numerous resulting environmental benefits.The site was chosen for the Camden students in order to demonstrate that successful mitigation and restoration projects happen throughout the State and not far from urban centers like Camden. Learn more about this project.
After visiting the Roebling site, students from Newark and Elizabeth trekked up to Essex County to visit an urban wetland creation project now known as Lion Gate Park. The once densely developed, abandoned Scientific Glass Factory in Bloomfield Township was transformed into a thriving public park with 4.2 acres of wetlands. Students heard the story of how this project came to be; decades of advocacy and litigation by community members and environmental nonprofits to stop redevelopment of the site into 148 townhomes. Bloomfield Township eventually secured the property to preserve as open space through a range of grants from NJDEP. Serving as the ecological engineer to Bloomfield Township, Princeton Hydro designed, permitted, and oversaw construction for the restoration project and is currently monitoring the site. The restoration work brought back to the land valuable ecological functions and natural floodplain connection, enhanced aquatic and wildlife habitat, and increased flood storage capacity for urban stormwater runoff. Learn more about this project.
The NJDEP Youth Inclusion Initiative began on July 5 with a week of orientation classes, and continued through August with classroom and in-field learning. The initiative culminates on August 26 with a graduation and NJDEP Career Day, during which students will have the opportunity to meet with and discuss career options with various organizations tabling at the event, including Princeton Hydro.
Click here to learn more about the NJDEP education program. If you’re interested in learning more about Princeton Hydro’s ecological restoration services, click here.
In October 2021, the largest stream restoration in Maryland was completed. Over 7 miles (41,000 linear feet) of Tinkers Creek and its tributaries were stabilized and restored.
The project was designed by Princeton Hydro for GV-Petro, a partnership between GreenVest and Petro Design Build Group. Working with Prince George’s County Department of the Environment and coordinating with the Maryland-National Capital Parks and Planning Commission, this full-delivery project was designed to meet the County’s Watershed Implementation Plan total maximum daily load (TMDL) requirements and its National Pollutant Discharge Elimination System Municipal Separate Storm Sewer System (MS4) Discharge Permit conditions.
Today, we are thrilled to report that the once highly urbanized watershed is flourishing and teeming with life:
We used nature-based design and bioengineering techniques like riparian zone planting and live staking to prevent erosion and restore wildlife habitat.
10,985 native trees and shrubs were planted in the riparian area, and 10,910 trees were planted as live stakes along the streambank.
For more information about the project visit GreenVest's website and check out our blog:
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