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Dr. Fred Lubnow, Princeton Hydro's Senior Technical Director of Ecological Services, and Jenn Rogers, Executive Director of Friends of Hopewell Valley Open Space (FoHVOS), were recently featured on the Native Plants, Healthy Planet podcast to discuss the collaborative, first‑of‑its‑kind initiative to monitor Harmful Algal Blooms (HABs) in the Delaware River Watershed using drones, spatial analysis, and community science.
The Delaware River is a lifeline for more than 14 million people, a refuge for wildlife, and a defining natural feature of the region. In recent years, HABs, once confined mostly to lakes and ponds, have expanded into streams and rivers and appearing in colder months. Understanding why this shift is happening, and how to predict it, is essential for protecting water quality, public health, and ecological resilience within the Delaware River watershed and watersheds nationwide.
The podcast, hosted by Fran Chismar and Tom Knezick of Pinelands Nursey, highlights the urgency of addressing HABs and the innovative, cross‑sector partnership driving this work forward. Listen now: Harmful Algal Blooms with Dr. Fred Lubnow and Jenn Rogers.




Stewardship and Community Leadership from FoHVOS
Jenn Rogers, Executive Director of FoHVOS, brings two decades of conservation leadership to the partnership. Her background spans naturalist education, ecological stewardship, and the development of large-scale restoration and public engagement programs. During her fourteen years with the Mercer County Park Commission, she helped establish both the Environmental Education and Stewardship Departments and oversaw the care of more than ten thousand acres of parkland.
Jenn has spent her career building programs that connect people to the landscapes around them. Her commitment to community-driven conservation make her a key partner in a project that relies on both scientific rigor and public participation. Her perspective highlights how land use, watershed health, and community stewardship are deeply interconnected.

Expertise Shaping the Future of HAB Research
Dr. Fred Lubnow serves as Princeton Hydro’s Senior Technical Director of Ecological Services and brings more than 30 years of experience in limnology, watershed restoration, and community and ecosystem ecology. His career has focused on understanding how freshwater systems respond to nutrient loading, hydrologic change, and long-term environmental pressures. He has designed and led numerous lake and watershed restoration projects, developed USEPA Nine-Element and TMDL-driven watershed plans, and created field-based cyanobacteria and cyanotoxin monitoring programs that are now used across the region.
Fred’s expertise in the taxonomy, ecology, and management of algae, particularly cyanobacteria, has made him a leading voice in the study of HABs. He currently serves on New Jersey’s HABs Advisory Team, where he helps interpret water quality data and advises on mitigation strategies. His scientific leadership guides the technical design and implementation of the Delaware River HAB monitoring initiative.




A Collaborative Approach to Understanding HABs
Now entering its second year, the Delaware River HAB monitoring initiative is expanding both its scientific scope and its community engagement efforts. Building on the foundation established in 2025, the project team is conducting multi‑season drone flights, enhanced satellite‑based surveys, and targeted on‑the‑water sampling along 73 miles of the Delaware River and 24 connected waterbodies. These efforts are designed to strengthen the project’s ability to detect and forecast HABs under a wide range of seasonal and environmental conditions.
[gallery link="none" columns="2" ids="19329,19330"]
Year two also introduces several tools and activities intended to support broader participation and more efficient data collection. This includes the launch of a new ArcSurvey123 mobile data platform to support real‑time volunteer water quality submissions, as well as expanded training opportunities for community members interested in assisting with field sampling. Data collected through these efforts will contribute to the development of advanced algorithms capable of forecasting HAB occurrence at multiple spatial scales.
Funded by the National Fish and Wildlife Foundation's (NFWF) Delaware Watershed Conservation Fund (DWCF), in partnership with U.S. Fish & Wildlife Service, the project continues to be supported by a diverse network of partners across New Jersey and Pennsylvania, including The City University of New York's (CUNY) New York City College of Technology (City Tech), Trenton Water Works, Mercer County Park Commission, The College of New Jersey, Aqua-PA, Philadelphia Water Department, Bucks County Conservation District, Turner Designs, and US Army Corps of Engineers - Philadelphia District's Blue Marsh Lake. Together, these organizations contribute technical expertise, watershed knowledge, and crucial on‑the‑ground support. This collaborative approach remains central to the initiative’s success and long‑term objective: establishing a scalable HAB‑forecasting framework that can ultimately be applied to additional watersheds across the United States.
For a deeper look at the research, partnerships, and shared commitment behind this initiative, listen to the full Native Plants, Healthy Planet podcast presented by Pinelands Nursery. Click here to learn more about the Pinelands Nursery and explore the full library of Native Plants, Healthy Planet podcasts. If you're interested in getting involved in the Delaware River HAB research initiative, the program is currently seeking volunteers for water sampling along the Delaware and select waterbodies. Contact FoHVOS Conservation Biologist Kaitlin Muccio at: kmuccio@fohvos.org for more details.
                    [post_title] => LISTEN: Native Plants, Healthy Planet Podcast Highlights HAB Science & Stewardship
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Friends of Hopewell Valley Open Space (FoHVOS), in partnership with Princeton Hydro, has launched a groundbreaking initiative, “Monitoring Harmful Algal Blooms (HABs) in the Delaware River Watershed Using Drones and Spatial Analysis,” to improve understanding and forecasting of HABs throughout the Delaware River Watershed. Funded by the National Fish and Wildlife Foundation (NFWF), in partnership with the U.S. Fish & Wildlife Service, through the Delaware Watershed Conservation Fund (DWCF), the project leverages drone technology and advanced data modeling to identify environmental conditions that contribute to HAB formation and aims to develop tools and methodologies for early detection and management.
For this innovative research project, FoHVOS, a 501(c)3 and accredited Land Trust located in Hopewell Township, NJ, has teamed with Princeton Hydro. Princeton Hydro conceptualized and designed the initiative and is leading the technical implementation, including field survey design, drone operations, data analysis, and volunteer training.
“The Delaware River is central to Hopewell Valley’s identity. It shapes our way of life, supplies drinking water to 14.2 million people, shelters wildlife like the endangered Atlantic sturgeon, and offers abundant outdoor recreation,” said Jennifer Rogers, Executive Director of FoHVOS. “HABs were once confined to ponds and lakes, but since 2018, they’ve appeared in colder months and spread to streams and rivers. Though land trusts traditionally focus on land, HABs show how land use directly affects water. These blooms often stem from excess nitrogen and phosphorus washed into waterways during storms. Protecting water means restoring land. Our partnership with Princeton Hydro aligns perfectly with our mission. Together, we’re working to better understand and safeguard the Delaware River and its tributaries in both NJ and PA.”
HABs, caused by nuisance growth of cyanobacteria, can have detrimental effects on water quality and are a growing environmental concern nationwide. These blooms deplete oxygen levels, release toxins, and disrupt ecosystems, potentially posing serious risks to drinking water supplies and the health of wildlife, pets, humans, and local economies. Despite advances in environmental monitoring, predicting when and where HABs will occur remains a challenge due to the complex interplay of nutrient loading, temperature, and hydrologic conditions that can lead to rapid bloom proliferation.
To address these challenges, this newly launched initiative integrates drone-based remote sensing, field sampling, and spatial data analysis to collect and interpret detailed environmental data over a two-year period. The study spans multiple monitoring sites along a 73-mile stretch of the Delaware River in New Jersey and Pennsylvania, focusing on near-shore sections and 23 associated waterbodies. The first survey event began in August 2025.


 
Drones equipped with multispectral imaging systems capture high-resolution spatial data that is then integrated with digital platforms to link remote-sensing with the drone data and on-the-water collected data. The field-based water quality measurements are being collected by a team of trained community volunteers who are using phycocyanin fluorometer meters to measure concentrations of the photosynthetic pigment phycocyanin, which is produced primarily by cyanobacteria. Volunteers enter the data into a customized ArcGIS mobile-friendly survey. These combined datasets will be used to develop and validate predictive algorithms for both planktonic and benthic HABs under varying seasonal and hydrologic conditions.
The following photos depict the RGB (Visual) and corresponding Thermal image from the monitoring flights over Spring Lake in New Jersey:
[gallery columns="2" link="none" size="medium" ids="18899,18900"]
“This research project represents a major step forward in how we study and manage harmful algal blooms at the watershed scale,” said Dr. Fred Lubnow, Project Lead and Senior Technical Director of Ecological Services at Princeton Hydro. “By integrating satellite data, drone imagery, and on-the-water sampling, we’re developing predictive tools that will enable us take a proactive approach to mitigate HABs, improve response time, and better support our ecosystem health.”
Project partners include New York City College of Technology – The City University of New York, which donated the drone and is supporting remote sensing and data integration; Trenton Water Works, Mercer County Park Commission, and The College of New Jersey which are providing monitoring sites and contributing volunteers for water quality data collection in New Jersey; Aqua-PA and the Philadelphia Water Department, which are providing monitoring sites and volunteers to collect watershed data in Pennsylvania; the Bucks County Conservation District, which is coordinating volunteer data collection; and Turner Designs, whose advanced phycocyanin sensors are being used to calibrate and validate drone-based monitoring data.
In the photos below, volunteers are being trained by Princeton Hydro staff on how to use phycocyanin fluorometers and Secchi disks to gather water quality data and log their findings.


[gallery link="none" size="medium" ids="18896,18895,18894,18897,18891,18892"]
This $1M project is funded through a $488,400 NFWF DWCF grant as part of the NFWF’s Research, Monitoring, & Evaluation Grant category and $513,700 in matching funds from project partners. This grant category aims to support high-performing science that is inclusive, adaptive, and innovative, with the potential to transform the Delaware River Watershed’s future through improved conservation, restoration, and public engagement.
Once complete, the project will produce a comprehensive report summarizing methods, analyses, and data-driven recommendations for practical, low-cost HAB monitoring and mitigation strategies that can be replicated across the Delaware River Watershed and beyond. Crucially, the report will identify tributaries and sources contributing to riverine HABs, enabling targeted restoration of the most affected lands and waters. Data collection will continue through Fall 2025, resume in Spring/Summer 2026, and culminate in a final report expected in 2027.


[gallery link="file" columns="2" ids="18781,18902"]
FoHVOS is a 501(c)3 nonprofit land trust dedicated to conserving the natural resources of the Hopewell Valley region and beyond. Through land preservation, ecological restoration, community engagement, and science-driven initiatives, FoHVOS works to protect and enhance open spaces for future generations. Learn more at www.fohvos.org.
Princeton Hydro is committed to improving our ecosystems, quality of life, and communities for the better. The firm was formed in 1998 with the specific mission of providing integrated ecological and engineering consulting services. Offering expertise in natural resource management, water resources engineering, geotechnical design and investigation, and regulatory compliance, their staff provide a full suite of environmental services throughout the Northeast for the public and private sectors. Project Lead, Dr. Fred Lubnow, is an expert in HAB management and has worked with dozens of lake associations and government agencies to restore lakes, manage watersheds, reduce pollutant loading, address invasive aquatic plants, and mitigate nuisance HABs. To learn more about Princeton Hydro's work to mitigate harmful algal blooms, go here.
                    [post_title] => Innovative Drone-Based Research Study to Predict HABs in the Delaware River Watershed
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Did you know that New York State is home to a rich tapestry of natural waterbodies, including over 7,600 freshwater lakes, ponds, and reservoirs? Our team recently journeyed to Lake George, New York, to participate in the 41st annual conference of the New York State Federation of Lake Associations (NYSFOLA).
This year’s conference, themed “It Takes a Community to Protect a Watershed,” brought together environmental experts, lake management professionals, students, recreation enthusiasts, watershed advocates, and lake community members to advance the best available information and techniques for protecting and restoring New York’s watersheds. The two-day program featured a diverse exhibitor hall, networking events, a silent auction, a student poster session and a variety of presentations and workshops that combined science, policy, practical applications, and tangible resources.
Princeton Hydro, a proud sponsor of the conference, led two presentations during the “Climate Resilience and Your Lake" segment of the educational program:
Michael Hartshorne, Director of Aquatics, delivered an insightful presentation titled "Impacts of Climate Change on Lake Ecology," which delved into the significant role of climate change in shaping lake ecosystems. During the session, Michael highlighted key factors such as rising water temperatures, heightened frequency and severity of rainfall, depletion of dissolved oxygen, fluctuating patterns of algal blooms, and the migration of invasive species due to changing latitudinal conditions. His presentation underscored the necessity for evolving approaches to lake management in response to these profound ecological shifts.
[gallery link="none" size="medium" columns="2" ids="14984,14982"]

Download the complete presentation now!


Dr. Fred Lubnow, Senior Technical Director of Ecological Services, presented "A Survey of the Ecology of Select Lakes and Ponds in Central Park, NYC," which provided an insightful overview of Princeton Hydro's water quality and ecological monitoring efforts conducted across lakes and ponds of Central Park from 2020 to 2023 for the Central Park Conservancy. These assessments revealed elevated nutrient levels driving planktonic algae, filamentous mat algae and in some cases high densities of aquatic plants, prompting the Central Park Conservancy and Princeton Hydro to collaborate on a tailored Management Plan. Fred’s presentation spotlighted the distinct ecological profiles of key sites, addressed the impact of cyanobacteria on both ecological dynamics and recreational usage, and provided practical management methods and techniques.
[gallery link="none" size="medium" columns="2" ids="14961,14983"]

Download the complete presentation now!


Additional educational session topics included, Environmental Justice and New York Lakes, Community Leadership for Healthy Lakes in New York State, and iMap Invasive Species Workshop. Click here to view the complete agenda.
Founded in 1983, NYSFOLA is a not-for-profit coalition of lake associations, individuals, and corporate members dedicated to the protection and restoration of New York lakes. Princeton Hydro is the industry leader in lake restoration and watershed management. We have conducted diagnostic studies and have developed management and restoration plans for over 300+ lakes and watersheds throughout the country. Our long-standing partnership with NYSFOLA as a corporate member, annual conference sponsor, and active participant highlights our unwavering commitment to collaborative initiatives aimed at safeguarding our water resources. To learn more about our lake and natural resource management services and how we're contributing to a healthier environment, click here. 
                    [post_title] => Insights from the NYSFOLA Conference: Presentations Available for Download
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We are thrilled to announce that Dr. Fred Lubnow, Senior Technical Director of Ecological Services at Princeton Hydro, has been honored with the prestigious Peter Homack Award by the American Water Resources Association, New Jersey Section (NJ-AWRA). The award was presented during NJ-AWRA’s annual meeting in December, recognizing Fred’s outstanding contributions to the multi-disciplinary understanding and management of New Jersey’s water resources.
The Peter Homack Award, established in 1987, commemorates the late Peter Homack, a former NJ-AWRA president and distinguished New Jersey engineer. The award celebrates individuals who exemplify Homack’s legacy of advancing water resource management through collaboration and innovation.
Fred’s selection for this honor is a testament to his decades-long dedication to the restoration and protection of water resources. Since Princeton Hydro’s founding in 1998, Fred has played a pivotal role in the study and restoration of hundreds of lakes across New Jersey and the Mid-Atlantic region. His work at Lake Hopatcong, in particular, stands as a shining example of his commitment. For over 30 years, Fred has partnered with Lake Hopatcong stakeholders to implement comprehensive restoration plans, develop best management practices, and achieve milestones toward the lake’s water quality goals.
Beyond his work at Princeton Hydro, Fred has enriched the field of water resource management through education and stewardship. He teaches watershed management at Delaware Valley University and freshwater ecology at Villanova University, inspiring the next generation of environmental stewards. Fred has contributed to NJ-ARWA over the last five years through a variety of presentations on harmful algal blooms (HABs) and watershed planning. Additionally, he has held leadership roles in the North American Lake Management Society (NALMS) and the Pennsylvania Lake Management Society. Selected as a member of the New Jersey Department of Environmental Protection’s HAB Expert Team, Fred has been instrumental in shaping the HAB advisory and alert systems we rely on today. His contributions have advanced our understanding of the factors driving cyanobacterial blooms in New Jersey’s lakes, offering valuable insights to improve the prediction, prevention, and management of these blooms.
Although Fred could not attend the award ceremony in person, he joined virtually via Zoom as his colleague Michael Hartshorne, Princeton Hydro’s Director of Aquatics, accepted the award on his behalf. During Michael's acceptance speech, he said:
“I’ve worked with Fred since I started at Princeton Hydro in 2006. He’s a humble leader, a dedicated mentor, and an overall fantastic person. Fred’s enthusiasm for lake ecology, particularly algae, is truly infectious. It’s a rare skill to make others genuinely excited about such a niche topic, but Fred has a remarkable way of doing just that. Fred truly embodies the spirit of the Peter Homack Award, and it’s an honor to receive this on his behalf.”
Fred’s passion, expertise, and collaborative spirit have left an indelible mark on water resource management in New Jersey and beyond. Princeton Hydro congratulates him on this well-deserved recognition and looks forward to his continued contributions to the field.
Earlier this year, Fred wrote a piece on "Preparing for Potential Harmful Algal Blooms: An Urgent Call to Action for NJ’s Lakes and Reservoirs." Click here to read it and learn more about his work to address the challenges posed by HABs and protect the integrity of our water bodies.

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                    [post_title] => Princeton Hydro’s Dr. Fred Lubnow Receives NJ-AWRA's Peter Homack Award
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The North American Lake Management Society (NALMS) held its 42nd Annual International Symposium from November 14–17 in Minneapolis, Minnesota. Water resource professionals, researchers, students and practitioners came together to share ideas and learn about managing and protecting lakes and their watersheds.
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This year’s conference, which was titled, “Leveraging Experience to Manage Diverse Lakes, Landscapes, and People,” featured an exhibitor hall, networking events, and a variety of presentations and workshops. Princeton Hydro, a proud contributing sponsor of the conference, led four presentations and one workshop; below, we provide a free download of each.




Princeton Hydro’s Senior Aquatic Ecologist and NALMS Board of Directors President Chris L. Mikolajczyk, CLM gave the following two presentations:


Click here to learn more and download the presentations.



Dr. Fred Lubnow, Senior Technical Director, Ecological Services for Princeton Hydro presented on “The Development of Site-Specific Harmful Algal Bloom (HABs) Management Plans.”


Click here to learn more and download the presentation.



Princeton Hydro Senior Aquatic Ecologist Paul Cooper led a presentation titled, “A 30-Year Assessment of Internal Phosphorus Loading, Nutrient Load Management, and Climate Change at Lake Hopatcong.”


Click here to learn more and download the presentation.


On the first day of the conference, Chris and Fred led a half-day workshop about developing Harmful Algal Blooms Management and Restoration Plans for Beaches and Marinas, which are designed as part of a larger, all-encompassing Watershed Implementation Plan. The workshop provided both in-lake, near-shore, and local watershed solutions to preserve water quality and protect the health of people and pets utilizing these waterbodies.


Click here to learn more and download the presentation.


A daring group of symposium participants bundled up and braved the cold temperatures for the Clean Lakes Classic 5k Run, which Princeton Hydro sponsored. The point-to-point course followed along the Mississippi River, through city greenways, and around snowy Minneapolis neighborhoods.
[gallery columns="4" ids="11943,11928,11927,14365"]


We’re also excited to announce that Chris L. Mikolajczyk won this year’s International Symposium photo contest for this stunning image he captured during a recent visit to Rocky Mountain National Park in Colorado. The photo is titled “Aquatic Plant Management: No Permits Needed!”


Congratulations, Chris!

. . .

Founded in 1980, NALMS is dedicated to forging partnerships among citizens, scientists, and professionals to foster the management and protection of lakes and reservoirs for today and tomorrow. For more information about NALMS and upcoming events, click here. To read about upcoming events that Princeton Hydro is participating in and sponsoring, click here.
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                    [post_content] => July is Lakes Appreciation Month! This national initiative was started in 1998 by the North American Lake Management Society (NALMS) as a way to draw attention to the value and importance of lakes and reservoirs, and encourage people to take action in appreciating and protecting our precious water resources.

We’ve put together four tips to help you celebrate:
1. Love Your Lake.

Whether you enjoy birding, photography, boating, paddle boarding or simply taking a leisurely stroll in nature, one of the best ways to celebrate your local lake is getting outside to enjoy your favorite lake-related outdoor activities. Check your local lake association calendar for upcoming community events. Invite a friend or family member out for a day of environmentally-friendly fishing. If you're in Pennsylvania, consider joining PALMS at Blue Marsh Lake for a community full moon paddle-out. If you photograph your adventures, share them on social media using the hashtag: #LakesAppreciation, and hopefully you’ll inspire others to show their lake appreciation too.




2. Join the Secchi Dip-In.

The “Secchi Dip-In” is an annual citizen science event where lake-goers and associations across North America use a simple Secchi disk to monitor the transparency or turbidity of their local waterway. Created and managed by NALMS, volunteers have been submitting information during the annual Dip-In since 1994. NALMS invites you to join this international effort to track changes in water quality! Get all the Dip-In details here. And, for detailed instructions for how to use a Secchi disk, check out our demonstration by Chris L. Mikolajczyk, CLM, Princeton Hydro Senior Manager, Aquatics.




3. Enter the NALMS Short Clips Video Contest.

NALMS is hosting a Lakes Appreciation Short Clips Video Contest. Create a 140-second video that best illustrates your love for lakes and inspires others to appreciate lakes too! Submit your clip to the NALMS Twitter feed (@NALMStweets) using the hashtag: #LakesAppreciation. A Twitter poll of the general public will be used to determine the winner. First place gets a $50 Visa gift card. The submission deadline is July 31, polling will run through the month of August, and the winner will be announced August 31, 2022. Click here for more details. And, to see the winning entries from a previous Lakes Appreciation photo contest, go here.




4. Learn About Lakes.
[embed]https://www.youtube.com/watch?v=xsJBSNZ26no[/embed]
You can support your favorite lake by educating yourself about how to monitor the condition of the lake, identify harmful algal blooms (HABs) and invasive species, and engage in activities that protect water quality and improve fish and wildlife habitat. Consider becoming a member of or volunteering for your lake or watershed association. Learn how to track and report HABs. And, take part in educational opportunities to learn about lake management, like our recent live Q&A session with Princeton Hydro's resident lake experts Dr. Fred Lubnow and Chris L. Mikolajczyk, CLM.



To learn about NALMS and get more ideas on how to celebrate your local lakes, click here.
If you’re interested in learning more about Princeton Hydro’s broad range of award-winning lake management services, click here. And, if you're interested in reading about our work to reduce HABs and increase biodiversity in Lake Latonka, click here.
                    [post_title] => July is Lakes Appreciation Month: Four Tips to Help You Celebrate
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The NJ Department of Environmental Protection (NJDEP) hosted its 3rd Annual Harmful Algal Bloom (HAB) Summit! The all-day, virtual seminar included expert presentations and facilitated open-forum discussions related to HAB science, monitoring, response, management, treatment and communication.

Approximately 220 people from around the country participated in the virtual summit, which was free and open to the public. The audience of stakeholders included government officials (local, state, federal); lake and other environmental commissions; watershed associations; environmental nonprofits; businesses; academics; lake management and HAB treatment experts; and folks interested in protecting their community lakes.
Participants heard presentations about “Keeping Your Pets Safe from HABs,” “The Benefit of Riparian Buffers;” and “Stormwater Management and the Use of Green Infrastructure.” Additionally, two members of the NJDEP HAB Expert Team - Dr. Fred Lubnow Director and Dr. Meiyin Wu - gave a presentation on best management practices to prevent, mitigate, and/or control HABs. The 10-person expert team was established as part of Governor Phil Murphy’s plan to enhance scientific expertise around water quality management and bolster the State’s response to HABs.
The Governor’s HABs Initiative was launched in 2019 after lakes throughout NJ (and the entire Continental U.S.) suffered from HAB outbreaks, which caused local and county health agencies to close off all beaches and issue advisories. These unprecedented conditions had significant negative impacts on lake-related ecological, recreational, and economic resources. The Governor’s initiative designated $13 million in funding to local communities for HABs reduction/prevention; established the aforementioned HABs expert team; and coordinated annual HABs summits in order to encourage continued community education and discussion.
If you were unable to attend the 2022 HAB Summit, NJDEP has made the complete morning and afternoon sessions available online:
Watch the Morning Session: 
[embed]https://www.youtube.com/watch?v=3KzeIP4FY60[/embed]



Watch the Afternoon Session: 
[embed]https://www.youtube.com/watch?v=vSfJXhcaPCo[/embed]

 
The NJDEP Division of Water Monitoring and Standards has an entire website dedicated to HABs. Click here to access educational fact sheets, stay informed on HAB alerts and advisories, and report a HAB sighting.
For more information about HABs, watch a live interview with Dr. Fred Lubnow on Jersey Matters during which he discusses what steps should be taken to prevent HABs:
[embed]https://youtu.be/BzesLJI2pLA?si=-S8AGu5e1ERnjTX6[/embed]

 

 
                    [post_title] => WATCH: NJDEP's 2022 Harmful Algal Bloom Virtual Summit
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The Princeton Hydro team is participating in and sponsoring a variety events focused on conserving, restoring, and protecting our precious water resources. In this edition of our Events Spotlight, we provide a snapshot of upcoming events this Fall and information on how to get involved:



 



October 5: "Facebook Live" Q&A with Princeton Hydro HAB Experts






Do you have questions about harmful algal blooms? Now is your chance to get answers! Join us on Tuesday, October 5 at 6:30 PM EDT for a "Facebook Live" conversation with two of Princeton Hydro's HAB experts, Dr. Fred Lubnow and Mike Hartshorne. Participants will get an overview of HABs and engage in a live Q&A session. You can submit a question by joining the live feed and typing in the comments. Get more info and register.



 



October 11-15: SAME MEGA Maryland - Small/Minority Business Conference for A/E/C

This year’s conference features a mix of in-person and virtual events,  including informative keynotes; local, State, and Federal agency panels; networking sessions; training workshops; webinars; and two special field trip activities. Princeton Hydro is honored to sponsor MEGA Maryland, which is seen as the premier event for the architecture, engineering, and construction industry. Our Director of Marketing, Dana Patterson, will be exhibiting at the in-person portion of the event. Get more info and register.




 



October 13: NJ Invasive Species Strike Team Professional Conference



Presented by the Friends of Hopewell Valley Open Space and hosted by Duke Farms, the 2021 Annual New Jersey Invasive Species Strike Team Conference will focus on the use of prescribed burning to combat invasive species. Princeton Hydro is sponsoring this event, which is being held outdoors under a tent. We look forward to seeing you there in October! Get more info and register. 

 





October 14: Linden Blue Acres Tour - Green Infrastructure & Floodplain Restoration



Join NJ-AWRA and Princeton Hydro for a tour of the Award-Winning Linden Blue Acres Green Infrastructure & Floodplain Restoration Project. This project set the precedent for enhancing ecological and floodplain function on flood-prone properties acquired by the NJDEP Blue Acres Program. This event is approved for one (1) credit hour of continuing education for Certified Floodplain Managers. Get more info and register. 
 

October 18: Fall 2021 Regional Lake Communities Symposium 



Western Connecticut State University presents its Fall 2021 Regional Lake Communities Symposium “Fall Science at Night Virtual Seminar Series." The seminar, titled “Threats to Our Lakes: Beyond Aquatic Invasive Plants,” welcomes members of the public, students, and scientists to participate in a variety of workshops focused on local lake conservation and management. Princeton Hydro’s Director of Aquatic Programs Dr. Fred Lubnow is presenting “The Lake Hopatcong (NJ) Story.” Get more info and register. 

 

October 19-20: 2021 Living Shorelines Tech Transfer Workshop
Join Restore America's Estuaries, American Littoral Society, NJDEP and the Chesapeake Bay and New Jersey field offices of the USFWS for the Living Shorelines & Nature - Based Methods Tech Transfer Workshop. The workshop, which is being held both virtually and in-person at the Grand Hotel in Cape May, NJ, features field trips to local restoration projects, workshops, networking events, and an exhibit hall. Princeton Hydro is a proud sponsor of the event and our Director of Marketing & Communications Dana Patterson is exhibiting! Please note: Attendees must provide confirmation of COVID-19 vaccination as part of registration. Get more info and register. 

 

October 19-22: ANJEC 2021 Environmental Congress



We are thrilled to sponsor the 48th Annual Environmental Congress, which is being held in an all-virtual Zoom format. Each day includes a variety of workshop sessions on topics like stormwater management, environmental justice advancement in New Jersey, and local climate action. The closing session on Friday includes entertainment by Musician Maxwell Kofi Donkor. Get more info and register. 

 



October 26: Colorado Lake & Reservoir Management Association Conference



Princeton Hydro’s Senior Project Manager and Senior Aquatic Ecologist Chris L. Mikolajczyk, CLM, is giving a Halloween-inspired presentation titled "In Celebration of All Hallows Eve: Reflections of a Study on One of the Spookiest Lakes in the U.S." This free, one-day conference will be held virtually and is open to he public. Get more info and register. 

 



October 26-28: NJ Association for Floodplain Management 16th Annual Conference



The 16th Annual Conference will be held at the Hard Rock Casino Hotel in Atlantic City. With more than 40 speakers lined-up, conference workshops will focus on a robust array of floodplain management topics, including flood hazard identification and mapping; flood hazard mitigation; technical assistance and training; and natural resource protection and enhancement. Princeton Hydro is happy to sponsor this event and our Director of Marketing, Dana Patterson, will be attending and exhibiting. Get more info and register. 
 

November 1-4 and 8-11: Coastal & Estuarine Research Federation Biennial Conference



The theme of the 26th Biennial CERF Conference is "CERF at 50: Celebrating Our Past, Charting Our Future." The virtual, eight-day conference aims to connect science and society in the collective goals of preserving coastal and estuarine habitats, resources, and heritage. The conference, which is expected to draw 1,300+ scientists and researchers from all over the world, includes a virtual exhibit hall, networking events, a film festival and a variety of workshops. Johnny Quispe, Princeton Hydro Natural Resources Project Manager, is presenting on November 3 at 10 AM as part of the session on "Transdisciplinary design and adaptation for sustainable, resilient urban coastlines: realizing triple-bottom line outcomes." His presentation features The South River Ecosystem Restoration & Flood Resiliency Enhancement Project. Get more info and register.


 
November 3-5: Fifth Annual Watershed Conference



The Watershed Institute’s 5th Annual Watershed Conference will be in a hybrid format with participants selecting socially distanced, in-person sessions at the Watershed Center and Reserve or choosing to attend virtually if they prefer. Princeton Hydro is sponsoring the event and leading two workshops. Our Director of Green Infrastructure and Stormwater Management, Dr. Clay Emerson, P.E., CFM, along with Kathy Hale, Principal Watershed Protection Specialist, NJ Water Supply Authority, is presenting on “Naturalizing Detention Basins.” And, Vice President Mark Gallagher, along with Patrick Ryan of the NJDEP, is presenting on "Understanding Permit Requirements for Conservation Activities." Get more info and register.

 
November 6-10: American Fisheries Society Annual Meeting 2021



Science professionals from throughout the world will come together for this hybrid-format event offering both virtual and in-person participation opportunities. This year's conference, themed “Investing in People, Habitat, and Science” includes scientific sessions, a poster hall, a tradeshow and exhibits, and a variety of Plenary Speakers. Princeton Hydro President Geoffrey Goll is presenting on, "Dam Removal in History, Current State of Removal, and Future Needs." Get more info and register. 
 




November 9-10: Northwest New Jersey Rivers Conference



The Northwest New Jersey Rivers Conference is coordinated by the New Jersey Highlands Coalition, with the support of partner organizations in the Highlands and Ridge & Valley regions of New Jersey. Together, these groups are collaborating to restore water quality under the four-state Delaware River Watershed Initiative. The 2021 Conference, held in an online-only format, will focus on three key themes, "Sustainability & Economic Development," "Land Use Planning & Conservation," and "Water Quality Monitoring & Management." The conference is free and open to the public, and includes a variety of presentations, workshops and a virtual exhibitor hall. Princeton Hydro is exhibiting.  Get more info and register. 





 
November 15-18: North American Lake Management Society 41st International Symposium



Princeton Hydro is sponsoring the NALMS 2021 International Symposium, which will be held virtually. The event consists of multiple panels and discussions focused on the value of water for economics, ecology, and culture. Senior Project Manager Christopher L. Mikolajczyk, CLM is giving a presentation titled "A Public-Private Approach to Lake and Watershed Management in the Highlands Region of New Jersey.” Our Director of Aquatic Resources, Dr. Fred Lubnow, is presenting on "Monitoring and Management of HABs in New Jersey Waterbodies From 2019 to 2021." Get more info and register. 

 
November 21: Camden Environmental Summit



This one-day virtual summit, hosted by the The Camden Collaborative Initiative, focuses on preserving the environment in the city of Camden. Princeton Hydro is proud to sponsor this event, which is free for Camden residents and students, and $25 for all other attendees. Get more info and register.

 
Stay Tuned for More! 









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Lake Hopatcong Commission partnered with Lake Hopatcong Foundation, with in-kind contributions from the NJDEP, municipal governments, Morris and Sussex Counties, Musconetcong Watershed Association, Lake Hopatcong Historical Museum, Rutgers University, NJ Highlands Council, and Princeton Hydro, to address three priority streambank stabilization projects within the Upper Musconetcong River Watershed.







The National Fish and Wildlife Foundation (NFWF) today announced that the Lake Hopatcong Commission would receive $480,650 through the Delaware Watershed Conservation Fund (DWCF). The DWCF aims to conserve and restore natural areas, corridors, and waterways on public and private lands to support native migratory and resident wildlife and fish, and native plants; and to contribute to the social health and economic vitality of the communities in the Delaware River watershed. Major funding for the DWCF is provided by the U.S. Fish and Wildlife Service.







“It’s great to see funding awarded to the Upper Musconetcong River Watershed at the federal level. The Commission was created to promote public health and welfare through the preservation of Lake Hopatcong for recreational and conservation purposes. These projects are consistent with our organizational goals and will enhance water quality and recreational access within the watershed,” said Ron Smith, Chairman of the Lake Hopatcong Commission.







The grant will fund the design and implementation of three streambank stabilization projects, identified as priority projects in the 2021 Upper Musconetcong River Watershed Implementation Plan as prepared by Princeton Hydro for the Lake Hopatcong Commission. They will address important stormwater issues that had been previously identified.  The projects are:





Musconetcong River Streambank Stabilization and Floodplain Enhancement in Hopatcong State Park (Roxbury Township). This portion of the Musconetcong River at Lake Hopatcong’s outlet has been identified as having serious stormwater and flooding issues. An approximate four-acre section of streambank will be restored and stabilized. As part of this effort, invasive species will be eradicated and the existing floodplain rehabilitated through the establishment of native vegetation.
Glen Brook Streambank Stabilization in Memorial Park (Borough of Mount Arlington). Glen Brook is a major stream entering Lake Hopatcong at Mount Arlington Beach. It is a significant source of stormwater runoff and has been identified as having a negative impact on water quality. Approximately 75 linear feet of Glen Brook immediately downstream of Memorial Pond will be regraded and vegetated to naturally treat runoff into the lake.
Lakefront Public Access & Regenerative Stormwater Conveyance at Witten Park (Borough of Hopatcong). Witten Park, a forgotten public area, will be restored and serious stormwater issues will be addressed. The severely eroded Sperry Spring, which feeds Lake Hopatcong, will be rehabilitated and a regenerative stormwater conveyance will be installed. This device will convey and treat stormwater runoff down a naturally occurring slope, reconnecting it to the original floodplain. 















“Environmental impacts associated with development pressure in the upper Musconetcong Watershed around Lake Hopatcong have contributed to reduced water quality. By implementing these projects, we will be able to continue our efforts to improve water quality by reducing phosphorus and sediment entering Lake Hopatcong and the Musconetcong River all while enhancing local wildlife habitat and increasing recreational access around New Jersey’s largest lake,” said Kyle Richter, Executive Director, Lake Hopatcong Foundation.







The grant application requested $480,650 from the DWCF with a combined local in-kind match of more than $489,000 from the Lake Hopatcong Commission, Lake Hopatcong Foundation, NJ Department of Environmental Protection, Borough of Hopatcong, Township of Roxbury, Mount Arlington Borough, Morris and Sussex Counties, the Musconetcong Watershed Association, Lake Hopatcong Historical Museum, Rutgers University, NJ Highlands Council, and Princeton Hydro. This is the first grant that has been awarded to the Lake Hopatcong Commission from NFWF.







“Lakes in the Upper Musconetcong Watershed, like Lake Hopatcong and Lake Musconetcong, have experienced degraded water quality and unprecedented harmful algal blooms from excessive nutrients in stormwater runoff and aging septic systems. We are proud to partner with Lake Hopatcong Commission, Lake Hopatcong Foundation, and local stakeholders on this multi-site stream stabilization project to reduce nutrient runoff, enhance wildlife habitat, and improve public access in the watershed,” said Dr. Fred Lubnow, Director of Aquatic Resources at Princeton Hydro.















To learn more about The Lake Hopatcong Commission, visit lakehopatcongcommission.org. To learn more about The Lake Hopatcong Foundation, visit lakehopatcongfoundation.org and check out our recent blog. To learn more about Princeton Hydro's natural resource management services, visit princetonhydro.com.

                    [post_title] => NFWF Awards $480,650 Grant For Streambank Stabilization Projects in the Upper Musconetcong River Watershed
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When monitoring and managing the health of a lake or pond, dissolved oxygen is one of the most important indicators of water quality. Dissolved oxygen refers to the level of free, non-compound oxygen present in water. It is an important parameter in assessing water quality because of its influence on the organisms living within a body of water; the vast majority of aquatic life needs sufficient amounts of oxygen dissolved in water in order to survive.
Pollutants, the decomposition of invasive aquatic weed growth, and algae blooms significantly reduce dissolved oxygen. The purpose of aeration in lake management is to increase the concentrations of dissolved oxygen in the water. Aeration systems achieve these water quality improvements by helping prevent stagnation of water, increasing circulation, disrupting thermal stratification which provides “through-column” mixing, and minimizes the occurrence of harmful algal blooms (HABs).
Princeton Hydro has been working with the Lake Hopatcong Commission and Lake Hopatcong Foundation to implement several projects aimed at reducing the impacts of HABs in Lake Hopatcong, including the installation of three innovative aeration systems in different areas of the lake. Funding for these projects have come from a NJ Department of Environmental Protection Water Quality Restoration HAB grant awarded to the Commission in 2020, with additional funding and support coming from the Foundation, Morris and Sussex Counties, and four municipalities that surround Lake Hopatcong.




Air Curtain Aeration System

Our team completed the installation of an air curtain system at Shore Hills Country Club in Roxbury Township in early November 2020. The system produces a wall of bubbles that provide the kinetic energy to push and deflect away floating cyanobacteria and other toxins trying to enter the waterway. Installed near the shoreline, the air curtain increases the movement of the water, making it more difficult for floating debris, pollutants, and HABs to accumulate near the shore and in nearby shallow water areas.




Nanobubble Aeration System

Nanobubbles are extremely small gas bubbles that have several unique physical properties that make them very different from normal bubbles. Nanobubble aerators directly saturate the water with significantly more oxygen than traditional water aeration systems. These systems produce ultra-fine bubbles that are nearly invisible to the human eye. Unlike “traditional” aeration systems that push air bubbles to the surface in order to circulate the water and increase the dissolved oxygen levels, nanobubbles are so small that they remain within the water column for an extended period of time, directly oxygenating the water. Our team is scheduled to complete a nanobubble system install for Lake Hopatcong in the Spring of 2021.




Nanobubble Aeration System with Ozone

At Lake Hopatcong’s Lake Forest Yacht Club in Jefferson Township, our team installed a Nanobubble System with Ozone, which was completed in November 2020. This system generates ultrafine microbubbles (nanobubbles) containing ozone, which is used to disinfect water supplies and works to break down organic material in the water. These nanobubbles harness the unique biocidal power of ozone and place it into a safe delivery mechanism that is highly effective but also ensures human and environmental safety. The resulting ozone nanobubbles eliminate a wide range of polluting chemicals as well as herbicides, pesticides, and microbial toxins, which are all known causes of HABs.
The nanobubble technology is a relatively new strategy for preventing cyanobacteria blooms. Evaluation of the air curtain and both nanobubble systems in controlling and minimizing HABs in Lake Hopatcong will begin in Spring 2021. Our team will closely monitor the effectiveness throughout the 2021 season and provide detailed reports of our findings. Stay tuned for more info!



Increasing the dissolved oxygen levels in a pond or lake provides many benefits including improved water quality, healthier fish and plants, more efficient filtration, and reduced nuisance algae growth. To learn more about Princeton Hydro's collaborative efforts to protect our valuable water resources, click here.
                    [post_title] => Preventing Harmful Algal Blooms with Innovative Aeration Technology
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Dr. Fred Lubnow, Princeton Hydro's Senior Technical Director of Ecological Services, and Jenn Rogers, Executive Director of Friends of Hopewell Valley Open Space (FoHVOS), were recently featured on the Native Plants, Healthy Planet podcast to discuss the collaborative, first‑of‑its‑kind initiative to monitor Harmful Algal Blooms (HABs) in the Delaware River Watershed using drones, spatial analysis, and community science.
The Delaware River is a lifeline for more than 14 million people, a refuge for wildlife, and a defining natural feature of the region. In recent years, HABs, once confined mostly to lakes and ponds, have expanded into streams and rivers and appearing in colder months. Understanding why this shift is happening, and how to predict it, is essential for protecting water quality, public health, and ecological resilience within the Delaware River watershed and watersheds nationwide.
The podcast, hosted by Fran Chismar and Tom Knezick of Pinelands Nursey, highlights the urgency of addressing HABs and the innovative, cross‑sector partnership driving this work forward. Listen now: Harmful Algal Blooms with Dr. Fred Lubnow and Jenn Rogers.




Stewardship and Community Leadership from FoHVOS
Jenn Rogers, Executive Director of FoHVOS, brings two decades of conservation leadership to the partnership. Her background spans naturalist education, ecological stewardship, and the development of large-scale restoration and public engagement programs. During her fourteen years with the Mercer County Park Commission, she helped establish both the Environmental Education and Stewardship Departments and oversaw the care of more than ten thousand acres of parkland.
Jenn has spent her career building programs that connect people to the landscapes around them. Her commitment to community-driven conservation make her a key partner in a project that relies on both scientific rigor and public participation. Her perspective highlights how land use, watershed health, and community stewardship are deeply interconnected.

Expertise Shaping the Future of HAB Research
Dr. Fred Lubnow serves as Princeton Hydro’s Senior Technical Director of Ecological Services and brings more than 30 years of experience in limnology, watershed restoration, and community and ecosystem ecology. His career has focused on understanding how freshwater systems respond to nutrient loading, hydrologic change, and long-term environmental pressures. He has designed and led numerous lake and watershed restoration projects, developed USEPA Nine-Element and TMDL-driven watershed plans, and created field-based cyanobacteria and cyanotoxin monitoring programs that are now used across the region.
Fred’s expertise in the taxonomy, ecology, and management of algae, particularly cyanobacteria, has made him a leading voice in the study of HABs. He currently serves on New Jersey’s HABs Advisory Team, where he helps interpret water quality data and advises on mitigation strategies. His scientific leadership guides the technical design and implementation of the Delaware River HAB monitoring initiative.




A Collaborative Approach to Understanding HABs
Now entering its second year, the Delaware River HAB monitoring initiative is expanding both its scientific scope and its community engagement efforts. Building on the foundation established in 2025, the project team is conducting multi‑season drone flights, enhanced satellite‑based surveys, and targeted on‑the‑water sampling along 73 miles of the Delaware River and 24 connected waterbodies. These efforts are designed to strengthen the project’s ability to detect and forecast HABs under a wide range of seasonal and environmental conditions.
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Year two also introduces several tools and activities intended to support broader participation and more efficient data collection. This includes the launch of a new ArcSurvey123 mobile data platform to support real‑time volunteer water quality submissions, as well as expanded training opportunities for community members interested in assisting with field sampling. Data collected through these efforts will contribute to the development of advanced algorithms capable of forecasting HAB occurrence at multiple spatial scales.
Funded by the National Fish and Wildlife Foundation's (NFWF) Delaware Watershed Conservation Fund (DWCF), in partnership with U.S. Fish & Wildlife Service, the project continues to be supported by a diverse network of partners across New Jersey and Pennsylvania, including The City University of New York's (CUNY) New York City College of Technology (City Tech), Trenton Water Works, Mercer County Park Commission, The College of New Jersey, Aqua-PA, Philadelphia Water Department, Bucks County Conservation District, Turner Designs, and US Army Corps of Engineers - Philadelphia District's Blue Marsh Lake. Together, these organizations contribute technical expertise, watershed knowledge, and crucial on‑the‑ground support. This collaborative approach remains central to the initiative’s success and long‑term objective: establishing a scalable HAB‑forecasting framework that can ultimately be applied to additional watersheds across the United States.
For a deeper look at the research, partnerships, and shared commitment behind this initiative, listen to the full Native Plants, Healthy Planet podcast presented by Pinelands Nursery. Click here to learn more about the Pinelands Nursery and explore the full library of Native Plants, Healthy Planet podcasts. If you're interested in getting involved in the Delaware River HAB research initiative, the program is currently seeking volunteers for water sampling along the Delaware and select waterbodies. Contact FoHVOS Conservation Biologist Kaitlin Muccio at: kmuccio@fohvos.org for more details.
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Tag: Dr. Fred Lubnow