We’re committed to improving our ecosystems, quality of life, and communities for the better.
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Princeton Hydro worked with the United States Army Corps of Engineers (USACE) – New York District and the New York State Department of Environmental Conservation (NYSDEC) on the development of an acceptable monitoring program that was implemented in 2019. As stipulated in the NYSDEC-issued permit, the monitoring program had to follow the New York State Salt Marsh Restoration and Monitoring Guidelines (Guidelines) established in 2000. Working closely with USACE and NYSDEC and following the program specified within the Guidelines, Princeton Hydro established five transects and eighteen associated 1m2 quadrat locations along the five transects. Each transect represented a cross section of the various ecological communities present between Old Place Creek and the upper extent of the mitigation site. The ecological communities monitored across each transect included low marsh, high marsh, transitional zones between low marsh and high marsh, and scrub/shrub, respectively. [gallery link="none" columns="2" ids="19307,19305"] The following metrics were calculated within each 1m2 quadrat: overall percent cover and species composition comprising the observed percent cover. Within each 1m2 quadrat, a 0.25m2 portion of the quadrat was analyzed for stem density and plant height as outlined within the Guidelines. Additionally, the entire mitigation site was investigated for the presence of invasive species with subsequent mapping developed and incorporated into an adaptive management plan. This was then implemented to address the presence of common reed (Phragmites australis). Annual monitoring reports were prepared and submitted to both USACE and NYSDEC detailing the results of the monitoring effort with a focus on the established transects and 1m2 quadrats along each transect. A section of the reports was dedicated to the development of an adaptive management plan to ensure the mitigation site satisfied the requisite 85% vegetative cover comprised of desirable, native species. [post_title] => NYSDEC Wetland Monitoring - Old Place Creek Mitigation Site [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => nysdec-wetland-monitoring-old-place-creek-mitigation-site [to_ping] => [pinged] => [post_modified] => 2026-03-06 13:46:46 [post_modified_gmt] => 2026-03-06 13:46:46 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=19292 [menu_order] => 0 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) [1] => WP_Post Object ( [ID] => 18800 [post_author] => 1 [post_date] => 2025-12-02 20:22:29 [post_date_gmt] => 2025-12-02 20:22:29 [post_content] => The New Jersey Department of Military and Veteran Affairs (NJDMAVA) retained Princeton Hydro to implement ecological services at the Sea Girt National Guard Training Center in the Borough of Sea Girt, Monmouth County, New Jersey. To facilitate portions of the 2025-2029 Integrated Natural Resources Management Plan (INRMP), Princeton Hydro conducted a series of tasks such as delineating the extent of the northern and southern dune protection areas, where suitable habitat for the federally threatened, state endangered piping plover (Charadrius melodus) is present and confirming the extent of wetlands associated with a prior Letter of Interpretation. The project team also conducted an ecological assessment of the existing ecological communities with a focus on identifying the presence/extent/type of invasive species present to inform future targeted habitat management efforts identified within the INRMP and procured, on behalf of NJDMAVA, a Letter of Interpretation – Line Verification, Freshwater Wetlands General Permit 16 – Creation, restoration, and enhancement of habitat and water quality functions and values, and Coastal Zone Management General Permit 24 – Habitat creation, restoration, enhancement, and living shoreline activities. [gallery link="none" columns="2" size="large" ids="18801,18803"] [post_title] => Sea Girt Nation Guard Training Center Habitat Enhancement Project [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => sea-girt-nation-guard-training-center-habitat-enhancement-project [to_ping] => [pinged] => [post_modified] => 2025-12-08 21:44:33 [post_modified_gmt] => 2025-12-08 21:44:33 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=18800 [menu_order] => 0 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) [2] => WP_Post Object ( [ID] => 18610 [post_author] => 1 [post_date] => 2025-11-05 14:49:39 [post_date_gmt] => 2025-11-05 14:49:39 [post_content] => The Anchor QEA–Princeton Hydro team was selected by Audubon New York (and its partners Save the Sound and New York State Parks) to design the restoration and enhancement of an approximately 400-acre tidal marsh on the north-central coast of Long Island. The marsh has experienced restricted tidal flow since an earthen berm was breached in 2012 during Superstorm Sandy. The restricted tidal flow led to marsh degradation, which converted portions of the former salt marsh to brackish and freshwater marsh. The lack of tidal flushing also enabled invasive Phragmites australis to establish and spread within the marsh system. Design goals included:
The Goethals Bridge Replacement Project resulted in unavoidable impacts to 4.929 acres of wetlands and open water associated with the Arthur Kill, requiring the creation of 15.39 acres of mudflat, low marsh, high marsh, and scrub/shrub habitat; and preservation of 3.91 acres of existing low marsh/high marsh and open water habitat. Princeton Hydro worked with the United States Army Corps of Engineers (USACE) – New York District and the New York State Department of Environmental Conservation (NYSDEC) on the development of an acceptable monitoring program that was implemented in 2019. As stipulated in the NYSDEC-issued permit, the monitoring program had to follow the New York State Salt Marsh Restoration and Monitoring Guidelines (Guidelines) established in 2000. Working closely with USACE and NYSDEC and following the program specified within the Guidelines, Princeton Hydro established five transects and eighteen associated 1m2 quadrat locations along the five transects. Each transect represented a cross section of the various ecological communities present between Old Place Creek and the upper extent of the mitigation site. The ecological communities monitored across each transect included low marsh, high marsh, transitional zones between low marsh and high marsh, and scrub/shrub, respectively.
The following metrics were calculated within each 1m2 quadrat: overall percent cover and species composition comprising the observed percent cover. Within each 1m2 quadrat, a 0.25m2 portion of the quadrat was analyzed for stem density and plant height as outlined within the Guidelines. Additionally, the entire mitigation site was investigated for the presence of invasive species with subsequent mapping developed and incorporated into an adaptive management plan. This was then implemented to address the presence of common reed (Phragmites australis). Annual monitoring reports were prepared and submitted to both USACE and NYSDEC detailing the results of the monitoring effort with a focus on the established transects and 1m2 quadrats along each transect. A section of the reports was dedicated to the development of an adaptive management plan to ensure the mitigation site satisfied the requisite 85% vegetative cover comprised of desirable, native species.
The New Jersey Department of Military and Veteran Affairs (NJDMAVA) retained Princeton Hydro to implement ecological services at the Sea Girt National Guard Training Center in the Borough of Sea Girt, Monmouth County, New Jersey. To facilitate portions of the 2025-2029 Integrated Natural Resources Management Plan (INRMP), Princeton Hydro conducted a series of tasks such as delineating the extent of the northern and southern dune protection areas, where suitable habitat for the federally threatened, state endangered piping plover (Charadrius melodus) is present and confirming the extent of wetlands associated with a prior Letter of Interpretation.
The project team also conducted an ecological assessment of the existing ecological communities with a focus on identifying the presence/extent/type of invasive species present to inform future targeted habitat management efforts identified within the INRMP and procured, on behalf of NJDMAVA, a Letter of Interpretation – Line Verification, Freshwater Wetlands General Permit 16 – Creation, restoration, and enhancement of habitat and water quality functions and values, and Coastal Zone Management General Permit 24 – Habitat creation, restoration, enhancement, and living shoreline activities.
The Anchor QEA–Princeton Hydro team was selected by Audubon New York (and its partners Save the Sound and New York State Parks) to design the restoration and enhancement of an approximately 400-acre tidal marsh on the north-central coast of Long Island. The marsh has experienced restricted tidal flow since an earthen berm was breached in 2012 during Superstorm Sandy. The restricted tidal flow led to marsh degradation, which converted portions of the former salt marsh to brackish and freshwater marsh. The lack of tidal flushing also enabled invasive Phragmites australis to establish and spread within the marsh system.
The Anchor QEA–Princeton Hydro team developed 60% Designs, including design drawings, a cost estimate, a long-term management plan, and a QAPP. The project design includes dredging approximately 15,000 cubic yards of material from Sunken Meadow Creek and thin layer placement of dredged material onto adjacent marsh cells to develop low and high marsh footprints; treating approximately 20 acres of Phragmites australis and phased replanting the areas with native species; creating approximately 2,000 linear feet of channels in the marsh and improving approximately 8,500 linear feet of existing channels to enhance drainage and tidal flushing; creating tidal pools and installing anchored rootwads to promote habitat diversity; modifying existing culverts within the primary flow channel through the marsh; and planting within the high and low salt marsh footprints.
Along the Third River and Spring Brook, two freshwater tributaries of the Passaic River, a highly disturbed, flood-prone former industrial site, were transformed into a thriving public park allowing for both passive and active recreational activities. By removing a little over four acres of upland historic fill in this densely developed area and converting it into 4.2 acres of a functioning floodplain wetland, the project restored valuable ecological functions, enhances wetland and riparian zone habitat, and increases flood storage capacity for urban stormwater runoff.
Princeton Hydro served as the ecological engineer to Bloomfield Township. Our scientists and engineers played a crucial role in this important urban wetland creation project by assisting in obtaining grant acquisition, collecting background ecological data through field sampling and surveying, developing a water budget, completing all necessary permitting, designing both the conceptual and final restoration plans, and conducting construction oversight during implementation.
The site includes 1,360 feet along the east bank of the Third River and 3,040 feet along the banks of the Spring Brook. These waterways are freshwater tributaries of the Passaic River and share a history of flooding above the site’s 100-year floodplain. The Third River, like many urban streams, tends to be the victim of excessive volume and is subjected to erosion and chronic, uncontrolled flooding. This green infrastructure project re-established the natural floodplain wetland and riparian plant communities, which led to a species-rich forest community through the removal of invasive species, setting the stage for native plants.
Over 500 trees and shrubs were planted in the new wetland, with additional trees and shrubs planted along Lion Gate Drive and in existing woodlands. The selected native plant species all provide important wildlife value, such as providing fruit for migratory birds. Phase One of the project, which includes the wetland construction and plantings, was completed in April 2020. The sports fields and playground were completed in June 2021 and are now open to the public.
For this project’s design and construction, Bloomfield Township, Strauss and Associates, ARH, and Princeton Hydro secured $1.76 million in funding from the New Jersey Freshwater Wetlands Mitigation Council and several million more from NJDEP’s Office of Natural Resource Restoration. Acquisition of part of the property was funded by New Jersey Green Acres.
Over 40 years ago, Mercer County purchased 279 acres of flood-prone land along Miry Run as part of a restoration and flood mitigation initiative. In 2018, Mercer County Park Commission (MCPC) contracted Princeton Hydro and Simone Collins Landscape Architecture to develop the Miry Run Ponds Master Plan with three primary goals: (1) Provide passive recreation to complement other County activities; (2) Preserve and enhance the habitat, water quality, and natural systems that currently exist onsite; and (3) Provide linkage to adjacent trails and parks.
The team assessed the land area and proposed a concept plan to enhance the area and create recreational lake activities. Applying expertise in science-based assessment and evaluations, we performed:
Our project team facilitated focus groups with local municipalities, residents, interest groups, and County stakeholders to seek their input and report on site evaluation findings. In partnership with the County, we held public meetings to gather feedback on the conceptual site designs. This helped to inform the park planning process and determine how best to manage the site to meet the needs of the community and future generations.
The final Miry Run Pond Master Plan goes above and beyond the original vision, proposing considerable improvements to the area prioritizing valuable natural features, including 34 acres of reforestation, 64 acres of new meadows, 19 acres of vernal pools, and 7.9 miles of walking trails. It serves as a long-term vision and will be implemented over multiple phases. Dredging of the lake began in 2023.
Princeton Hydro was contracted by the American Littoral Society to complete design plans, permits and construction services for multiple water quality improvement projects conducted within Ocean County Park. The restoration and wetland pocket creation portion of the project is specific to work conducted during the summer of 2017 adjacent to Duck Pond, the second of three interconnected ponds located within the park. The overall purpose of the Duck Pond project was to reduce the non-point source loading of nitrogen and phosphorous. The reduction of nitrogen and phosphorus loading is a key element of the satisfying the Metedeconk River TMDL and addressing the causes for the eutrophication of Barnegat Bay.
Along 140 feet of shoreline an existing bulkhead running along the entire perimeter of Duck Pond was removed. It was graded back in a way to create two small wetland pockets designed to receive spill over from the pond during moderate to large storm events as well as treat existing runoff from the park during smaller storm events that would otherwise discharge directly into the pond. These wetland pockets were also graded to create non-uniform microtopography for increased ecological benefit. The plant palette chosen strikes a balance between aesthetic design and water quality improvement. Princeton Hydro worked collaboratively with NJDEP to reduce the permitting burden on our project partners. Due to the intent of the project to improve water quality, we presented an alternative permitting strategy agreed upon by NJDEP, which allowed the permitting of the project via the FHA Control Act Rules. This approach removed the need for CAFRA permitting and reduced permit preparation costs, review time, and fees, ultimately resulting in excess funding being directed towards implementation.
Following the project, in-stream in-situ and discrete water quality monitoring was conducted for one year in order to assess the effectiveness of the BMPs. The combined green infrastructure and living shoreline elements of this project set the stage for a much needed effort to reduce NPS loading and address waterfowl-related pathogen impacts to Ocean County Park’s lakes and the Metedeconk River. It heightened public awareness of NPS pollution and the benefits of green infrastructure. The project serves as a model for proper stormwater management and living shoreline creation throughout both the Metedeconk River and Barnegat Bay Watersheds.
Mercer County’s John A. Roebling Memorial Park offers residents in the surrounding area a freshwater marsh with river fishing, kayaking, hiking, and wildlife-watching. The park contains the northernmost freshwater tidal marsh on the Delaware River, Abbott Marshland. Tidal marshes, like the 3,000-acre Abbott Marshlands, contain valuable habitat for many rare species like River Otter, American Eel, Bald Eagle, and many species of wading birds. Unfortunately, the Abbott Marshland has experienced a significant amount of loss and degradation, partially due to the introduction of the invasive Phragmites australis (Phragmites).
For the Mercer County Park Commission (MCPC), Princeton Hydro put together a plan to reduce and control the Phragmites to increase biodiversity, improve water quality, broaden recreational opportunities, and enhance the visitor experience at the park. This stewardship project replaced the Phragmites with native species with a goal to reduce its ability to recolonize the marsh. Once the restoration was completed, these areas gave way to native flora, enhanced tidal function, and incredible viewscapes. Princeton Hydro also conducted a Floristic Quality Assessment to identify invasive areas and an Evaluation of Planned Wetlands to identify key wetland functions/values to be enhanced/restored, as well as performed hydrologic monitoring to understand tidal stage elevations.
Phase 1 of the restoration process included multiple herbicide applications in Spring and Fall to eradicate the Phragmites. We led the permit application process, which included securing a Flood Hazard Area (FHA) General Permit #4, Freshwater Wetlands (FWW) General Permit #16, and Coastal (CZM) General Permit #24. Our field operations crew applied the herbicide Imazapyr using our amphibious Marsh Master vehicle and airboat as well as on foot with a backpack sprayer. Following herbicide treatment, the Marsh Master was be equipped with a steel lawn roller with a welded angle iron to roll over and crush/snap the common reed stalks. The stalks would be rolled in opposite directions to break and mulch the stalks and expose the native seedbank. One year later, we documented a dozen “volunteer” native species growing in the marsh. During the project, Princeton Hydro worked alongside MCPC to keep the public informed and engaged through public meetings and outreach. MCPC launched the “Capture the Change” initiative to help document the visual changes seen in the park as the restoration progresses by sharing photos on social media using #BagthePhrag.
Keen Road, a local, rural roadway in East Vincent Township is scheduled to be repaved in 2025. There are four culverts under Keen Road that are in poor condition and need to be replaced, with one of them containing an active stream traveling through it. There are erosion issues and safety issues with culverts on both sides of the road, with erosion beginning to undermine the road itself.
Princeton Hydro was contracted by East Vincent Township to develop construction plans to replace the culverts and address the safety and erosion issues before Keen Road is repaved later in 2025. Princeton Hydro had the project area surveyed and used public LiDAR data to build a watershed model to calculate the flow through each of the culverts to determine if they were sized correctly. Without any record drawings of these culverts, Princeton Hydro had to work from scratch to understand how the system currently works and if there would be any ways to improve the performance of the system. Princeton Hydro also coordinated with local and state permitting agencies to attain the necessary permits to install the new culverts.
At the request of the local residents, Princeton proposed to modify the existing layout of the culverts to eliminate the need for two guide rail structures. Princeton Hydro also designed a series of grade control structures along the eastern upstream side of the project area to eliminate the source of the erosion and provide erosion protection along the roadway to stop the undermining of the road. The grade control structures reduce the velocity of the runoff to reduce erosion while also providing armor to provide further protection against erosion. Finally, erosion control measures such as a rip rap apron were designed at the discharge to provide protection from erosion on the downstream side of Keen Road.
The project was put out to bid in November 2024 and is scheduled for construction this Spring 2025.
Liberty State Park is located on the west bank of Upper New York Bay and is one of the most visited state parks in the nation with over 5.1 million visitors in 2018. Princeton Hydro was contracted to design a resilient coastal ecosystem within 235 acres of this highly urbanized setting that provides both ecological and social benefits. This includes the restoration of over 80 acres of tidal and non-tidal wetlands and creation of several thousands of feet of intertidal shoreline and shallow water habitat hydrologically connected to the Upper New York Bay.
Historically, the site contained intertidal mudflats and shallow water habitat, which were filled and developed as a railroad yard. Once constructed, this project will expand public access, improve water quality, restore native plant communities, and improve coastal resiliency for urban communities that are vulnerable to storm events. The site design includes a trail network for the park interior that will provide access to the newly established habitat zones and views of the Statue of Liberty and New York City skyline. This trail network will enhance pedestrian connectivity between the existing portion of Liberty State Park, Liberty Science Center, Jersey City, and local public transit hubs.
To inform the design development, our team conducted design charrettes with various stakeholders and a myriad of monitoring tasks focused on site characterization including a wetland delineation; bio-benchmarking surveys of the tidal marsh vegetation communities; topographic, bathymetric, and utility surveys; and geotechnical sampling such as SPT borings and test pits. Field data and observations were incorporated into various analyses to support the engineering design including a 2D Hydrologic and Hydraulic model and wave analysis, and a detailed Sea Level Rise Analysis to inform the design of various project elements to accommodate sea level rise projections through 2070. The tidal channel geometry, culvert width, and tidal marsh were designed to address increased flows and water surface elevations. Groundwater levels and flow direction were also characterized through the installation of monitoring wells and continuous measurements of the groundwater level using piezometers.
To support the design process, the team developed interim construction cost estimates for various design milestones and coordinated and advanced the local, state, and federal permit process and applications. As part of NJDEP’s public outreach campaign, our team participated in an open house interacting directly with members of the public. We produced a 4-minute video simulating the expected visitor experience using detailed engineering design renderings. When completed, this will be one of the largest ecosystem habitat restoration projects in New Jersey. Click below to watch the video now:
The Spring Creek (North) Ecosystem Restoration Project is located in the boroughs of Brooklyn and Queens, New York. In the early 1900’s, the salt marsh community of Spring Creek was part of the extensive coastal wetland community of Jamaica Bay, known for the abundance and diversity of its shellfish as well as its ecological importance as a nursery and feeding ground for countless species of birds and fish. The intertidal salt marsh and uplands have since been degraded by historic placement of dredged spoils and municipal waste, the construction of a sanitary sewer trunk line, ditching of the marsh, and urbanization of the watershed.
When completed, the project will restore approximately 43.2 acres of degraded habitat to 0.7 acres of low marsh, 12.9 acres of transitional and high marsh, 5.2 acres of scrub shrub wetland and 24.4 acres of maritime upland in an overall project footprint of 67 acres. Primary construction activities will include excavating and re-contouring uplands to intertidal elevations, thin layer placement of sand on the marsh platform to restore areas of degraded tidal wetland, removing invasive plant species, and replanting with native plant species. The overall project purpose is to improve the environmental quality (water, diversity, and wildlife habitat) of Spring Creek and its associated salt marshes as part of the overall Jamaica Bay Ecosystem.
Princeton Hydro was contracted by the US Army Corps of Engineers, New York District to lead the design and engineering. To inform the design development, a variety of site-specific data was collected including topographic, bathymetric, utility and tree surveys. Wetland delineation and vegetation characterization were performed, along with a bio-benchmark survey to establish marsh habitat boundaries; hydrodynamic data; and geotechnical borings. The data collected was analyzed and incorporated into the design, including a sea level change analysis; slope stability analysis; development of a hydrologic model and an unsteady 1-D hydraulic model; stormwater design; and wetland restoration design.
A concept design was developed in coordination with the US Army Corps of Engineers and New York City Parks, and the design was advanced via the preparation of 30%, 60%, 90%, and 100% design plans and technical specifications. Additionally, the required local, state, and federal permits were obtained, and a detailed construction cost estimate was developed.
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