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River herring are diadromous fish, which means they migrate between fresh and salt water. On Long Island in Nassau, New York, they migrate between Mill Pond Creek and the ocean, using Bellmore Creek as a highway. The river herring live much of their adult life in the ocean and travel to the freshwaters of Mill Pond Creek in order to spawn.
There is a dam located at the point where Bellmore Creek meets Mill Pond. When the water level isn’t high enough, the river herring can be blocked from swimming upstream to reach their spawning habitat. This not only has negative implications for river herring species, it also negatively impacts the entire ecosystem. The herring are a vital food source for countless other fish, birds and animals, and play a critical role in transferring marine derived nutrients into surrounding estuarine, freshwater and upland habitats.
River Herring have been documented at the base of the dam at Mill Pond for the past several migration seasons. Bellmore Creek is one of only two-dozen streams on Long Island where remnant runs of this ecologically valuable, diadromous fish still exist.
In 2018, Seatuck Environmental Association, a nonprofit dedicated to wildlife conservation on Long Island, was awarded the NYSDEC Division of Marine Resources Grant for Tributary Restoration and Resiliency to design a fish passage at the dam intersecting Mill Pond and Bellmore Creek. Seatuck contracted Princeton Hydro to design the fish passage options.
The project goals not only include increasing river herring spawning habitat, but also are focused on improving the ecological condition of Bellmore Creek, maintaining and enhancing recreational values, and improving site resiliency to climate change and sea level rise.
To provide guidance on the project, Seatuck assembled an advisory committee with representation from Nassau County (dam owner), New York State Office of Parks, NYS Department of Environmental Conservation, Nassau County Soil and Water District, Town of Hempstead, the South Shore Estuary Reserve, Trout Unlimited, The Nature Conservancy, South Shore Audubon, and the Bellmore Civic Association.
Princeton Hydro conducted a study to understand the feasibility of enhancing fish passage to Mill Pond. The initial site investigation, in November 2020, included sediment probing and sampling, and a thorough assessment of the existing dam, spillway, water pipes, bridges and upper reaches. 

[gallery ids="10580,10579,10581"]

 

Based on its findings, the Princeton Hydro team developed three design options to restore fish passage:

 	
A nature-like fishway, where a channel made of boulders and concrete is constructed through the dam to mimic a natural, steep stream;
 	
A technical fishway, where a pre-fabricated metal fish ladder is placed within the spillway to allow fish to swim up and into the pond; and
 	
A full or partial dam removal, where the spillway is fully or partially removed and the pond is restored to a free-flowing stream and wetland complex.

On June 8 2021, Seatuck, Nassau County and Princeton Hydro held a virtual meeting to get the public’s input on each of the fish passage designs. Emily Hall, Conservation Policy Advocate for Seatuck, also put together an informative presentation in which she provides a synopsis of Bellmore Creek's history, describes the project goals, and discusses the community engagement process and the results of the public opinion survey. Watch it now:
[embed]https://www.youtube.com/watch?v=CvdWsI_3MIU[/embed]
Additionally, Princeton Hydro completed a site investigation including topographic survey, sediment probing and sampling, and assessment of structures to identify project opportunities and site constraints. Sediment sampling and analysis indicated no major concerns with contamination. By performing analysis of the longitudinal profile, Princeton Hydro determined that the full dam removal (option 3 listed above) was not recommended due to the potential for initiating uncontrolled channel incision below the original river grade into Mill Pond and upstream reaches.
Ultimately, the technical fish ladder (option 2 listed above) was chosen as the most appropriate solution for restoring fish passage to Mill Pond and maintaining existing recreational values. Princeton Hydro is currently developing preliminary engineering design plans for this selected alternative as part of this phase of the project.
The focus on Bellmore Creek is just one of many projects included in Seatuck’s River Revival program, which has sought to clear similarly blocked waterways across Long Island. If you’re interested in learning more about Seatuck’s conservation work and getting involved, click here.
Princeton Hydro has designed, permitted, and overseen solutions for fish passage including the installation of technical and nature-like fishways and the removal of dozens of small and large dams throughout the Northeast. To learn more about our fish passage and dam removal engineering services, click here and check out our blog: Conservation Spotlight: Restoring Fish Passage on the Noroton River.
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Rivers are a critical natural resource and an essential element for the health and survival of billions of people and countless species. Flourishing populations of migratory fish are an important indicator of a healthy, coastally connected river and a robust aquatic ecosystem as a whole. Migratory fish help to maintain a balanced food web, support productive river systems, and provide income for people around the world.
Yet many migratory fish species are severely threatened primarily due to man-made obstacles like dams and weirs, which disrupt the natural flow of rivers and prevent fish migration. When fish can’t reach their habitat, they can’t reproduce and maintain their populations.

A new book, titled From Sea to Source 2.0, explores the challenges behind the restoration of fish migration in rivers around the world and provides a practical guide to promoting the protection and restoration of fish migration. The book is a unique collaboration of over 100 international fisheries professionals and supported by river managers, governments, research institutes, and NGOs including World Wildlife Fund and The Nature Conservancy. Geared toward practitioners, but also a wonderful resource for the general public, the book is comprised of inspiring stories from nearly every continent on the planet. Click here to download it for free.
“Ultimately our ambition is to contribute in a positive way to making a better world and a positive difference for migratory fish, nature and humans on local and global levels by inspiring new initiatives for and with people all around the world,” as stated on www.fromseatosource.com. “Whether the challenge is simply to increase access to spawning habitats through connectivity improvements for salmon, or to maintain the livelihoods for hundreds of millions of people dependent upon fish and fisheries in the great rivers of Asia, Africa, and South America, we hoped our book would help to achieve these goals.”
Princeton Hydro’s Dam Removal Expert Laura Wildman, P.E. and Fluvial Geomorphologist Paul Woodworth are proud contributors to the book, helping to write the dam removal chapter, creating a dam removal flow chart for the book, and providing multiple photos utilized in the book. Princeton Hydro is also listed as a contributing sponsor.
“We’re so proud to be part of this incredible project with so many partners globally," said Wildman. "We envision that this book will provide a valuable resource and inspiration for those in countries and regions where the importance of restoring riverine connectivity is newly gaining momentum. We hope it will help emphasize the importance of finding balanced and environmentally informed solutions when proposing additional utilization of public trust resources such as rivers.”
Approximately 40% of all fish species in the world reside in freshwater ecosystems, contributing economic and ecological benefits and value. It’s critical that we support efforts that aim to protect migratory fish species, reconnect rivers, sustain fish passage, and preserve free-flowing rivers by removing unnecessary dams, reconnecting floodplains, managing our water use, and managing hydropower for sustainable rivers.
Education and awareness building are key first steps in protecting rivers. From Sea to Source 2.0 seeks to inform, educate, and inspire those who want to know more about how to meet the challenges of restoring fish migration in rivers around the world.  The book is regarded as a crucial resource in the ongoing fight to protect and preserve the enormous value of our waterways.
Get your free copy here.

Princeton Hydro has designed, permitted, and overseen the reconstruction, repair, and removal of dozens of small and large dams in the Northeast. To learn more about our fish passage and dam removal engineering services, visit: bit.ly/DamBarrier.
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River herring are diadromous fish, which means they migrate between fresh and salt water. On Long Island in Nassau, New York, they migrate between Mill Pond Creek and the ocean, using Bellmore Creek as a highway. The river herring live much of their adult life in the ocean and travel to the freshwaters of Mill Pond Creek in order to spawn.
There is a dam located at the point where Bellmore Creek meets Mill Pond. When the water level isn’t high enough, the river herring can be blocked from swimming upstream to reach their spawning habitat. This not only has negative implications for river herring species, it also negatively impacts the entire ecosystem. The herring are a vital food source for countless other fish, birds and animals, and play a critical role in transferring marine derived nutrients into surrounding estuarine, freshwater and upland habitats.
River Herring have been documented at the base of the dam at Mill Pond for the past several migration seasons. Bellmore Creek is one of only two-dozen streams on Long Island where remnant runs of this ecologically valuable, diadromous fish still exist.
In 2018, Seatuck Environmental Association, a nonprofit dedicated to wildlife conservation on Long Island, was awarded the NYSDEC Division of Marine Resources Grant for Tributary Restoration and Resiliency to design a fish passage at the dam intersecting Mill Pond and Bellmore Creek. Seatuck contracted Princeton Hydro to design the fish passage options.
The project goals not only include increasing river herring spawning habitat, but also are focused on improving the ecological condition of Bellmore Creek, maintaining and enhancing recreational values, and improving site resiliency to climate change and sea level rise.
To provide guidance on the project, Seatuck assembled an advisory committee with representation from Nassau County (dam owner), New York State Office of Parks, NYS Department of Environmental Conservation, Nassau County Soil and Water District, Town of Hempstead, the South Shore Estuary Reserve, Trout Unlimited, The Nature Conservancy, South Shore Audubon, and the Bellmore Civic Association.
Princeton Hydro conducted a study to understand the feasibility of enhancing fish passage to Mill Pond. The initial site investigation, in November 2020, included sediment probing and sampling, and a thorough assessment of the existing dam, spillway, water pipes, bridges and upper reaches. 

[gallery ids="10580,10579,10581"]

 

Based on its findings, the Princeton Hydro team developed three design options to restore fish passage:

 	
A nature-like fishway, where a channel made of boulders and concrete is constructed through the dam to mimic a natural, steep stream;
 	
A technical fishway, where a pre-fabricated metal fish ladder is placed within the spillway to allow fish to swim up and into the pond; and
 	
A full or partial dam removal, where the spillway is fully or partially removed and the pond is restored to a free-flowing stream and wetland complex.

On June 8 2021, Seatuck, Nassau County and Princeton Hydro held a virtual meeting to get the public’s input on each of the fish passage designs. Emily Hall, Conservation Policy Advocate for Seatuck, also put together an informative presentation in which she provides a synopsis of Bellmore Creek's history, describes the project goals, and discusses the community engagement process and the results of the public opinion survey. Watch it now:
[embed]https://www.youtube.com/watch?v=CvdWsI_3MIU[/embed]
Additionally, Princeton Hydro completed a site investigation including topographic survey, sediment probing and sampling, and assessment of structures to identify project opportunities and site constraints. Sediment sampling and analysis indicated no major concerns with contamination. By performing analysis of the longitudinal profile, Princeton Hydro determined that the full dam removal (option 3 listed above) was not recommended due to the potential for initiating uncontrolled channel incision below the original river grade into Mill Pond and upstream reaches.
Ultimately, the technical fish ladder (option 2 listed above) was chosen as the most appropriate solution for restoring fish passage to Mill Pond and maintaining existing recreational values. Princeton Hydro is currently developing preliminary engineering design plans for this selected alternative as part of this phase of the project.
The focus on Bellmore Creek is just one of many projects included in Seatuck’s River Revival program, which has sought to clear similarly blocked waterways across Long Island. If you’re interested in learning more about Seatuck’s conservation work and getting involved, click here.
Princeton Hydro has designed, permitted, and overseen solutions for fish passage including the installation of technical and nature-like fishways and the removal of dozens of small and large dams throughout the Northeast. To learn more about our fish passage and dam removal engineering services, click here and check out our blog: Conservation Spotlight: Restoring Fish Passage on the Noroton River.
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