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Princeton Hydro was contracted by The Nature Conservancy to complete a feasibility study and design for the removal of the County Line Road Dam on the Paulins Kill in Northwestern New Jersey. This section of the Paulins Kill is an anabranching channel, with multiple stable channels and vegetated islands observed both above and below the dam. Wetlands are present on multiple islands within the river, as well as along the banks of the Paulins Kill. The run-of-the-river dam is approximately five (5) feet high and 350 feet long. The dam, which used to support agricultural activities, is now obsolete and its presence decreases the ecological function of the Paulins Kill. As such, the property owner is sought The Nature Conservancy’s assistance with removing the dam and restoring the river to a natural condition. This project is part of a larger effort by The Nature Conservancy to protect and restore the Paulins Kill Watershed through dam removal, floodplain restoration, land protection and other means.
Anticipated benefits of this project include restoration of a free-flowing river; reconnection of aquatic habitat for diadromous fish like American Shad and river herring; improved water quality; and restored ecosystem function (e.g., hydrology, sediment transport, nutrient processing). The project also includes a component to connect waterfront properties to the restored river.
To date, our team of scientists and engineers have completed the feasibility and design phases of this project. Tasks included surveys; field investigation; wetland delineation; geomorphic assessment; sediment sampling and analysis; hydrologic and hydraulic modeling; dam removal design; technical specifications; and regulatory compliance and permitting. Princeton Hydro conducted the exploration of various alternatives for fish passage (e.g., notching versus full removal) and fish passage analysis, which was a key step in the feasibility and design process.
As of January 2022, project partners are awaiting review of permit applications.
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