Heavy equipment removes the Columbia Lake Dam on the Paulins Kill River.
Columbia Lake Dam Heavy equipment removes the Columbia Lake Dam on the Paulins Kill River. © Columbia Lake Dam Removal Volunteer Drone Team


De-constructive Conservation

The Columbia Lake Dam was built on the Paulins Kill River in New Jersey in 1909 for ice harvesting and generating power for local communities. But it cut off the river’s water flow, preventing migratory fish like American shad from reaching their spawning habitat. Over time, sediment accumulated in the lake that formed behind the dam, choking fish and depleting food sources for birds and other wildlife. So after more than a century, The Nature Conservancy and a multitude of partners deconstructed the dam during the summer and fall of 2018. 

Former site of the Columbia Lake Dam
Map of the Former Dam Site Less than a mile from the site, the Paulins Kill River flows into the Delaware River, which provides drinking water to 17 million people. © TNC

Now, the Paulins Kill flows more freely, and 32 acres that were underwater serve as floodplain for the river. According to Beth Styler Barry, TNC’s river restoration manager in New Jersey, native plant seeds that had been buried underwater for years began to sprout only days after the lake drained. Bald eagles, blue herons, kingfishers and other wildlife are returning. “The river has not forgotten what to do,” says Beth. “All we had to do was get out of its way.”


Sketch of solar panels
Solar Panels Sketch of solar panels © Shutterstock

What's Next?

About 200 homes were powered by the dam, so TNC worked with partners to design solar panels that could be installed over a nearby trout hatchery to serve those residents. And the trout would benefit too: the solar panels could protect young fish that have struggled from a disease spread by predatory birds.