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Dam Removal Boosts River Life in NJ
28 Oct
Summary
- Columbia Dam removal in 2019 revitalized the Paulins Kill River.
- Study shows return of eels, lampreys, and shad upstream.
- Water quality shows slight but measurable improvements.
The removal of the Columbia Dam in 2019 has prompted a notable recovery in New Jersey's Paulins Kill River ecosystem. A comprehensive study published in 2026 highlights the return of several migratory fish species to areas previously obstructed by the dam.
Researchers documented increased populations of juvenile American eels, adult sea lampreys, and American shad above the former dam site. This resurgence signifies that fish can once again access essential upstream habitats for breeding and feeding, which were inaccessible for decades.
The dam, originally built in the early 1900s for ice production and energy, had long impeded the natural flow of the river. Its demolition in 2019 aimed to restore ecological balance and improve passage for aquatic life.
Monitoring also revealed small but significant improvements in water quality. Water temperature saw a slight decrease of approximately 0.29 degrees Celsius, while dissolved oxygen levels increased by about 0.14 milligrams per liter. These changes, though subtle, are vital for aquatic organisms and overall river health.
While complete river restoration will take considerable time, the observed recovery of fish populations and water conditions offers a promising indication of the positive impact of dam removal on disrupted ecosystems.
