Removal of New Jersey's Columbia Dam in 2019 Restores Eel and Shad Migration
Columbia Dam in New Jersey was taken down in 2019 to let fish migrate naturally again. A nine-year monitoring study has now documented encouraging signs of recovery among fish populations, including American eels and adult American shad. Researchers tracked the river throughout this period to measure the dam removal's ecological effects. The study also recorded measurable improvements in water quality, with shifts in temperature and dissolved oxygen levels.
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