Maine’s Penobscot River flows freely where the Veazie Dam once stood. Dam removals have reopened the river to 12 native fish species. Gregory Rec/Portland Portland Press Herald via Getty Images

When dams cause more problems than they solve, removing them can pay off for people and nature

Thousands of dams across the US are aging and overdue for maintenance. Taking them down can revive rivers, restore fish runs and create new opportunities for tourism and outdoor activities.

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