A dam on the South Anna River pushed the alewife floater mussel to near-extinction in the waterway for nearly 200 years. But environmentalists say the mollusks have been returning since the dam's 2024 removal. Patrick Larsen, VPM News’ environment and energy reporter, learns how that could be a boon to the river’s overall health. Our award-winning work is made possible with your support. Visit vpm.org/givenow to support local journalism. #chesapeakebay #Ashland #vpmnews #publicmedia