April 30, 2018 — Gov. Larry Hogan’s administration is requiring the owner of Conowingo Dam to find a way to trap pollution that flows down the Susquehanna River and into the Chesapeake, threatening progress in cleaning up the bay.

For decades, pollution has built up behind the Conowingo. But the dam is now at its capacity and no longer traps sediment and nutrient runoff from across Pennsylvania.

Maryland Environment Secretary Ben Grumbles said a set of “stringent environmental conditions” imposed Friday is part of a broader strategy to speed bay cleanup “and hold our partners accountable for doing their part to create a healthier watershed.”

Dam owner Exelon Corp. needs a water quality permit from Maryland to get a federal license to continue operating. The state issued the new permit with a requirement that Exelon develop a plan to continue trapping the same amount of pollution the Conowingo always has — millions of pounds of nitrogen and hundreds of thousands of pounds of phosphorus every year.

Sediment and nutrients like nitrogen and phosphorus degrade the Chesapeake ecosystem by clouding waters and blocking sunlight, and by fertilizing algae blooms that strip the water of oyxgen.

The permit also requires Exelon to more frequently collect floating trash and debris that builds up at the dam’s edge, potentially through a solar-powered trash wheel like one that has helped clean up Baltimore’s Inner Harbor in recent years.

Read the full story at the Baltimore Sun