"On a hot summer day, it's hard to see how the Conowingo Dam could hurt the Chesapeake Bay. Anglers line the shore below the 94-foot high impoundment, casting out into the gently roiling Susquehanna River for rockfish breaking the water. Yet unseen, on the other side of the dam, millions upon millions of tons of sediment and nutrient pollution are slowly building up that could wreak havoc on the bay if they get through."
"'It's an invisible problem,' said Michael Helfrich, the Lower Susquehanna Riverkeeper, as he watches the fishermen. But to Helfrich, it represents the single largest threat in the region to the future health of the bay."