Recent scientific studies show that sediment backed up behind the Conowingo Dam is not as big a threat as previously thought. During a big storm, 80 percent of the sediment that comes through the dam is from upriver, while 20 percent is the mud scoured from the area behind the dam, according to the U.S. Army Corps of Engineers. What that means is the bigger threat to the Chesapeake Bay remains what it always has been: pollution that enters the Susquehanna River and all other tributaries from farms, cities and suburbs.
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