Environmental Science

As another surge of stormwater and pollution flows through Conowingo Dam, scientists worry about impact on oysters, grasses

As another surge of stormwater and pollution flows through Conowingo Dam, scientists worry about impact on oysters, grasses

A surge of stormwater and pollution from Pennsylvania and New York was flowing into the Chesapeake Bay through the Conowingo Dam again Thursday, raising concerns that the relentlessly rainy summer could threaten oyster reproduction and throw off bay ecology for some time to come.

Even as scientists were assessing the environmental impact from recent storms, rising Susquehanna River waters were prompting dam operator Exelon Corp. to open Conowingo floodgates for the second time in three weeks, sending a deluge of muddy brown waters into the upper Chesapeake.

As much as 8 inches of rain fell across north-central Pennsylvania in recent days.

“The water right now really...

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