Ben Moyer: Low flows in Pennsylvania creeks show value of aquatic organism passage

There’s one upside to this summer’s extended dry weather and record heat in Pennsylvania. Shriveled creeks put a spotlight on the vital importance of aquatic organism passage within stream basins and watersheds.
As creeks withered, fish needed to move to places that still offered deeper, cooler, sheltered pools. Later, they’d need to redistribute, moving upstream or downstream back to familiar haunts. Some fish, in some streams, could do so. But many were likely marooned by drought and the inability to pass through a road culvert or pipe.

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