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58 bridge 95-percent confidence interval abundance estimates bridge piers channel clubshell CM CM dive diver search downstream of bridge endangered species Epioblasma torulosa rangiana Fish and Wildlife Fowler Run FRESHWATER MUSSEL SURVEY freshwater-mussel gravel substrate INSTREAM Kinzua Dam mid-channel mussel bed mussel communities mussel population Mussel Survey Protocol MUSSEL SURVEY REPORT mussels were found O O OOOO Ohio River OOOOO Ortmann Paper pondshell Parmalee and Bogan Patricia Morrison PennDOT Pennsylvania Pleurobema clava Population estimate qualitative survey Quantitative Sample relative abundance rH O O O River at Foxburg river mile 86.2 river reach Sample Design sampling period scour area SCUBA SHELL DEPOSIT silt Silt deposited siltation species of freshwater specimen square meter stream velocity study reach transect two-stage design two-stage sample U.S. Fish U.S. Geological Survey upper Allegheny River upstream USGS Utterbackia imbecillis Velocities were measured water velocity Wildlife Service yards downstream