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adult agencies American Fisheries Society analysis aquatic assessment authors biological brown trout California Canyon changes channel Colorado River court Craig Creek curves decision depth determine discharge diversity downstream ecological economic editor effects eggs environmental equation estimates evaluation federal FERC Figure Fish and Wildlife habitat suitability hydraulic impact instream flow juvenile Kerr Dam Lake land manuscript mean measure ment microhabitat monitoring nonuse value North Anna River observed PHABSIM Physical Habitat pool population predicted rainbow trout range recreation regulation Research reservoir riffle riparian Roanoke River salmon sample simulation slimy sculpin smallmouth bass species stream streamflow survey Table tion transfer trip trout density types U.S. Fish U.S. Forest Service variables velocity Washington water quality Water Resources water rights water temperature wetlands Wildlife Service Yampa River