Fish Species of the Pelton Round Butte Hydroelectric Project Area Prepared for PGE by: Kenneth L. Witty S.P. Cramer & Associates, Inc. 300 S.E. Arrow Creek Lane Gresham, Oregon October 1999 TABLE OF CONTENTS INTRODUCTION ..........................................................................................................................1 Description of Project Area ................................................................................................1 Metolius River Basin ..........................................................................................................3 Deschutes River from Steelhead Falls to Lake Billy Chinook ...........................................3 Lower Crooked River (Bowman Dam to Lake Billy Chinook) ..........................................6 Lake Billy Chinook .............................................................................................................8 Lake Simtustus ....................................................................................................................8 Lower Deschutes River (Reregulating Dam to the Mouth) ..............................................10 Fish Species in the Project Area .......................................................................................12 CHINOOK SALMON ..................................................................................................................13 General ..............................................................................................................................13 Pelton Round Butte Project Area ......................................................................................22 SOCKEYE SALMON ..................................................................................................................27 General ..............................................................................................................................27 Pelton Round Butte Project Area ......................................................................................35 KOKANEE SALMON .................................................................................................................40 General ..............................................................................................................................40 Pelton Round Butte Project Area ......................................................................................43 STEELHEAD TROUT .................................................................................................................50 General ..............................................................................................................................50 Pelton Round Butte Project Area ......................................................................................56 RAINBOW TROUT .....................................................................................................................62 General ..............................................................................................................................62 Pelton Round Butte Project Area ......................................................................................68 PACIFIC LAMPREY ...................................................................................................................78 General ..............................................................................................................................78 Pelton Round Butte Project Area ......................................................................................81 BULL TROUT ..............................................................................................................................84 General ..............................................................................................................................84 Pelton Round Butte Project Area ......................................................................................90 Pelton Round Butte Hydroelectric Project i Fish Species of the Pelton Round Butte FERC No. 2030 Hydroelectric Project Area — October 1999 MOUNTAIN WHITEFISH ..........................................................................................................95 General ..............................................................................................................................95 Pelton Round Butte Project Area ......................................................................................97 SHORTHEAD SCULPIN ...........................................................................................................100 General ............................................................................................................................100 Pelton Round Butte Project Area ....................................................................................101 TORRENT SCULPIN ................................................................................................................104 General ............................................................................................................................104 Pelton Round Butte Project Area ....................................................................................106 SLIMY SCULPIN ......................................................................................................................108 General ............................................................................................................................108 Pelton Round Butte Project Area ....................................................................................110 MOTTLED SCULPIN ................................................................................................................112 General ............................................................................................................................112 Pelton Round Butte Project Area ....................................................................................114 PRICKLY SCULPIN ..................................................................................................................116 General ............................................................................................................................116 Pelton Round Butte Project Area ....................................................................................118 LONGNOSE DACE ...................................................................................................................120 General ............................................................................................................................120 Pelton Round Butte Project Area ....................................................................................122 SPECKLED DACE ....................................................................................................................124 General ............................................................................................................................124 Pelton Round Butte Project Area ....................................................................................126 LARGESCALE SUCKER ..........................................................................................................128 General ............................................................................................................................128 Pelton Round Butte Project Area ....................................................................................130 BRIDGELIP SUCKER ...............................................................................................................132 General ............................................................................................................................132 Pelton Round Butte Project Area ....................................................................................133 CHISELMOUTH ........................................................................................................................136 General ............................................................................................................................136 Pelton Round Butte Hydroelectric Project ii Fish Species of the Pelton Round Butte FERC No. 2030 Hydroelectric Project Area — October 1999 Pelton Round Butte Project Area ....................................................................................137 NORTHERN PIKEMINNOW ...................................................................................................140 General ............................................................................................................................140 Pelton Round Butte Project Area ....................................................................................142 REDSIDE SHINER ....................................................................................................................145 General ............................................................................................................................145 Pelton Round Butte Project Area ....................................................................................147 BROWN TROUT .......................................................................................................................150 General ............................................................................................................................150