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196 a; a2 a1 40 39~ 38~ Greenda Browns Park NWR ~~ I ~'S 4~ V a 4sP UINTA vernal 1 .np ~ r ~~ Jense to rt Ouray Lake--11a ioerNW~ WMs~y ite artette uray II W Wetlands River 4 1 ~ , MIDDLE GREEN v 4~ BASIN I a ~ t RIVER BASIN ~ +ycP Oe1 t Lak~ W ~,~ >> W A ~~a C 1 ¢~J ~ ~~ i otGreen 1rRiver Cisco UTAH LAKE POWELL 1110 110 1090 loa° 0 1 I I t I O~ I Q 1 p 1 ~ I -- --1 I ~ I Py ~ WYOMING I Faaming G COLORADO EXPLANATION ~ NATIONAL WILDLIFE REFUGE (NWR) MANAGED BY U.S. FISH ANO WILDLIFE SERVICE OR WATERFOWL MANAGEMENT AREA (WMA) MANAGED BY UTAH DIVISION OF WILDLIFE RESOURCES O WETLANDS MANAGED BY U.S. BUREAU OF LAND MANAGE- MENT i °r8` " PART OF UPPER I Reurvov GREEN RIVER Flaming Gorge Dam DRAINAGE BASIN tlinta Mountains Browns Park WMA 0 ~ ~ ~ SO ~ 100 MILES ~ ~ ~ i ~ i 0 50 100 KILOMETERS stream in the Green River at a location commonly referred to as the "Razorback Bar." Tyus (1987) reported the presence of larval razorback suckers in the slack waters of the confluence of Ashley Creek and the Green River. Razorback suckers are almost exclusively found inquiet-water areas (Holden and Stal- naker 1975; McAda and Wydoski 1980). S. J. Hamilton and B. Waddell Fig. 1. The Green River and major tributaries, and location of national wildlife refuges, wa- terfowl management areas, and managed wet- lands within the middle Green River basin One sample of razorback sucker eggs collected in 1988 near Razorback Bar as part of the Department of the Interior's drain- water studies had 4.9 µg/g selenium dry weight (Peitz and Waddell 1991), whereas a second sample collected in 1991 near Razorback Bar had 28 µg/g selenium dry weight (B. Waddell, pers. comm., 1992).