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<br />::c <br />=: <br />? <br />("r1 <br />t'"l <br />~ <br />~ <br />'" <br />,.. <br /> <br />Date <br /> <br />Evt;Dl <br /> <br />1951 <br /> <br />Davis Dam closed fonning Lake Mohave. <br /> <br />1950s-60s Late 19505 to early I 96Os, the San Juan River and its tributaries had 10-400 ~g/L selenium (Scott and Voegeli, 1961). <br /> <br />~ <br />~ <br />~ <br />? <br />Z <br />!' <br />9" <br /> <br />fish (Kidd, 1977; McAda, 1977). <br /> <br />f <br />e- <br />9. <br />o <br />..., <br />i- <br />S <br />::I. <br />g. <br />Sl <br />II <br />a <br />a- <br />s <br />tIl <br />!!. <br />e. <br />i <br /> <br />1954 Fish die-otIs at Sweitzer Lake, CO, in Gunnison River Valley (Barnhart, 1957). <br /> <br />1956 Fish die-otIs at Sweitzer Lake due to selenium in food chain (Barnhart, 1957). <br /> <br />1962 Flaming Gorge Dam closed forming Flaming Gorge Reservoir on Green River . <br /> <br />1967 Humpback chub and Colorado pikeminnow listed as endangered (001, 1967). <br /> <br />.- <br /><a <br />:g <br /> <br />1971 Endangered fish absence from Dolores River (Holden and Stalnaker, 1975). <br /> <br />1972-73 Elevated selenium found in fish from five sites in Colorado River basin as part of the National Pesticide Monitoring <br /> <br />Program (Walsh el al., 1977). <br /> <br />1974-77 Razorback sucker found at Walter Walker State Wildlife Area (WWSWA) and Clifton Pond in Grand Valley - all are old <br /> <br />1976-77 Selenium elevated in water, aquatic invertebrates, and fish from several sites in the Gunnison and Grand valleys (Birkner, <br /> <br />1978). <br /> <br />- <br />- <br />Ut <br />-oJ <br />