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Table 4. Annual step trends for sites affected by major interventions in the Upper Colorado River Basin <br />[mg1L, milligrams per liter; HS, highly significant (p 5 0.01); S, significant (0.01 < p S 0.05); MS, marginally significant (0.05 < p 0.10); - -, not significant (p > 0.10)] <br /> <br />Site <br />(table <br />3, <br />plate <br />1) <br /> <br /> <br /> <br />rincipal intervention Preinter- <br />vention <br />period <br />of record <br />(water <br />years) Postinter- <br />vention <br />period <br />of record <br /> <br /> <br />(water <br />years) <br />Streamflow <br />Step <br />Signif- trend <br />icance <br /> <br />level feet) (acre- <br /> <br /> <br />er- <br />1 <br /> <br />cent Dissolved solids <br />Concentration Load <br /> <br />Signif- Step Per- Signif- Step <br />icance trend ' icance trend <br /> <br />level (mg/L) cent level (tons) <br /> <br /> <br />er- <br /> <br />1 <br />cent <br />5 Alva B. Adams Tunnel/Lake Granby 1942-49 1950-83 S -330,000 18 HS 39 17 -- -- -- <br />10 Alva B. Adams Tunnel/Lake Granby 1934-49 1950-83 MS -385, <br />000 13 -- -- -- MS -89,000 6 <br />13 Blue Mesa Reservoir 1934-65 1966-83 -- . <br />-- -- -- -- -- MS -119,000 8 <br />21 Alva B. Adams Tunnel/Lake Granby 1929-49 1950-65 -- -- -- -- -- -- MS -594,000 14 <br />21 Blue Mesa Reservoir 1950-65 1966-83 -- -- -- -- -- -- -- -- -- <br />30 Fontenelle Reservoir 1952-63 1964-83 -- -- -- -- -- -- S 118,000 26 <br />34 Flaming Gorge Reservoir 1957-62 1965-83 -- -- -- HS 112 29 S 346,000 55 <br />43 Expansion of Strawberry Reservoir 1957-72 1973-83 -- -- -- -- -- -- -- -- -- <br />50 Meeker well plugged 1951-68 1969-83 -- -- -- HS -89 19 -- -- -- <br />54 Flaming Gorge Reservoir 1929-62 1965-83 -- -- -- HS 29 7 MS 330,000 14 <br />57 Joes Valley Reservoir 1947-65 1966-83 -- -- -- -- -- -- -- -- -- <br />61 Navajo Reservoir 1956-61 1964-83 -- -- -- -- -- -- -- -- -- <br />68 Navajo Reservoir 1930-61 1964-83 -- -- -- MS 47 11 -- -- -- <br />69 Lake Powell filling 1942-62 1966-80 S -2,705,000 24 -- -- -- HS -1 ,588,000 19 <br />'Percent of preintervention median. <br />i