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<br />CON TEN T S <br /> <br />Page <br /> <br />....... <br />Cf' Abstract----------------------------------------------------------------- 1 <br />~;, Introduction------------------------------------------------------------- 2 <br />~'! Hydrogeologic system----------------------------------------------------- 2 <br />Precipitation and streamflow---------------------------------------- 2 <br />Geology and ground water-------------------------------------------- 4 <br />Data collection and method of analysis----------------------------------- 12 <br />Ground-water salinity contribution---------------------------------------' 15 <br />Colorado River region----------------------------------------------- 16 <br />Colorado upper headwaters subregion---------------------------- 16 <br />Blue River------------------------------------------------ 16 <br />Eagle River----------------------------------------------~ 22 <br />Roaring Fork River---------------------------------------- 24 <br />Main-stem Colorado River upper headwaters----------------- 26 <br />Salt-load distribution------------------------------------ 30 <br />Gunnison subregion--------------------------------------------- 32 <br />East and Taylor Rivers------------------------------------ 34 <br />Tomichi Creek--------------------------------------------- 39 <br />Upper Gunnison River-------------------------------------- 39 <br />North Fork Gunnison River--------------------------------- 40 <br />Uncompahgre River----------------------------------------- 41 <br />Lower Gunnison River--------------------------------------' 42 <br />Salt-load distribution------------------------------------ 43 <br />Colorado lower headwaters subregion---------------------------- 44 <br />Dolores subregion---------------------------------------------- 53 <br />Upper Dolores River--------------------------------------- 53 <br />San Miguel River------------------------------------------ 58 <br />Lower Dolores River--------------------------------------- 61 <br />Salt-load distribution------------------------------------, 62 <br />Colorado subregion--------------------------------------------- ,62 <br />Green River region-------------------------------------------------- 64 <br />Upper Green subregion------------------------------------------ 64 <br />Yampa subregion------------------------------------------------ 70 <br />White subregion------------------------------------------------ 77 <br />Lower Green subregion------------------------------------------ 83 <br />Summary and conclusions-------------------------------------------------- 87 <br />References--------------------------------------------------------------- 92 <br />Supplemental information------------------------------------------------- 93 <br />Chemical analyses of surface water from sampling sites and of water <br />from major springs------------------------------------------------ 94 <br /> <br />ILLUSTRATIONS <br /> <br />Page <br /> <br />Figure 1. <br />2. <br /> <br />Map showing location of study area and major subregions------ <br />Map showing major hydrogeologic units in the Upper <br />Colorado River Basin--------------------------------------- <br /> <br />3 <br /> <br />13 <br /> <br />iii <br />