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<br />..... <br />.::. <br />.::. <br />:c <br /> <br />southern boundaries of the study unit (Driver. 1994). <br />The major lributaries to the Colorado River in the <br />study unit are the Blue. Eagle. Roaring Fork, and <br />Gunnison Rivers. <br />The VeOl study unit is divided almost equally <br />inlo two physiographIc provinces-the Southern <br /> <br />Rocky Mountains in the eastern pan and the Colorado <br />Plateau in (he western part (Apodaca and others. <br />1996). The climate varies from alpine conditions in <br />the east to semiarid in the west. Precipitation is highly <br />variable throughout the study unit and ranges from <br />more than 50 in/yr in the higher altitudes to less than <br /> <br />Utah <br /> <br />" <br /> <br />. Colorado <br /> <br />>oe.n <br />!'-.f\....V\.....,......J \" <br />Upper Colorado River Basin i, \ <br />f. Grand ( <br />SOUTHERN ROCKY >07' ..F" ' Rioty ] <br />MOUNTAINS ;::~..r1~:Ult \ .,. ( <br /> <br />COLORADO PLATEAU RioBI.n,.y-f :L--__~... ) <br />",,'^""ll . '% \ f"' <br />RioBllloco._.. 1OB?,\, .. CuRle -~+ "-C Summit <br />109" ...:::r- 'v--..I""'-...J , R 'l .. <br />~.....I' . ? <br />,,/ e.,IV""!"" 0 """J""""" \' ).. <br />~ Garfield '\, Eagle ).. <br />. ,.. ~ <br />~) x- \ +0 u ,J'- ~ oO' <br />~.. Mesa' 1 "'''''-'>1' j <br />4. "'"' . r <br />..--;:':.') ~.'" - .--v-' i" .. '( .. :)--.1., <br />c.... <br /> <br />) 0 Gunnison <br />'. _ ~""11' , <br />-- ~ <br />\) 0 -::: .f>, : ,~". \ <br />_ /0 '"' <br />..: "".m_ '" -",: <br />'---.... Montrose ~ " _.~ <br />\"'''i"L.~~:~7.." , /,'.1 <br />,)"1 ... \IllH -, ..... _ sagu~~:;./ <br /> <br />"'''llJJ\'tnj(~ \ Ouray '> Hinsdale ( <br />3.",,",- ! - <br />'.........') roO .-y/ <br />........../ <br /> <br />" <br /> <br />, <br /> <br />3' <br /> <br />EXPI.ANA nON <br /> <br />--. <br /> <br />Physiographic Province <br />Boundary <br /> <br />Figure 1. locatIon at the Upper Colorado River BaSin study unit. phYSIographiC proV1nces. and major streams. <br /> <br />INTRODUCTION 3 <br />