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southern boundaries of the study unit (Driver, 1994). <br />The major tributaries to the Colorado River in the <br />study unit are the Blue, Eagle, Roaring Fork, and <br />Gunnison Rivers. <br />The UCOL study unit is divided almost equally <br />into two physiographic provinces-the Southern <br />Utah Colorado <br />Upper Colorado River Basin Grand <br />SOUTHERN ROCKY ~o'° ,~ ~ giver <br />~os° <br />MOUNTAINS 40° ~}-- <br />Routt <br />COLORADO PLATEAU Rio Blanc ~ _ .. j <br />~ ~ ~l f <br />Rio Blanco toe'. ,•. ~ Summit <br />tos° '~, f,,./~W~ • Eagle R ~~ <br />'~-'' , •~ <br />Colorado ~ ~ ' <br />Gaffield , GtenW sprutgs S ..~ f <br />• Eagle <br />Mesa ~ ~ 4~~ <br />Grand ~ <br />~.,. Junction i ~ - - ~ ~'p~ <br />- - ~~ <br />39°~ ' ~ ~ <br />~t <br />~~ - Delta ~~t ' j ~ ..~~ <br />rJ,oy1 ~ , <br />Delta , <br />__ <br />1 <br />1 ~ ~IL , <br />~ NA , <br />••~ Montrose p t <br />. Montrose ~ l <br />Gunnison <br />za ao MQ.ES <br />' ~ i <br />20 aoxboM~s Ouray ~ Hinsdale <br />38°~v.~ r <br />'~,..J <br />Gunnison <br />i <br />Saguac <br />'~ ~ EXPLANATION <br />Physiographic Province <br />~~. <br />Boundary <br />Figure 1. Location of the Upper Colorado River Basin study unit, physiographic provinces, and major streams. <br />Rocky Mountains in the eastern part and the Colorado <br />Plateau in the 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 />INTRODUCTION 3 <br />