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<br />WY <br />l <br />Flaming Gorge <br />1 Reservoir <br />I <br />NV -Yompa R. <br />UT <br />White R. <br />N I Green ' Colorado R. <br />R_ <br />co <br />I I Aspinall Unit <br />' Gunnison R. <br />I Lake <br />Powell Son Juan R. <br />Navajo Reservoir <br />Lake I Y? - <br />\ Mead <br />\ F-Colorado R. <br />\ - Lake <br />Mohave I <br />AZ I <br />Lake <br />Havasu <br />I <br />btt,??salt CA R. i <br />GIa . Q.. Gila R. <br />? I <br />Gulf of <br />California <br />Mexico <br />NM <br />0 80 160 km <br />Impoundment <br />Downstream Impacts <br />Dam or Obstruction / <br />Figure 1. Map of the Colorado River and major tributaries showing habitat fragmentation <br />and flow alteration by dams. Tyus (1991).