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7,600 <br />RECENT <br />1916-80 <br />?- HISTORIC <br />6,000 <br />U <br />W <br />N <br />4,600 <br />LL <br />V 3,000 <br />m <br />U <br />1,600 <br />SAN JUAN RIVER <br />0. 1 <br />JAN FES MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br />40,000 <br />RECENT <br />1088-39 <br />-i- HISTORIC <br />1908-23 <br />U 30,000 <br />W <br />F- <br />V- 20,000 <br />U <br />m <br />U 10,000 <br />COLORADO RIVER <br />CO-UT STATE LINE <br />JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br />20,000 <br />RECENT <br />1004-88 <br />-4- HISTORIC <br />1047-62 <br />U 16,000 <br />W <br />U <br />1- <br />LL 10,000 <br />U <br />00 <br />U 6,000 <br />GREEN RIVER <br />AT JENSEN <br />JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br />Figure 10. Mean monthly discharge at USGS gaging stations on three upper <br />Colorado River basin rivers. Recent and historic hydrographs are from <br />years during pre- and post-development periods for which records are <br />available. San Juan River periods are pre- and post-Navaho Dam; Green <br />River periods are pre- and post-Flaming Gorge dam. <br />36