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<br />UNITED STATES DEPARTMENT OF THE INTERIOR
<br />GEOLOGICAL SURVEY
<br />Water Resources Division
<br />Utah District
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<br />
<br />STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN
<br />April 1971
<br />
<br /> Month1v dischar"e Maximum daily Minimum dailv
<br /> Percent of
<br />Stream ~/Median (Cfs) Mean (Cfs) 3D-year
<br /> 1931-60 this month median Cfs-davs Acre-feet Cfs Date Cfs Date
<br />Colorado River
<br />near CiscOb Utah 7,081 9,822 139 294,660 584,500 13,100 18 7,220 4
<br />Adjuste~/ 9,040 128 271,187 537,900 - - - -
<br />Green River at
<br />Green River, Ut 7,381 8,045 109 241,350 478,700 12,400 20 4,920 9
<br />Adjusted,S/ 9 927 134 297,807 590,700 - - - -
<br />San Juan River
<br />near Bluff, Ut 3,254 1,118 34 33,532 66,510 1,400 3 866 13
<br />AdjustedE./ 1,738 53 52,135 103,410 - - - -
<br />
<br />a/ Median of mean discharges for the month for 3D-year period 1931-60.
<br />~/ Adjusted for change in storage in Blue Mesa Reservoir. Storage began October 27, 1965.
<br />c/ Adjusted for change in storage in Flaming Gorge Reservoir. Storage began November 1, 1962.
<br />4/ Adjusted for change in storage in Navajo Reservoir. Storage began June 27, 1962.
<br />
<br /> Drainage area Usable End-of-month Change during
<br />Reservoir above dam capacity usable contents month
<br /> so. mi. (acre-feet) (acre-feet) (acre-feet)
<br />Blue Mesa Reservoir near
<br />Saoinero Colorado 3 426 829 500 259.100 -46 600
<br />Flaming Gorge Reservoir at
<br />Flaming Gorge Dam, Utah ~/ 15,100 3,749,000 1,986,000 +112,000
<br />Navajo Reservoir near
<br />Archuleta, New Mexico ~/ 3,230 1,696,000 868,700 +36,900
<br />Lake Powell Reservoir at
<br />Glen Canyon Dam, Arizona a/107,700 25,002,000 12,511,000 +77,000
<br /> .-
<br />Totals 31 276 500 15 624 800 +179 300
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<br />.e/ Approximate
<br />
<br />Leon J. Jensen, Engineer
<br />Salt Lake City, Utah
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