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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 />STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BAS IN
<br />July 1971
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<br /> Monthly discharge Maximum dailv Minimum dallv
<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 Cisco, Utah 6,778 8,917 132 276,430 548,300 15,500 1 6,060 18
<br />Ad jus ted!l.1 9,548 141 295,992 587,100 - - - -
<br />Green River at
<br />Green River, Ut 5,975 6,504 109 201,630 400,000 14,400 1 4,000 28
<br />Adjusted.f.1 9,628 161 298,462 592,000 - - - -
<br />San Juan River
<br />near Bluff, Ut 1,754 1,079 61.5 33,451 66,350 1,830 1 632 19
<br />Adjusted~/ 1,151 65.6 35,669 70,750 - - - -
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<br />~I Median of mean discharges for the month for 30-year period 1931-60.
<br />~I Adjusted for change in storage in Blue Mesa Reservoir. Storsge began October 27, 1965.
<br />c/ Adjusted for change in storage in Flaming Gorge Reservoir. Storage began November 1, 1962.
<br />~I Adjusted for change in storage in Navajo Reservoir. Storage began June 27, 1962.
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<br /> Drainage area Usable End-of-month Change during
<br />Reservoir above dam capacity usable contents month
<br /> sa. mi. (acre-feet) (acre-feet) (acre-feet)
<br />Blue Mesa Reservoir near
<br />Sapinero, Colorado 3,426 829,500 619,900 +38,800
<br />Flaming Gorge Reservoir at ~/ 15,100 3,749,000 3,042,000 +192,000
<br />Flaming Gorge Dam, Utah
<br />Navajo Reservoir near !!/ 3,230 1,696,000 990,900 + 4,400
<br />Archuleta, New Mexico
<br />Lake Powell Reservoir at !./I07,700 25,002,000 14, 318 , 000 + 1,000
<br />Glen Canyon Dam, Arizona
<br />Totals 31,276,500 18,970,800 236,200
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<br />!!/ Approximate
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<br />Leon J. Jensen, Engineer
<br />Salt Lake City, Utah
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