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<br />00[1199
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<br />
<br />CIlAPl'ER V.
<br />
<br />Historic flows, Colorado River and
<br />
<br />Number
<br />
<br />Period
<br />of
<br />record
<br />Colorado River
<br />Near Colo.-Utah line 1951-67
<br />Near Cisco, Utah 1911-67
<br />Hite, Utah 1947-58
<br />Lees Ferry, Ariz. 1911-62
<br />Dolores River
<br />1936-54
<br />1950-67
<br />Green River
<br />Y1894-1967
<br />San Juan River
<br />Near Bluff Utah 1 14-6
<br />No record available for 1900-03 period.
<br />
<br />Gap;inp; station
<br />Location
<br />
<br />9-1635
<br />9-1805
<br />9-3350
<br />9-3800
<br />9-1795
<br />9-1800
<br />9-3150
<br />
<br />Gateway, Colo.
<br />Near Cisco, Utah
<br />
<br />Green River, Utah
<br />
<br />
<br />tributaries
<br />Drainege
<br />area
<br />(square
<br />miles)
<br />
<br />17,900
<br />24,100
<br />76,600
<br />108,335
<br />
<br />4,350
<br />4,580
<br />
<br />40,600
<br />
<br />000
<br />
<br />
<br />WATER RESOURCES
<br />
<br />Average
<br />annual
<br />runoff
<br />(acre-feet )
<br />
<br />4,048,000
<br />5,619,000
<br />9,775,000
<br />12,923,000
<br />
<br />679,100
<br />480,000
<br />
<br />4,611,000
<br />
<br />1 1 000
<br />
<br />Historical flows were modified to reflect present and anticipated
<br />future conditions of upstream development in a Department of Interior re-
<br />port of January 1967 entitled "Progress Report No.3, Quality of Water,
<br />Colorado River Basin." The anticipated developments include all Federal
<br />projects now being developed or authorized plus private and other proj-
<br />ects with equivalent prospects of realization. These developments plus
<br />present uses will approach full upstream water utilization under existing
<br />rights without potential flow augmentation. The historic and estimated
<br />modified flows based on flow records for the 24-year period 1941 through
<br />1964 are shown on the following table.
<br />
<br />river flows
<br />Flows (acre-feet)
<br />Present
<br />modified
<br />3,995,000
<br />1,580,000
<br />4,810,000
<br />
<br />.
<br />
<br />Historic and modified
<br />
<br />Gap;e location
<br />Green River at Green River
<br />San Juan River near Bluff
<br />Colorado River near Cisco
<br />
<br />Historic
<br />1941-64
<br />4,102,000
<br />1,633,000
<br />5,029,000
<br />
<br />Creek flows
<br />
<br />Future
<br />modified
<br />3,554,000
<br />1,129,000
<br />3,984,000
<br />
<br />The most valuable water supply used within the San Juan Area comes
<br />from La Sal and Abejo Mountain areas above 9,000 feet in elevation.
<br />This water comes mainly from the spring melting of winter snows. Creeks
<br />on the south side of the mountains reach their peak spring flows sev-
<br />eral weeks before those on the north side.
<br />
<br />Runoff from areas below elevation 7,000 feet is erratic. Much of
<br />it results from thunderstorms which occur mostly in the late summer or
<br />. early fall. This type of runoff is characterized by high flows of short
<br />
<br />44
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