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<br />0~C.\'
<br />~~vv
<br />
<br />to Lake Powell fot April through July of 1968
<br />was 7,247,000 acre-feet.
<br />
<br />Table 1
<br />U.S. BUREAU OF RECLAMATION FORECASTS OF
<br />APRIL-JULY RUNOFF !NTO LAKE POWEU
<br />
<br /> !If tan Mton ForuaJt %of
<br /> Fortcost. % of A!ura~(t Actual
<br />1968 Fortcasts as of (Acrt-ful) 1906.196 Runoff
<br />January L________ 7,700,000 92 106
<br />February L _ __ nu 6,700,000 80 92
<br />March L__________ 7,000,000 83 97
<br />April L___________ 6,WO,OOO 82 95
<br />May L_ _ _ __ _ _u__ 7,300.000 87 101
<br />June L___________ 7,300,000 87 101
<br />
<br />. Under condition$ of no other Colorado River Project RCiCrvoiu.
<br />t U.S.B.R. estim;nc: of average: April-July inflow8 to Lllr.e Powell for the: 1906-
<br />1967 period i, 8,400,000 acre-feet.
<br />
<br />The 1967-68 water year measured flows, at
<br />the three upstream stations which account for
<br />approximately 95 percent of the inflow to Lake
<br />Powell, arc shown in Table 2. Regulated releases
<br />below Hoover Dam, which were limited to the
<br />amounts necessary to meet consumptive use re-
<br />quirements in the United States and the obliga-
<br />tions to Mexico, are also shown in Table 2.
<br />
<br />Table 2
<br />MEASURED FLOW IN COLORADO RIVER
<br />BASIN FOR WATER YEAR 1967-68
<br />(Thousonds of Acre.feet)
<br />
<br />Station
<br />
<br />MtQsurtd
<br />Flow
<br />
<br />Uppu Basin
<br />Green R. @Green Ri\"er (Utah)_____ __un_un
<br />Colorado R. @ Cisco (Uuh)_____________________
<br />San Juan R. @ Bluff (Utah)_______n____________
<br />
<br />4.720
<br />4,084
<br />999
<br />
<br />Colorado R. at Lee Ferry _ __ ____ ____ 8,318
<br />
<br />Lowu Balin-Co/orado R.
<br />Near Grand Canyon________n____ _____________ 8,936
<br />Below Hoo\'er Dam_____________________________ 7,830
<br />Below Davis Dam__________ ____________n_____ 7,867
<br />Below Parker Dam_____________________________ 6,466
<br />Flow into Mexico___ _ _ _. _ _ _ _ _ _ _ __ __ __ _ _ _ _ _ ______ 1,563
<br />
<br />Article III (d) of the Colorado River Compact
<br />provides that the States of the Upper Division
<br />will not cause the flow of the river at Lee F ert)'
<br />to be depleted below an aggregate of 75,000,000
<br />acre-feet for any period of ten consecutive years.
<br />In the past six years, since the beginning of stor-
<br />age in Lake Powell, the accumulation of storage
<br />in the Colorado River Storage Project reservoirs
<br />coupled with the generally low runoff has re-
<br />sulted in a total flow at Lee F ert)' of only
<br />39,782,000 acre-feet as shown below:
<br />
<br />24
<br />
<br />JVater Year
<br />1962-63
<br />1963-64
<br />1964-65
<br />1965-66
<br />1966-67
<br />1967-68
<br />
<br />Flow at Lee Ferry
<br />(A ere-Feel!
<br />nnunnunnnn.nn' nnnnn' 2,520,000
<br />____n_nnnn_nnn_nn_ ____nn_nn__ 2,427,000
<br />..._nnn........n n nun.. 10,835,000
<br />..UUU.UUUn_....................... 7,873,000
<br />_nn_____nmnnm_nm._nnn__ 7,809,000
<br />.nnnnnnn.....n.n 8,318,000
<br />
<br />Total ..............Un............. 39,782,000
<br />6- Year Average .............................. 6,630,000
<br />
<br />In the next four years it will be necessary to
<br />release 35,218,000 acre-feet at Lee Ferry or an
<br />average of 8,804,000 acre-feet a year in order
<br />that delivery will total 75,000,000 acre-feet for
<br />the ten-year period 1963-1972. The Bureau of
<br />Reclamation has acknowledged this required re-
<br />lease rate, having informed the Board by a letter
<br />dated June 9, 1967, that it will provide for a
<br />flow of 8,800,000 acre-feet a year at Lee Ferry
<br />from 1969 through 1972.
<br />Section 602 of P.L. 90-537 provides that the
<br />Secretary of the Interior shall adopt, by July 1,
<br />1970, criteria for the coordinated long-range
<br />operation of the major reservoirs in the Colorado
<br />River Basin. The criteria shall comply with the
<br />provisions of the Colorado River Compact, the
<br />Upper Colorado River Basin Compact, and the
<br />Mexican Water Treaty. Among other consider-
<br />
<br />Table 3
<br />
<br />CAPACITY AND SURFACE STORAGE OF MAJOR
<br />COLORADO RIVER BASIN RESERVOIRS
<br />
<br />(Thousond, of Acre.feet)
<br />
<br /> ActjfJ(
<br /> Slorag( Chang(
<br /> GroS! UJab/( End of During
<br />U pp(r Balin Capacity Capacity Sept. 1968 Y(ar
<br />Lake Powell. . _ __ _ ___ 27,000 25,002 7,514 +1,154
<br />Flaming Gorge_ _ _ _ _ __ 3,789 3,749 2,119 -595
<br />Navajo____ _ _ _ _ u____ 1,709 I,S34 848 +397
<br />Blue Mesan_______u 941 830 658 +228
<br />Fontenelle. _ ~ _ _ _ _ _ _ __ 345 345 303 +286
<br />Morrow Point.___ ____ 117 117 67 +67
<br />Subtotal.. _ _ _ ____ 33,901 31,577 11,509 +1,537
<br />Lo:()u Balin
<br />Lake Mead_ h__ _____ 28,537 26,159 15,018 +643
<br />Lake Mohave_______. 1,818 1,810 1,393 -9
<br />Lake Havasu____.____ 648 619 556 -3
<br />SubtotaL__n____ 31,003 28,588 16,967 +631
<br />Total Both Basins- _ __ 64,904 60,165 28,476 2,168
<br />
<br />. Slouge began January ]968.
<br />
<br />ations, the Secretary's criteria shall maintain, as
<br />nearly as practicable, active storage in Lake
<br />
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