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<br />acre-feet was in the Lower Basin. The 1981 calendar year <br /> <br />storage in the Colorado River system was about 3.3 million <br /> <br />~ acre-feet less than the 1980 value. On June 22, 1980, Lake <br />~ <br />~l Powell filled to the 3,700 foot elevation and 250,000 acre- <br /> <br />feet were released over the spillway during the following <br /> <br />twenty days. <br /> <br />Historical Uses <br /> <br />, <br />Estimated historical Upper and Lower Basin uses for the <br /> <br /> <br />calendar year 1973 through 1981 are shown on Table 2. <br /> <br />~~ <br />