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<br />Ofn 796
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<br />TABLE I
<br />
<br />Year
<br />
<br />Colorado River San Juan River
<br />Runoff at Runoff at
<br />Lee Ferry Bluff
<br />(1,000 acre feet) (1,000 acre feet)
<br />
<br />San Juan River
<br />Runoff Percentage
<br />of Colorado River Runoff
<br />
<br />1942
<br />1943
<br />1944
<br />1945
<br />1946
<br />1947
<br />1948
<br />1949
<br />1950
<br />1951
<br />1952
<br />1953
<br />1954
<br />1955
<br />1956
<br />
<br />3,078
<br />1,445
<br />2,289
<br />1,620
<br />865
<br />1,488
<br />2,319
<br />2,523
<br />902
<br />668
<br />2,542
<br />935
<br />985
<br />988
<br />862
<br />
<br />1,567
<br />942
<br />
<br />18.1
<br />12,8
<br />17.3
<br />14,0
<br />9.9
<br />11.0
<br />16.9
<br />17.6
<br />8.2
<br />6,8
<br />14,1
<br />10.6
<br />16.l
<br />13,5
<br />9,9
<br />
<br />13,6
<br />12,2
<br />
<br />17 ,030
<br />11,259
<br />13,219
<br />11,546
<br />8,745
<br />13,513
<br />13,689
<br />14,360
<br />11,053
<br />9,831
<br />17,979
<br />8,805
<br />6,117
<br />7,308
<br />8,750
<br />
<br />11,547
<br />7,745
<br />
<br />1942-1956 Average
<br />1953-1956 Average
<br />
<br />The mean annual historic flow of the San Juan River at the Bluff, Utah,
<br />
<br />station for the thirty-two-year period, 1914-1945, as reported by the Upper
<br />
<br />Colorado River Compact Commission was 2,275,600 acre feet. For the same
<br />
<br />period, the flow of the Colorado River at Lee Ferry was 13,788,600 acre
<br />
<br />feet. During this thirty-two-year period, the runoff of the San Juan
<br />
<br />River at Bluff was 16.5% of the runoff of the Colorado at Lee Ferry, This
<br />
<br />(16,5%) compares with 13,6% for the fifteen-year period, 1942-1956, and
<br />
<br />
<br />12.5% for the recent four"year low flow period of 1953-1956,
<br />
<br />Watershed Runoff in Colorado
<br />
<br />The runoff of all perennial tributaries of the San Juan River leaving
<br />
<br />Colorado and entering New Mexico and Utah are measured by stream gaging
<br />
<br />-3-
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