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Table 5. Percent flow contribution to the mainstem Colorado River from
<br />its two major tributaries, the Gunnison River and the upper Colorado River
<br />above Grand Junction, April-June, 1966-1989 and 1917-1923. 15M - upper end
<br />of 15-mile reach; GU = Gunnison River including power canal return; STL-
<br />GU: amount measured at state-line gage minus the amount contributed by
<br />the Gunnison River (assumes Redlands irrigation returns to be negligible),
<br />i.e., 15-mile reach plus all returns from Colorado River diversions.
<br />APR MAY JUN
<br />15M GU STL-GU 15M GU STL-GU 15M GU STL-GU
<br />N (yr)
<br />Range
<br />Mean
<br />SD
<br />N (yr)
<br />Range
<br />Mean
<br />SD
<br />24 24 24
<br />25-58 33-59 41-66
<br />37.2 46.8 53.3
<br />(7.8) (7.9) (7.9)
<br />7 7 7
<br />1966-1989
<br />24 24 24
<br />41-70 25-49 51-75
<br />54.9 36.7 63.3
<br />(8.0) (7.1) (7.1)
<br />1917-1923
<br />7 7 7
<br />24 24 24
<br />53-80 16-34 66-84
<br />65.4 25.7 74.3
<br />(6.8) (5.6) (5.6)
<br />7 7 7
<br />40-58 42-49 51-58
<br />50.2 44.8 55.2
<br />(6.1) (2.3) (2.3)
<br />49-65 39-47 53-63
<br />57.6 42.9 57.1
<br />(5.9) (3.9) (3.9)
<br />59-82 30-39 61-70
<br />67.6 33.6 66.4
<br />(8.3) (3.1) (3.1)
<br />Table 6. Comparison of river discharge at the State-line gage with that
<br />at Cameo (plus Plateau Creek) and with that at the top of the 15-mile
<br />reach for the high day of the year. Records are for those years when the
<br />peak flow at the State-line gage was between 30,000 and 40,000 cfs. Dis-
<br />charge at Cameo prior to 1933 was calculated using data from an earlier
<br />gage at Palisade and adding diversions immediately upstream.
<br />Year Stln Cameo 15-mile Year Stln Cameo 15-mile
<br />1986 32,800 24,380 22,880 1953 35,600 23,856 22,356
<br />1985 38,200 26,354 24,300 1947 36,971 25,638 24,138
<br />1980 30,200 21,240 19,740 1943 30,739 21,906 20,406
<br />1979 35,400 22,140 19,450 1937 35,274 20,810 19,360
<br />1973 33,500 25,400 23,900 1919 32,200 21,400 20,850
<br />1970 32,300 24,090 22,640 1916 39,600 25,800 25,200
<br />1965 35,800 22,880 21,380 1911 38,800 24,800 24,200
<br />1962 39,200 25,540 24,090 1910 34,100 27,100 26,500
<br />34
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