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Table 4. Summary of recent and historic mean monthly river discharge for
<br />the Colorado River at the top of the 15-mile reach and at the
<br />Colorado/Utah state line, and for the Gunnison River near Grand. Junction
<br />(including Redlands power canal). Different years of record for historic
<br />and recent periods for the three reaches is due to different upstream,
<br />water development histories for the Colorado and Gunnison rivers and due
<br />to differences in dates of gage installation. Standard deviation in paren-
<br />theses.
<br />Mean
<br />Years No. years High day April May June
<br /> 15-mile reach
<br />1954-1989 36 16,524 2,206 7,571
<br /> (8,051) (1,575) (3,990)
<br />1902-1942 41 29,554 3,052 13,054
<br /> (9,946) (1,343) (4,304)
<br />recent/historic 55.9 8 72.3 58.0 %
<br /> Gunnison
<br />1966-1989 24 8,778 2,978 5,351
<br /> (5,342) (1,792) (3,226)
<br />1897-1936 28 17,021 3,167 9,651
<br /> (7,370) (1,491) (4,225)
<br />recent/historic 51.6 % 94.0 $ 55.4 %
<br /> State line
<br />10,654
<br />(5,978)
<br />19,134
<br />(7,956)
<br />55.7 %
<br />4,706
<br />(3,559)
<br />9,580
<br />(4,544)
<br />49.1 %
<br />1966-1989 24 25,504 6,128 14,115 17,061
<br />(14,895) (3,317) (8,014) (10,058)
<br />1908-1923 16 49,100 7,219 24,191 33,384
<br />(17`,468) (1,982) (7,522) (12,146)
<br />recent/historic 51.9 $ 84.9 $ 58.4 51.1 $
<br />28
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