7740

• UCREFRP Catalog Number: 7740
• Author: McAda, C. W. and L. R. Kaeding.
• Title: Physical Changes in the Gunnison and Colorado Rivers Resulting from Construction of the Aspinall Unit and Related Projects, with Hypotheses to Assess the Effects on the Endangered Fishes
• USFW Year: 1991.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

t ~
Tab 1e A6. Mean-monthly streamflow for the Colorado River at the Cisco U.S.G.S. stream
gage for three time periods: early development (1914-1938), middle development (1939-1965)
and post Aspinall (1966-1989).
Mean-monthly streamflow (CFS)
Month
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
Early
Development
Mean SEM
Middle
Development
Mean SEM
Post
Aspinall
Development
Mean SEM
Percent Change
Early Middle Early
to to to
Middle Post Post
2;408.7 90.6 2,671.8 63.4 4,073..5 223.0 + 10,9 + 52.5 + 69.1
2,733.7 97.2 2,874.1 111.2 4,125.1 245.5 .- 5.1 + 43.5 + 50.9
3,375.1 224.6 3,205.1 121.4 4,764.3 346.5 - S.0 + 48.6 + 41.2
9,631.6 805.4 8,317.4 938.1 8,012.2 907.5 - 13.6 - 3.7 - 16.8
24,442.5 1,915.7 19,392.9 1,694.0 16,915.6 1,912.4 - 20.7 - 12.8 - 30.8
29,821.7 2,611.9 21,639.5 1,878.1 18,861.4 2,227.7 - 27.4 - 12.8 - 36.8
11,025.0 1,182.6 8,124.7 1,234.9 8,824.1 1,297.5 - 26.3 + 8.6 - 20.0
5,057.6 643.2 3,738.2 414.9 4,278.3 501.8 -26.1 + 14.4 - 15.4
3,980.7 554.0 2,949.5 224.2 4,036.4 304.6 - 25.9 + 36.9 + 1.4
3,869.8 319.5 3,553.5 309.4 4,487.8 330.5 - 8.2 + 26.3 + 16.0
3,280.7 141.1 3,462.2 133.1 4,594.1 267.5 + 5.5 + 32.7 + 40.0
2,622.7 88.8 2,918.5 88.9 4,285.8 226.0 + 11.3 + 46.8 + 63.4
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