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

N
Table A5. Mean-monthly streamflow for the Gunnison River near Grand Junction for three
time periods: early development (1917-1938), middle development (1939-1965) and post
Aspinall (1966-1988),
Mean-monthly streamflow (CFS)
Post Percent Change
E
l Middl i
ll ---- ------
ar
y e Asp
na -- -------
Development Devel opment Development Early Middle Early
-------- ---- ---- ----- to to to
Month Mean SEM Mean SEM Mean SEM Middle Post Post
JAN 878.8 32.1 865.4 21.7 2,195.8 156.3 - 1.5 +153.7 +?49.9
FEB 966.5 38.9 907.3 28.8 2,109.0 191.0 - 6.1 +132.4 +118.2
MAR 1,173.2 60.4 1,010.8 43.8 2,223.6 215.4 - 13.8 +120.0 + 89.5
APR 3,289.8 333.4 3,071.6 380.8 3,027.8 373.1 - 6.6 - 1.4 - 8.0
MAY 9,666.0 845.8 7,418.7 729.2 5,554.6 654.3 - 23.2 - 25.1 - 42.5
JUN 9,251.3 949.3 7,236.5 774.4 4,909.8 725.4 - 21.8 - 32.2 - 46.9
JUL 2,708.9 328.6 2,382.2 469.8 2,314.6 386.5 - 12.1 - 2.6 - 14.4
AUG 1,307.1 189.9 1,211.8 145.7 1,490.1 157.9 - 7.3 + 23.0 + 14.0
SEP 1,180.0 222.1 1,033.7 91.8 1,772.0 145.4 - 12.4 + 71.4 + 50.2
OCT 1,237.6 106.2 1,181.2 104.3 1,912.1 159.1 - 4.6 + 61.9 + 54.5
NOV 1,235.3 57.5 1,182.6 52.8 2,012.9 136.9 - 4.3 + 70.2 + 62.9
DEC 1,010.4 27.8 963.3 33.1 2,178.6 137.8 - 4.7 +126.2 +115.6
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