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

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Table A2. Estimated effect of the Aspinall Unit on mean, bi-monthly water
temperature in the Colorado River at river miles 49 and 136. SNTEMP
calculated downstream temperatures using water temperature of the Gunnison
River at the Gunnison Tunnel. Water temperature at the tunnel before
construction of Aspinall was estimated by adding 6 °C to March, April, May,
and September temperatures and by adding 11 °C to June, July, and August
temperatures.
River Mile 49
With Without Differ-
Aspinall Aspinall ence
~°C) ~°C) ~°C)
River Mile i36
With Without lliffer-
Aspinall Aspinall ence
~°C) ~°C) ~°Ci
Mar 1-15 8.46 8.46 0 8.53 8.51 + 0.02
Mar 16-31 9.65 9.62 + 0.03 9.48- 9.43 + 0.05
Apr 1-15 11.13 11.16 - 0.03 10.60 10.65 - 0.05
Apr 16-30 12.82 12.87 - 0.05 12.47 12.56 - 0.09
May 1-15 13.21 13.37 - 0.16 12.40 12.69 - 0.29
May 16-31 14.75 14.96 - 0.21 12.97 13.27 - 0.70
Jun 1-15 17.15 17.43 - 0.28 14.65 15.03 - 0.38
Jun 16-30 20.85 21.24 - 0.39 17.12 17.65 - 0.53
Jul 1-15 22.97 23.27 - 0.30 19.09 19.52 - 0.43
Jul 16-31 24.41 24.53 - 0.12 20.89 21.12 - 0.23
Aug 1-15 23.96 24.02 - 0.06 20.95 21.09 - 0.14
Aug 16-31 22.53 22.56 - 0.03 19.69 19.79 - 0.10
Sep 1-15 20.71 20.74 - 0.03 18.25 18.35 - 0.10
Sep 16-31 17.51 17.59 - 0.08 15.65 15.85 - 0.20
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