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 Al. Estimated effect of the Aspinall Unit on mean bi-monthly water
temperature in the Gunnison River at River Miles 2 and 20. SNTEMP calculated
downstream temperatures using water temperature 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 2
River Mile 20
With Without Differ- With Without Differ-
Aspinall Aspinall ence Aspinall Aspinall ence
~°C) ~°C) (°C) ~°C) ~°C) ~°C)
Mar 1-15 6.99 6.95 + 0.04 6.72 6.68 + 0.04
Mar 16-31 8.23 8.11 + 0.12 7.96 7.81 + 0.15
Apr 1-15 9.27 9.36 - 0.09 8.89 8.98 - 0.09
Apr 16-30 11.59 11.80 - 0.21 11.19 11.42 - 0.23
May 1-15 11.70 12.40 - 0.70 11.28 12.05 - 0.77
May 16-31 12.16 13.04 - 0.88 11.66 12.60 - 0.88
Jun 1-15 14.34 15.59 - 1.25 13.64 15.00 - 1.36
Jun 16-30 17.35 19.28 - 1.93 16.20 18.33 - 2.13
Jul 1-15 19.94 21.64 - 1.70 18.68 20.67 - 1.99
Jul 16-31 22.44 23.41 - 0.97 21.29 22.54 - 1.25
Aug 1-15 22.98 23.60 - 0.62 22.04 22.90 - 0.86
Aug 16-31 21.23 21.69 - 0.46 20.45 21.12 - 0.67
Sep 1-15 19.24 19.64 - 0.40 18.57 19.14 - 0.57
Sep 16-31 16.21 16.82 - 0.61 15.76 16.55 - 0.79
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