WSP05745

• File Number: 8240.200.43.A.2
• Description: Grand Valley/Orchard Mesa
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 2/1/1999
• Title: Evaluation of Fish Passage at the Grand Valley Irrigation Company Diversion Dam on the Colorado River Near Palisade, CO - Draft Report
• Water Supply Pro - Doc Type: Publication

Table 1. Summary of Sa~ling effort and the number of native and nonnative
fishes capture and recaptured with electrofishing up- and downstream
of the Grand Valley Irrigation Company Diversion Dam, April through
October 1998. Note: Fish were only marked downstream of the diversion
dam. Refer to Appendix Tables B.l. and C.l. for the number of fish
marked and recaptured by species.
River Number of Hours Electrofishinq Total Number
Stage/ Upstream of Downstream of Marked/Tagged or Total Number
Sampling Diversion Diversion Captured Recaptured
Date 187.6-185.5 185.3-183.0 Native Nonnative Native Nonnative
Pre-runoff
04/03 1.18 32 0
04/13 0.81 128 21 0 0
04/14 0.59 69 10 0 0
04/16 0.77 83 18 0 0
04/20 0.66 61 15 2 0
04/23 0.81 110 14 2 0
04/24 0.64 83 18 3 2
04/27 0.77 109 58 0 0
04/27 1.65 180 38 6 0
Subtota 1 Upstrm 0.77 109 58 0 0
Subtotal Dwnstrm 7.11 746 134 13 2
Post-runoff
07/17 0.62 95 5 3 0
07/20 0.59 84 8 1 0
07/21 0.61 23 3 0 1
08/19 0.88 283 19 0 0
08/19 0.69 66 19 0 0
08/20 0.99 292 24 0 0
08/20 0.78 109 21 0 0
08/24 0.83 370 21 0 0
08/24 0.68 190 4 10 0
08/26 0.89 258 22 0 l'
08/26 0.88 127 22 7 1
08/28 0.93 326 23 0 0
08/28 0.87 131 28 6 2
09/23 0.87 175 10 0 0
09/24 0.82 213 14 0 0
10/15 0.94 102 11 0 0
10/20 0.84 97 9 0 0
10/21 0.78 86 10 0 0
Subtotal Upstrm 8.77 2,202 163 0 1
Subtotal Dwnstrm 5.72 825 110 27 4
~ . - - - . - - - - - - - - . - - . - - . . . . - - - . . . . - - - - - - - - - - - . . . . - - . - . . . - - - - - - - - - . . - - . - - - . - - - - - - . . . - - - - - - - -
TOTALS Upstrm 9.54 2,311 221 0 1
TOTALS Dwnstl'lll 12.83 1,571 244 40 6
. denotes the only marked fish recaptured upstream of the diversion dam.
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