7822

• UCREFRP Catalog Number: 7822
• Author: Miller, W. H., et al.
• Title: Colorado River Fishery Project, Part I, Summary Report.
• USFW Year: 1982.
• USFW - Doc Type: ‎(contract no. 9-07-40-L-1016 with the Bureau of Reclamation)‎,
• Copyright Material: NO

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Streamflow and water temperature requirements needed to
maintain present production levels for Colorado squawfishl/
and humpback chub in the Upper Colorado River, data base to 1981
Fish species and Time Flow Temp._
Critical areas life stage period (cfs) (C) _
Colorado River
Loma - Utah Line
(RM 132-154)
Colorado squaw-
fish spawning and
larval stage
6/15-7/31 5,000-10,000 20-22
8/1-8/31 3,000-5,000 20-28
Black Rocks
(RM 135-137)
Humpback chub
spawning
Westwater Canyon Humpback chub
(RM 116-124) spawning
Potash - Cataract Colorado squaw-
Canyon (RM 3-47) fish YOY rearing
Green River
Split Mountain
(RM 199-207)
Colorado squaw-
fish spawning
Jensen - Sand
Wash (RM 212-290)
Colorado squaw-
fish YOY rearing
5/1-6/30 10,000-13,000 16-18
5/1-6/30 10,000-13,000 16-18
7/15-10/15 4,000-9,000 20-28
6/15-7/31 3,000-4,000 20-22
8/1-8/31 2,000-2,500 20-22
7/15-10/15 2,000-4,000 20-28
l/ Analysis of the last 20 years of information indicates that
Colorado squawfish production is declining and present production levels
may be inadequate to prevent species from going to extinction.
2/ Flow is given as a minimum range for the period of requirements.
For instance, 10,000 cfs at Loma for spawning in mid-June could normally
drop to 5,000 by the end of July.
3/ Temperatures are expressed as optimum averages and fluctuations
of 1=2° C would be considered normal.
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