WSP03151

• File Number: 8240.200.33.B
• Description: 15-Mile Reach ‎(UCRBRIP)‎
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1991
• Title: Recommendations for Flows in the 15-Mile Reach During October-June for Maintenance and Enhancement of Endangered Fish Populations in the Upper Colorado River
• Water Supply Pro - Doc Type: Publication

LIST OF TABLES

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Table

1.

Comparison between two channel types in frequency
by Colorado squawfish ...........................

2.

Pearson correlation coefficients (r) of larval (0
long) fish abundance (mean number per sample) and :t"'.rJ.Y
peak flow for three Grand Valley river reaches .................. 17

3.

Correlati~n coefficients (r), of fish densities (no. fish
per 100 m ) in backwaters during fall and yearly peak
flow for two Grand Valley river reaches ......................... 22

'-

4. Summary of recent and historic mean monthly river
'discharge for the Colorado River at the top of the
15-mile reach and at the ColoradojUtah State line, and
for the Gunnison River near Grand Junction (including

Redlands power canal) .........................................., 28

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5. Percent flow contribution to the mainstem Colorado River
from its two major tributaries, the Gunnison River and
the upper Colorado River above Grand Junction, April.June,
1966-1989 and 1917-1923 ......................................... 34

6. Comparison of river discharge at the State-line gage ,with
that at Cameo (plus Plateau Creek) and with that at the
top of the 15-mile reach for the high day of the year ........... 34

7. Peak flows and mean monthly flows in the upper end of the
15-mile reach during years in which peak flows at the
State line gage were about 40,000 cfs ................~.......... 44

8. Peak flows and mean monthly flows in the upper end of the
15-mile reach during years in which peak flows at the
State-line gage were about 30,000 cfs ........................... 44

9. Peak flows and mean monthly flows in the upper end of the
15-mile reach during years in which peak flows at the
State-line gage were about 22,000 cfs ........................... 45

10. Rec_ommendations for spring flows (in cfs) in the IS-mile

reach ........................................................... 46

11. Summary of recent and historic discharge for the Colorado
River at the top of the 15-mile reach during the months
of November-March... .-.:......................................... 49

12. Summary of recent and historic river discharge for the
Colorado River at the top of the 15-mile reach during the

months of July-October .......................................... 52

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