7984

• UCREFRP Catalog Number: 7984
• Author: Maddux, H. R., L. A. Fitzpatrick and W. R. Noonan.
• Title: Colorado River Endangered Fishes Critical Habitat - Draft, Biological Support Document.
• USFW Year: 1993.
• USFW - Doc Type: Salt Lake City, Utah.
• Copyright Material: NO

LIST OF FIGURES
FIGURE PAGE
1. Map of Colorado River Basin ................................... 4
2. Historical distribution (shaded area) of the razorback sucker . ............... 10
3. Historical distribution (shaded area) of the Colorado squawfish ............... 17
4. Historical distribution (shaded area) of the humpback chub . ................ 25
5. Historical distribution (shaded area) of the bonytail ...................... 32
6. Map of proposed critical habitat for the razorback sucker . ................. 42
7. Relative amount of historical habitat proposed as critical habitat for the razorback
sucker . ............................................. .45
8. Shoreline ownership for proposed critical habitat for the razorback sucker. ....... 45
9. Map of proposed critical habitat for the Colorado squawfish . .............. 102
10. Relative amount of historical habitat proposed as critical habitat for the Colorado
squawfish . ................................ .......... 104
11. Shoreline ownership for proposed critical habitat for the Colorado squawfish. ... 104
12. Map of proposed critical habitat for the humpback chub . ................ 121
13. Relative amount of historical habitat proposed as critical habitat for the
humpback chub. ....................................... 123
14. Shoreline ownership for proposed critical habitat for the humpback chub. ...... 123
15. Map of proposed critical habitat for the bonytail . ..................... 139
16. Relative amount of historical habitat proposed as critical habitat for the bonytail. . 141
17. Shoreline ownership for proposed critical habitat for the bonytail. .......... 141
18. Overall map of proposed critical habitat for the four Colorado River endangered
fishes .............................................. 155
19. Mean monthly discharge at USGS gaging stations on three upper Colorado River
basin rivers. Recent and historic hydrographs are from years during pre- and
post-development periods for which records are available. San Juan River
periods are pre- and post-Navaho Dam; Green River periods are pre- and post-
Flaming Gorge Dam (from Osmundson and Kaeding 1991) ............. 164
20. Mean monthly flows at Topock Marsh prior to pre-(1917-1933) and post-(1948-
1964) major construction of dams and diversions on the Colorado River
(USGS Topock gage data) ................................. 165
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