Economic Analysis of Critical Habitat Designation in the Colorado River Basin for the Razorback Sucker, Humpback Chub, Colorado Squawfish, and Bonytail April 1994

• Description: Economic Analysis of Critical Habitat Designation in the Colorado River Basin for the Razorback Sucker, Humpback Chub, Colorado Squawfish, and Bonytail April 1994
• State: CO
• Basin: Colorado Mainstem
• Date: 4/1/1994
• Title: Economic Analysis of Critical Habitat Designation in the Colorado River Basin for the Razorback Sucker, Humpback Chub, Colorado Squafish, and Bonytail April 1994
• Water Supply Pro - Doc Type: Report/Study

b. Colorado Squawfish
The Colorado squawfish is the largest in size of the four existing species. Fossils of the
mid - Pliocene epoch (about 6 million years ago) indicate that the genus had adopted riverine
forms that are similar to modem forms. Historically the Colorado squawfish occurred
throughout the Colorado River Basin.
USFWS is designating 6 reaches of the Colorado River system (Figure I -2 -2) as critical
habitat for the Colorado squawfish. In the Upper Basin, critical habitat includes areas of the
Green, Yampa, Colorado, White, Gunnison, and San Juan rivers. Of the historical range of
the Colorado squawfish, 29 percent is being designated as critical habitat.
Figure I -2 -2. Map of Critical Habitat for the Colorado Squawfish.
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Figure I -2 -2. Map of Critical Habitat for the Colorado Squawfish.
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