Endangered and Threatened Wildlife and Plants; Determination of Critical Habitat for the Colorado River Endangered Fishes: Razorback Sucker, Colorado Squawfish, Humpback Chub, and Bonytail Chub

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The Fish and Wildlife Service designates critical habitat for four species of endemic Colorado River Basin fishes: Razorback sucker (Xyrauchen texanus), Colorado squawfish (Ptychocheilus lucius), humpback chub (Gila cypha), and bonytail chub (Gila elegans). These species are listed as endangered under the Endangered Species Act of 1973, as amended. The critical habitat designated is located primarily on Federal land and, to a lesser extent, on tribal, State, and private lands. The designation provides additional protection required under section 7 of the Act with regard to activities that require Federal agency action. The Service designates 3,168 km (1,980 mi) of critical habitat for the four Colorado River endangered fishes in portions of Colorado, Utah, New Mexico, Arizona, Nevada, and California. The areas designated for each species also overlap some areas designated for the other species.