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PURPOSE This document provides Federal, State, Tribal and local agencies, and the public with additional information about the proposed designation of critical habitat for four Colorado River endangered fishes. This document, the economic analysis, and other supporting documents provides additional information on the proposed designation. All comments received will be evaluated by the U.S. Fish and Wildlife Service (Service) for use in preparation of the final rule designating critical habitat for the four Colorado River endangered fishes. INTRODUCTION The Endangered Species Act (Act) of 1973, as amended, requires the Service to designate critical habitat to the maximum extent prudent and determinable concurrent with listing a species as endangered or threatened. This proposal is for four species of fish in the Colorado River Basin (Basin) which were listed as endangered without designation of critical habitat. The Colorado squawfish and humpback chub were listed as endangered species on March 11, 1967 (32 FR 4001). The bonytail was listed as endangered on April 23, 1980 (45 FR 27713). On May 16, 1975, the Service published a notice of its intent to determine critical habitat for the Colorado squawfish, humpback chub, and numerous other species (40 FR 21499). On September 14, 1978, the Service proposed critical habitat for the Colorado squawfish (43 FR 41060). The proposal was for 623 miles of the Colorado, Green, Gunnison, and Yampa Rivers. This proposal was later withdrawn (44 FR 12382; March 6, 1979) to comply with 1978 amendments to the Act (16 U.S.C. 1531 et. seq.), that required the Service to include critical habitat in the listing of most species and to complete the listing process within 2 years from the date of the proposed rule or withdraw the proposal from further consideration. The Service did not complete the listing process within the 2-year deadline. The razorback sucker was proposed for listing as a threatened species on April 24, 1978 (43 FR 17375). The proposal was withdrawn on May 27, 1980 (45 FR 35410), in accordance with 1978 amendments to the Act. On March 15, 1989, the Service received a March 14 petition from the Sierra Club, National Audubon Society, The Wilderness Society, Colorado Environmental Coalition, Southern Utah Wilderness Alliance, and Northwest Rivers Alliance to list the razorback sucker as an endangered species. The Service made a positive finding in June 1989 and subsequently published a notice on August 15, 1989 (54 FR 33586). This notice also stated that the Service was completing a status review and was requesting that additional information be provided by December 15, 1989. A proposed rule to list the razorback sucker as an endangered species was published on May 22, 1990 (55 FR 21154), and a final rule listing the fish without critical habitat was published on October 23, 1991 (56 FR 54957). In the