Description: We, the U.S. Fish and Wildlife Service (Service), designate critical habitat for the Gunnison sage-grouse (Centrocercus minimus) under the Endangered Species Act (Act). In total, approximately 1,429,551 acres (ac) (578,515 hectares (ha)) are designated as critical habitat in Delta, Dolores, Gunnison, Hinsdale, Mesa, Montrose, Ouray, Saguache, and San Miguel Counties in Colorado; and in Grand and San Juan Counties in Utah. The effect of this regulation is to conserve Gunnison sage-grouse habitat under the Act.