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Threatened, Endangered, and Sensitive (fES) Species' NabimtAssessment Survey TABLE 1: FEDERALLY-LISTED SPECIES POTEIVTIALLY OCCURRING IN GUNNISON COUNTY, COLOIRADO Common Name Scientific Name Status BIItDS Gunnison sae ouse Centrocercus minimal Candidate Yellow-billed cuckoo Coc zus americanus Candidate Bald ea le Haliaeetus leucoce hal:~s Threatened MAMMALS Canada 1 L nx canadensis Threatened INVERTEBRATES Uncom ah e fritilla butterfl Boloria acrocnema Endan eyed AMPHII3LINS Boreal toad Bu o boreal boreal Candidate FISH Hum back chub Gila c ha Endan eyed Bon it chub Gila ele ans Endan ered Colorado ikeminnow P chocheilus luaus Endan ered Razorback sucker X rouchentexanus Endan ered The Gunnison sage grouse was officially listed as a candidate species by the USFWS on December 28, 2000 (USFWS, 2000a). The known breeding population size is small (less than 4,000 individuals) with the lazgest population (2,000 to 3,000 individuals) occurring in Gunnison and Saguache counties, Colorado (BLM, 20046). Gunnison sage grouse require a variety of habitats associated within or near big sagebrush communities. They require big sagebrush for leks, nesting, and winter habitat, and riparian areas within 165 feet of big sagebrush for brood- rearing habitat (BLM, 20046). No suitable habitat is present within, or neaz, the Project Area for Gunnison sage grouse. No effects to this species are anticipated as a result of this project. The yellow-billed cuckoo was added to the USFWS's candidate species list upon publication of the 12-month petition finding on July 25, 2001 (USFWS, 2001). It is an uncommon local summer resident in western valleys, primarily from Mesa County southward (CDOW, 20046). Yellow- billed cuckoos are known to breed in dense willow and cottonwood stands in river floodplains, and breeding coincides with the emergence of cicadas and tent caterpillars (USFWS, 2004c). No suitable habitat is present within the Project Area for yellow-billed cuckoo. No effects to this species are anticipated as a result of this project. The bald eagle, originally listed as endangered by the USFWS on March 11, 1967 and subsequently reclassified as threatened on August 1 I, 1995, wtls proposed for removal from the list of endangered and threatened wildlife on July 6, 1999. The bald eagle ranges throughout most of North America, and is known to frequent estuaries, large lakes, reservoirs, major rivers, and some seacoast habitats (USFWS, 1999). In Colorado they are often found near reservoirs, especially where there aze abundant fish (CDOW, 2004c). Since no preferred nesting habitat or forage sources are present within the Project Area, bald eagle utilization is unlikely. No effects to this species are anticipated as a result of this project. The Canada lynx was officially listed as a threatened species bar the USFWS on March 24, 2000 (USFWS, 20006). The Colorado Division of Wildlife (CDOW), administrator of the Canada lynx reintroduction program, released 37 lynx (17 females and 20 males) in southwest Colorado in 1838-Oxbow_TES Survey_(10.25.04).doc