The c olumbian sharp-tailed grouse (Tympanuchus phasianellus columbianus) is an endangered species in Washington. The population size of Columbian sharp-tailed grouse in Washington is low. The statewide population of this grouse species is distributed in seven subpopulations that are not sustainable. Shortages of nesting, brood rearing, and wintering habitats are important factors limiting population recovery. Maintaining the species in Washington will require restoring habitat and increasing populations.
Habitat concentration areas (HCAs) are defined as significant habitat areas that are expected or known to be important for focal species based on survey data or habitat association modeling(WHCWG 2012). HCAs provide locations from which to model linkages. Additional masked occurence data supplied by the Washington Department of Fish and Wildlife was merged to the HCA data set by Conservation Biology Institute.