Included on the Ultimate USA Cutthroat Map, plus PDFs and KMZs providing additional information are available from the download system.
The Westslope Cutthroat Trout is one of the most widely distributed cutt variants, with pockets still surviving in Washington and Oregon, and the main distribution covering a large swathe across the western slope of the Rockies in Idaho and Montana.
The Westslope Cutt is protected as a threatened species over much of its range, and its status is reviewed regularly (minimum every 5 years) by state and Federal agencies cooridinating its preservation. The data in the Ultimate USA Cutthroat Map is drawn principally from the 2009 Assessment GIS dataset, which is distributed without restrictions on its use. The data includes information about abundance, genetic purity, and habitat. Core Conservation Populations are depicted as dark red, Conservation Populations as bright red, and streams where cutthroat are present (but not managed as conservation populations) are pink.
Above: Westslope cutthroat trout 2009 status assessment, Montana Fish, Wildlife & Parks, Fisheries Division and National Geographic (basemap)
Below: Same dataset on a USGS Nat Map basemap, zoomed in to Level 14