Included on the Ultimate USA Cutthroat Map, plus PDFs and KMZs providing additional information are available from the download system.
Bonneville cutts (“BVCT”) have a fairly limited distribution, principally in north-central Utah (not far from Salt Lake City and Provo), southern Idaho (SE of Pocatello), and southwestern Wyoming. There are isolated populations in southern Utah, and eastern Nevada.
There is less information available about BVCT than most other cutthroat variants, most likely because Utah successfully resisted listing them as “threatened” under the endangered species act (most recently in 2008), so that the Federally funded (public domain) conservation reporting is not required. The latest, really comprehensive document about BVCT is a 2004 Range-Wide Status report published by the Utah Division of Wildlife Resources. This has largely disappeared from public view as it (uniquely) is no longer distributed on the UTDWR website. It appears, however, to be the primary source of all subsequent information that we’ve found, including the 2008 Threatened Species Petition and the Idaho Streamnet distribution maps.
The Ultimate USA Cutthroat Map renders the maps and some of the population information provided in the appendixes of this report into a vector dataset. Streams are designated as CorePops (genetically unaltered, dark purple), ConPops (somewhat hybridized, but considered valuable, medium purple), and CTpresent (hybridized) populations. A KML containing the same dataset, with even more comprehensive information, is available from the download system.
Source: WildTroutStreams, UTDWR, basemap USGS National Map Topo