This U.S. Geological Survey (USGS) data release provides a digital geospatial database for the geologic map of the eastern part of the Challis National Forest and vicinity, Idaho (Wilson and Skipp, 1994). Attribute tables and geospatial features (lines and polygons) conform to the Geologic Map Schema (USGS NCGMP, 2020) and represent the geologic map as published in U.S. Geological Survey (USGS) Miscellaneous Investigations Series Map I-2395 (Wilson and Skipp, 1994). The database represents the geology for the 2.7-million-acre map plate at a publication scale of 1:250,000. The map covers primarily Butte, Custer, Lemhi and Blaine Counties, but also includes minor parts of Clark County. References: U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic maps: U.S. Geological Survey Techniques and Methods, book 11, chap. B10, 74 p., https://doi.org//10.3133/tm11B10. Wilson, A.B., and Skipp, Betty, 1994, Geologic map of the eastern part of the Challis National Forest and vicinity, Idaho: U.S. Geological Survey, Miscellaneous Investigations Series Map I-2395, scale 1:250,000, https://ngmdb.usgs.gov/Prodesc/proddesc_10267.htm.