2020 Map of Eureka Basin

About this map

Beaverhead National Forest defines this high-elevation landscape where the Gravelly Range straddles the border of Madison and Beaverhead counties. This 2020 topographic survey traces a vital watershed divide in Southwest Montana, where headwater streams like the Ruby River flow westward while the West Fork Madison River drains to the east. The terrain is characterized by the Eureka Basin, a central geographic feature accessed by the winding Eureka Basin Rd. Water sources are critical in this alpine environment, noted by Long Creek Spring Number One, Lone Willow Spring, and Twin Springs. For researchers and outdoorsmen, the map identifies specific landmarks like Fish Creek Lake and the high-altitude route of the Gravelly Range Rd, documenting the contemporary management and natural geography of these public lands.