District 380, Montana

The Elkhorn Mountains rise as an isolated island range from the surrounding valley floor to elevations of approximately 3,743-9,400 ft, with the highest point at Crow Peak (9,414 ft) and nearby Elkhorn Peak (9,381 ft). Terrain is characterized by steep gulches and canyons, rounded and furrowed ridgelines, and granite outcrops in the northern and western portions (batholith rock), with sedimentary and calcareous rock underlying the southwest quarter, forming rugged hogback ridges. Valley floors surrounding the range contain farm ground and residential land at roughly 4,000 ft elevation, while the interior is mountainous and heavily timbered. The study area boundary spans approximately 2,600 km2 (1,004 sq mi).

The Elkhorn range sits within the Elkhorn Cooperative Management Area (ECMA), a collaborative interagency designation across Helena-Lewis and Clark National Forest (Helena and Townsend Ranger Districts, 44% of public lands), Bureau of Land Management (33%), Beaverhead-Deerlodge National Forest (15%), and State of Montana (8%). Public lands make up approximately 46% of the study area core, with private lands (54%) concentrated on the periphery. Primary motorized access into the mountains is via Montana Highway 69 from Boulder (south from Helena), with Forest Service Road #258 departing Hwy 69 approximately 6 miles south of Boulder. Weasel Creek Road #405 provides trailhead access to Crow Creek Trail #109 (leading to Crow Creek Falls). Within National Forest lands, a Motor Vehicle Use Map governs which roads and trails are open to motorized travel; seasonal closures (fall through spring) protect elk on winter range. The interior of the range is managed for walk-in access with motorized hunting limited to the periphery. FWP Block Management Program provides access to private land within and adjacent to the range (approximately 100,000 acres enrolled circa 2010). The district includes two weapons restriction areas: the Muskrat Valley Weapons Restriction Area and the Townsend Weapons Restriction Area.

Lower elevations are dominated by open sage-grassland (big sagebrush, bluebunch wheatgrass, Idaho fescue, rough fescue, bluegrasses) with patches of Rocky Mountain juniper and Douglas fir. Upper elevations support dry coniferous forests of lodgepole pine, Douglas fir, and ponderosa pine, with small interspersed meadows, aspen groves, and alpine lakes near the summits. Since 2005-2012, a severe mountain pine beetle epidemic affected approximately 1,655 km2 (64%) of the range with tree mortalities approaching 90 percent in some areas, significantly altering forest structure and creating large stands of standing dead timber transitioning to blowdown. The 1988 Warm Springs Fire previously burned approximately 44,500 acres, resulting in lodgepole regeneration of varying successional stages.

Elk are the district signature species, with a stable population averaging approximately 1,961 animals (range 1,700-2,300 per management objective), monitored annually by MFWP aerial survey across 10 semi-distinct Elk Herd Units. The herd supports all age classes of bulls up to 15 years old due to the spike-only general regulation in place since 1987. Mule deer are widely distributed throughout the district; white-tailed deer also occur, particularly in valley-bottom and lower-elevation habitat. A small bighorn sheep population historically occupied the range but suffered a catastrophic pneumonia die-off in 2009 that killed approximately 90 percent of a 220-animal herd; recovery status as of 2026 is uncertain. Black bear and mountain lion are resident predators; GPS collar research (2015-2018) documented 3 instances of mountain lion predation on collared female elk, representing 17% of female elk mortalities. Moose occupy the Elkhorn study region and adjacent areas. Gray wolves occasionally traverse the district.