Unit 341

Key navigation features include the Madison and Gallatin ranges, with prominent summits like Gallatin Peak, Coffin Mountain, and Elephant Head Mountain providing orientation. Spanish Peaks offer distinctive visual landmarks. Major valleys—Bear Trap Canyon, Yankee Jim Canyon, and Cherry Creek Canyon—serve as drainage corridors.

Hebgen Lake and Hyalite Reservoir provide water references. Notable passes including Targhee, Lulu, Windy, and Mill Creek offer high-country routes. The Slough Creek-Boulder River Divide, Hellroaring Creek corridor, and Boulder River system define eastern boundaries and internal navigation.

The unit spans from roughly 4,000 feet in lower valleys to alpine terrain above 12,600 feet, with the median around 7,200 feet. Low-elevation areas along the Gallatin River and Mission Creek corridor feature sagebrush-grassland terrain transitioning to ponderosa and mixed conifer forests on mid-elevation slopes. Higher elevations support dense spruce-fir stands, with subalpine parks and meadows in basins like Hilgard, East Baldy, and Newell.

The highest ridges and peaks support alpine vegetation and persistent snowfields. Glaciers including Sky Top, Castle Rock, and Wolf Glacier occupy high basins.

Over 5,200 miles of roads traverse the unit, but actual road density varies dramatically by area. I-90 and Highway 287 provide arterial access on the periphery. Bear Canyon Road, Sourdough Canyon Road, Nash Road, and scattered Forest Service roads penetrate interior valleys, but extensive trailhead-only country remains in the high basins and ridge systems.

Popular access points cluster near Livingston, Bozeman, and West Yellowstone. The unit's terrain complexity and distance create natural relief from pressure in upper basins and ridge country, though lower valleys and accessible drainages see consistent use.

Unit 341 covers portions of Gallatin, Madison, Park, Carbon, and Sweetgrass counties, bounded by the Montana-Wyoming border on the south, the Continental Divide and Idaho border on the west, Interstate 90 on the north, and the Custer-Gallatin National Forest on the east. The unit encompasses the Madison Range, Spanish Peaks, and Gallatin Range as major geographic anchors. Livingston and Three Forks serve as primary access points via I-90 and US 287. The boundary traces through Yellowstone National Park's northern edge, incorporating some of the highest, most remote terrain in southwestern Montana.

The Gallatin River runs along the western boundary; the Yellowstone River defines the northern edge near Livingston. Major interior drainages include the Boulder River system, Slough Creek, Mill Creek, and Bear Creek. Hebgen Lake and Hyalite Reservoir provide reliable water sources.

Numerous springs are scattered throughout—Wolf Creek Hot Spring, Langohr Springs, and Snowflake Springs among them. High-elevation lakes including Expedition, Sheep, Snake, and Little Sister lakes offer water access in remote basins. Seasonal snowmelt sustains high-country creeks; lower-elevation water sources become marginal by late summer.

Unit 341 supports black bears across its elevation spectrum. Lower-elevation drainages—Bear Trap Canyon, Yankee Jim Canyon, and the Gallatin River corridor—offer spring and fall opportunities in sagebrush and transition zones where bears forage on carcasses and emerging vegetation. Mid-elevation draws and creek bottoms with berry production attract bears mid to late summer.

High-elevation basins and slopes above 8,000 feet concentrate bears in late summer and fall near huckleberry fields and other alpine food sources. Glassing from ridge systems works for spotting; horseback access or foot traffic through drainages suits spring hunting. The unit requires commitment—accessible areas see pressure, but elevation relief and basin complexity reward thorough scouting and willingness to gain elevation.