Unit 300

The Tendoy Mountains provide the western spine and dominant landmark system, with peaks like Medicine Lodge Peak, Graphite Mountain, and Sourdough Peak serving as excellent glassing reference points. Clark Canyon Reservoir anchors the eastern boundary and is visible for miles—a critical navigation feature. Muddy Hole Basin in the central area is a logical staging zone for hunters.

The Trail Creek-Lemhi Pass Road (USFS 3909) forms the western access corridor and provides the primary entry into the unit. Harkness Lakes and Poison Lakes offer water reference points in the high country. Big Sheep Creek drainages are major navigation corridors that funnel movement through the unit.

Four Eyes Canyon provides southern-basin access. These features form a network hunters can use to plan routes and understand the country's structure.

The unit spans roughly 5,500 to 11,000 feet, with most productive hunting occurring in the 7,000 to 9,000-foot band. Sagebrush basins dominate the lower elevations and open ridgetops, transitioning to sparse lodgepole and whitebark pine stands on north-facing slopes and higher terrain. Above 9,500 feet, timber becomes more continuous but remains relatively open.

The habitat pattern is distinctive—big sagebrush parks interspersed with scattered conifers rather than dense forest. Soils are thin, rocky, and prone to drought. Snow accumulation varies dramatically with aspect and elevation; south-facing slopes shed snow earlier and offer winter grazing for pronghorn.

The open nature of the terrain means weather and light create dramatic daily changes in visibility and glassing opportunity.

The unit has 848 miles of roads, though density metrics are unavailable; most routes are rough two-tracks and primitive forest service roads. Route 324 and USFS Road 3909 (Trail Creek-Lemhi Pass) are the primary corridors. Fair accessibility means the unit attracts moderate pressure but isn't overrun—the high-country terrain and limited water naturally disperse hunters.

Most pressure likely concentrates near main road corridors and established camping areas near Muddy Hole Basin. The western border near Lemhi Pass sees Idaho overflow traffic during their seasons. Interstate 15 at Dell provides easy access from the north, which can funnel hunters into the unit despite the rough roads beyond.

Early-season and weekday hunting offers genuine solitude in the expansive basin country.

Unit 300 encompasses the western portion of Beaverhead County, bounded by Clark Canyon Dam on the east and the Montana-Idaho border to the west. The unit sprawls across roughly 600+ square miles of high-elevation country between Interstate 15 at Dell on the north and the Pine Creek-Little Sheep Creek divide near Bannock Pass on the south. Big Sheep Creek drains the central corridor, serving as a key geographic anchor.

The landscape is defined by the transition from the Tendoy Mountains eastward into rolling basin country, with most land sitting above 6,500 feet. This is the kind of country that takes time to learn—terrain complexity runs high, and navigation requires careful attention to drainages and ridge systems.

Water is the limiting factor in this unit. Reliable year-round sources are scattered and seasonal. Clark Canyon Reservoir is permanent but on the unit's eastern edge.

Springs—Rock Spring, Graphite Spring, Burnt Fork Spring, Sourdough Spring, Johnson Spring, Bear Canyon Spring, and several others—are present but not uniformly distributed. High-elevation lakes including Harkness, Poison, Morrison, and Deadman lakes provide late-summer water but are snow-covered much of the year. The major creeks—South Frying Pan, Maiden, Harkness, and Sawlog—are seasonal runners; flow drops dramatically by mid-summer.

Hunters must plan routes and timing around water availability. Early season and spring hunts benefit from snowmelt; late summer requires knowledge of reliable springs or long hiking between water sources.

Unit 300 is pronghorn country. The open sagebrush basins and rolling terrain are ideal for the glassing-and-stalking approach antelope demand. Plan hunting around water sources—early season when snowmelt and spring flow are adequate offers the best movement and visibility.

Mid to late summer requires concentrating on known spring areas and lakes, as pronghorn will be forced to reliable water in the high basins. The sparse timber offers limited cover; success depends on learning pronghorn movement patterns relative to wind, understanding which basins hold animals, and executing stalks in open country. Big Sheep Creek drainage and the central basins are natural travel corridors.

The rolling terrain creates numerous benchmarks for glassing—hunters should identify high points offering views into multiple basins and plan systematic coverage rather than random wandering in this terrain complexity.