Unit 39

Major peaks including Blizzard Mountain, Greylock Mountain, Snowyside Peak, and Plummer Peak serve as navigation anchors and glassing vantage points across the high country. The watershed divide itself acts as the primary navigation corridor, with China Basin providing a notable basin for reconnaissance. Spangle Lake, Plummer Lake, and Surprise Lake mark water sources in the high country.

Atlanta Hot Springs and Chattanooga Hot Spring offer reference points on the western slope. These landmarks are spread across steep terrain—they're best used for distant observation and route planning rather than easy day-hike destinations.

The unit spans a significant vertical relief, climbing from around 5,000 feet in lower drainages to peaks exceeding 10,500 feet. Most terrain sits in the 8,000-10,500 foot band—true alpine and subalpine country where scattered whitebark pine, limber pine, and alpine tundra dominate the highest ridges. Mid-elevations feature moderate timber coverage of Douglas-fir and lodgepole pine mixed with open parkland and rocky scree fields.

Lower valleys transition to thicker forest. The steep topography means terrain breaks into narrow ridges, deep ravines, and cliff systems—classic mountain goat country where elevation changes happen fast over short distances.

The unit contains 179 miles of roads, mostly Forest Service routes ranging from rough tracks to improved gravel. Access points anchor near Ketchum on the west and Highway 21 on the north, with secondary approaches via Anderson Ranch Dam Road. However, road density is misleading—these routes access valleys and lower slopes; reaching alpine terrain requires substantial foot travel.

Terrain complexity of 7.9/10 reflects the steep, broken country that slows movement. Most hunting pressure concentrates near road-accessible drainages. Goat hunters willing to push into remote ridgebacks encounter far less competition and better glass opportunities.

Unit 39 encompasses portions of Ada, Boise, and Elmore counties, centered on the watershed divide where the Middle and South Forks of the Boise River split off toward opposite directions. The unit's western boundary runs from State Highway 21 near Interstate 84, follows Anderson Ranch Dam Road and the Camas-Blaine county line, then sweeps southeast through high country before anchoring at Ketchum on the western slope. The southern and eastern boundaries trace the South Fork Boise River-Camas Creek watershed divide.

This moderate-sized unit captures some of the most rugged terrain in the Boise National Forest system, sitting well above the valley floor.

Water sources are limited and critical for planning. High-elevation lakes—Spangle, Plummer, Surprise, Triangle, and Timpa—provide seasonal water near the ridgetops, though reliability varies. Lower elevations contain more dependable streams: Right Creek, Rock Creek, Scenic Creek, and South Fork Corbus Creek drain the unit toward the Boise River.

The South Fork Boise River itself forms the southwestern boundary. Most goat hunting occurs well above these drainages at elevations where snow patches and seeps sustain small populations. Hunters relying on water from lower elevations face significant elevation loss and regain.

Unit 39 is specialized mountain goat terrain requiring glassing-focused tactics from high vantage points. Hunt the ridgetops and cliff systems where goats utilize escape terrain; glass distant slopes from passes and peaks using quality optics. Early season provides better access to high country before snow; late season can be extremely challenging in alpine conditions.

Move slowly, scan methodically, and plan routes that minimize skyline exposure. The steep terrain means goats often retreat to cliff faces quickly—long-range glassing and careful stalk planning are essential. This isn't walk-and-glass country; it's ridgeline-to-ridgeline work in terrain that tests fitness and patience.