Boise National Forest, Idaho | Est. 1908

The Forest

Boise's Backyard — Idaho's Central Wilderness

Boise National Forest was established on July 1, 1908 by President Theodore Roosevelt — carved from portions of the original Sawtooth, Payette, and Weiser Forest Reserves to protect timber and watershed resources in southwestern Idaho. The forest was named for the Boise River, whose name derives from the French word for "wooded" — fitting for a landscape dominated by ponderosa pine.

Today it encompasses 2,203,703 proclaimed acres across six Idaho counties — Ada, Boise, Elmore, Gem, Valley, and Washington — making it one of the largest national forests in the American West. The forest stretches from the high-desert foothills of the Snake River Plain at roughly 2,800 feet to the granite peaks of the Boise Mountains at 9,730 feet on Steel Mountain. The USFS homepage describes it as spanning "North Fork Payette River Canyon at 2,800 feet in elevation to the nearly 10,000 foot peak of Trinity Mountain."

The geological foundation is the Idaho Batholith — specifically the Atlanta Lobe, a Cretaceous-Paleogene mass of granite and granodiorite covering over 9,700 square miles across Idaho and Montana. This batholith forms the forest's Boise, Salmon River, and West mountain ranges. It is geographically distinct from the Bitterroot Lobe to the north. More than 9,600 miles of streams and rivers and 250+ lakes and reservoirs flow through its terrain — one of the most water-rich national forests in the lower 48. Wikipedia →

USFS Headquarters: 1249 S. Vinnell Way, Suite 200, Boise, ID 83709
Idaho City Ranger District: 3833 Highway 21, Idaho City, ID 83631 · 208-392-3700 · Mon–Fri 8am–4:30pm
Official Site: fs.usda.gov/r04/boise

5 Ranger Districts

Cascade (400k+ ac), Emmett (350k ac), Idaho City (400k+ ac), Lowman, and Mountain Home (650k ac — southernmost). fs.usda.gov/r04/boise/recreation →

Steel Mountain — 9,730 ft

Highest point in Boise National Forest. Located in Elmore County in the Boise Mountains. Second highest point in the range, with 2,188 ft of prominence. Class 2 scramble. Wikipedia →

Two Wilderness Areas

Portions of both the Frank Church–River of No Return Wilderness (2,366,757 ac — largest contiguous in lower 48) and the Sawtooth Wilderness (217,088 ac) fall within BNF boundaries.

Boise River Watershed

The Boise River originates in the Sawtooth Range and flows west through the forest. Its watershed provides approximately 30% of Boise's drinking water and irrigates over 300,000 acres of farmland. Four downstream dams manage the system: Arrowrock (1915), Anderson Ranch (1950), Lucky Peak (1955). American Rivers →

Five Ranger Districts

From Long Valley to the High Desert

Each district manages a distinct landscape — from the world-class kayaking of the North Fork Payette to the geothermal corridors of Highway 21. Together they cover over 2.2 million acres of Idaho's most accessible backcountry.

Northernmost · 400,000+ Acres

Cascade Ranger District

Located ~75 miles north of Boise on Highway 55. Long Valley between the North Fork Payette River (world-class kayaking) and Cascade Lake and the South Fork Salmon River — two of Idaho's top fisheries. Primary BNF gateway into the western portions of the Frank Church–River of No Return Wilderness via Snowshoe Summit and Pistol Creek. Summer: boating, fishing, ATV trails. Year-round recreation. Recreation.gov reservations →

USFS Cascade District

350,000 Acres · Hot Springs

Emmett Ranger District

350,000 acres with more than 150 camping units in 21 developed campgrounds, 150+ trail miles for motorized and non-motorized use, 3 rental cabins, and five hot springs near established trails and campgrounds. Middle Fork Payette River fishing; Silver Creek Campground; Boiling Springs Campground north of Garden Valley. North Fork Payette River white water accessible at Big Eddy Campground (~15 miles north of Banks on Hwy 55 at 4,000 ft).

USFS Emmett District

Highway 21 Corridor · 400,000+ Acres

Idaho City Ranger District

The spine of the Ponderosa Pine Scenic Byway experience. District office at 3833 Highway 21, Idaho City (208-392-3700). The Boise Basin Experimental Forest (est. 1933, 8,740 acres) studies ponderosa pine management near Idaho City. Whoop-em Up Equestrian Campground. Gold panning on Bannock Creek. Bald Mountain Campground near Idaho City; Middle Fork Boise River access.

USFS Idaho City District

Kirkham Hot Springs · Bear Valley

Lowman Ranger District

Home of Kirkham Hot Springs — geothermal pools and steaming waterfalls at the South Fork Payette River at 4,000 ft elevation, $5 day use per vehicle (USFS page →). Deadwood Reservoir (fishing, camping, motorized and non-motorized trails). Bull Trout Lake — Bull Trout Lake Campground (equestrian). Bear Valley Creek — headwater stream for the Middle Fork of the Salmon River. Wildlife Canyon Scenic Byway (Banks-Lowman Hwy) accessed at Banks on Hwy 55; many hot springs en route.

USFS Lowman District

Southernmost · 650,000 Acres

Mountain Home Ranger District

Largest district. Terrain transitions from desert sagebrush at lower elevations through ponderosa pine and Douglas-fir to high alpine at 9,700 ft. 20+ lakes, 4 major reservoirs, 53 recreation sites. Bogus Basin Mountain Recreation Area operates under special use permit — 2,600 skiable acres, 7,582 ft summit, 90 runs, 10 lifts, 250 in. average snowfall, 165 acres of night skiing, non-profit operated. bogusbasin.org → Arrowrock Reservoir boat ramp and dam access.

USFS Mountain Home District

Living Ghost Town · NRHP

Atlanta, Idaho

Remote living ghost town at 5,800 ft, founded 1864 as a gold and silver mining settlement. Ten-acre historic district, 10 buildings on the National Register of Historic Places. Situated along the Middle Fork Boise River at the base of Sawtooth Wilderness and Greylock Mountain (9,363 ft). Multiple hot springs on the river: Twin, Smith Cabins, Loftus, Powerplant, Chattanooga. Rental cabin at the historic Atlanta Guard Station bookable through Recreation.gov → Access requires 4WD high-clearance vehicle on unpaved forest roads.

Wikipedia — Atlanta, Idaho

Wilderness

Two of America's Greatest Wilderness Areas

Boise National Forest hosts portions of both the largest and most iconic designated wilderness areas in Idaho — one to its north and one to its east. No other national forest in the lower 48 borders both simultaneously.

Largest Contiguous Wilderness — Lower 48

Frank Church–River of No Return Wilderness

2,366,757 acres — the largest contiguous wilderness area in the contiguous United States. Named for Idaho Senator Frank Church, who announced his 1976 presidential candidacy from the Boise County Courthouse in Idaho City — his grandfather settled Idaho City in 1871, his father was born there in 1889. The Cascade Ranger District (northernmost BNF district) is the primary access point from the Boise National Forest into the Frank Church's western reaches, via Snowshoe Summit and Pistol Creek. The Middle Fork of the Salmon River — one of America's premier whitewater and backcountry corridors, class III–IV+, internationally recognized — originates from Bear Valley Creek in the Lowman Ranger District before entering the wilderness. frankchurchwilderness.org →

Wikipedia →

Est. 1972 — 217,088 Acres

Sawtooth Wilderness

The eastern edge of Boise National Forest merges with the Sawtooth Wilderness — 217,088 acres of glacially carved granite spires and alpine lakes jointly administered with Sawtooth National Forest. The Atlanta area of the Idaho City Ranger District sits at the foot of the Sawtooth Wilderness boundary — Greylock Mountain (9,363 ft) visible from the Atlanta cabin porch. Wildlife: black bear, Rocky Mountain elk, mule deer, grey wolf, mountain goat, lynx, wolverine. Fish: bull trout, cutthroat, chinook and sockeye salmon. The Boise National Forest's eastern boundary is the western edge of the Sawtooth — these two public land systems are physically contiguous. sawtoothnationalforest.org →

Wikipedia →

Ecology & Biology

Endemic, Imperiled, and Irreplaceable

Three-quarters of Boise National Forest's land surface is covered in coniferous forest: Douglas fir, ponderosa pine, lodgepole pine, subalpine fir, whitebark pine, Engelmann spruce, grand fir, western larch, and quaking aspen. The ecological designation is the Idaho Batholith ecoregion — a distinct inland mountain zone shared with portions of western Montana.

The forest's most extraordinary biological distinction: it contains approximately 75% of all known global populations of Lewisia sacajaweana — Sacajawea's bitterroot. This small flowering plant is endemic to Idaho, known from roughly two dozen sites, and classified as Imperiled by NatureServe. It grows at elevations from 5,000 to 9,500 feet and produces white flowers shortly after snowmelt. Wikipedia →

Before European contact, the forest was inhabited by the Shoshone, Bannock, Northern Paiute, and Nez Perce — archaeological evidence includes rock shelters, campsites, burial grounds, and pictographs along the rivers. Today, the Shoshone-Paiute, and Nez Perce Tribes continue to exercise off-reservation treaty rights including fishing, hunting, and plant gathering within the forest. National Forest Foundation →

Sacajawea's Bitterroot — Lewisia sacajaweana

Endemic to Idaho. ~75% of known global populations in BNF. Elevations 5,000–9,500 ft. White flowers after snowmelt. Conservation status: Imperiled (NatureServe). Wikipedia →

Major Wildlife Species

Elk, mule deer, black bear, mountain lion, moose, grey wolf, coyote, pika, yellow-bellied marmot, lynx, wolverine, chukars, wild turkeys, bald eagles. Rocky Mountain elk and mule deer viewable on the Wildlife Canyon Scenic Byway, especially winter months.

Boise Basin Experimental Forest

Established 1933. 8,740 acres near Idaho City. Long-term research on ponderosa pine management, wildfire, soils, and vegetation trends. Idaho City was a booming mining town in the 1870s — post-mining ponderosa regeneration is the dominant story of these units today. USFS Research →

National Interagency Fire Center

Located in Boise, Idaho — coordinates wildfire resources nationally. BNF management is closely linked to NIFC wildfire research and response infrastructure. The Boise Basin Experimental Forest and BNF are field-testing environments for NIFC-coordinated fire ecology research.

Gateway Communities & Access

Ways In From Every Direction

Idaho City is the primary gateway on Highway 21 — the county seat of Boise County, founded 1862, and once the largest city in the Pacific Northwest. The Idaho City Ranger District office sits at 3833 Highway 21 (208-392-3700). All Hwy 21 travel to the Sawtooth Valley, Lowman, and the SNRA passes directly through Idaho City. idahocity.org →

Garden Valley lies along the South Fork Payette River in Boise County — the last community before the climb to Lowman and the Kirkham Hot Springs corridor on the Wildlife Canyon Scenic Byway. Access via Banks on Hwy 55, then east on the Banks-Lowman Highway. gardenvalleyidaho.org →

Cascade (on Hwy 55, ~75 miles north of Boise) is the gateway for the northernmost Cascade Ranger District and the Frank Church western approaches. Boise itself — the forest headquarters and the largest city adjacent to a national forest in the U.S. — is the main urban access point. Take Hwy 21 northeast for Idaho City and the Ponderosa Pine corridor, or Hwy 55 north for Banks, Garden Valley, and Long Valley.

From Stanley and the Sawtooth Valley: enter via Hwy 21 heading southwest — you cross into Boise National Forest at Lowman and travel through the full Hwy 21 corridor to Idaho City and Boise. The Ponderosa Pine Byway connects all the way from Boise through Idaho City, Lowman, and into the SNRA at Stanley — the complete High Country highway.

fs.usda.gov/r04/boiseOfficial USFS Boise National Forest site — all five districts
Recreation.gov — Boise NF CampgroundsReserve developed campsites, day use, and cabin rentals
National Forest Foundation — Boise NFConservation partner — Rivers to Peaks program, forest history
Wikipedia — Boise National ForestEncyclopedic reference — history, districts, ecology, geology
Bogus Basin Mountain Recreation AreaNon-profit ski area on BNF — 2,600 acres, year-round recreation
Idaho CityPrimary gateway · Boise County seat · Ponderosa Pine Byway · idahocity.org
Garden ValleySouth Fork Payette corridor · Wildlife Canyon Byway gateway
Boise Standard Entity RecordProvenance record for boisenationalforest.org in the Boise Standard graph

Regional Network

Boise National Forest in the Idaho Wilderness Corridor

BNF is the western anchor of Idaho's contiguous public land corridor — bordered by the Frank Church to the north, the Sawtooth to the east, and the Treasure Valley to the south and west.

Knowledge Authority

Boise Standard

Regional knowledge network and provenance infrastructure for the Boise Basin and greater Idaho. 1,025,420+ entity corpus. Entity record for this site at boisestandard.org/web/boisenationalforest-org.

boisestandard.org

Primary Gateway

Idaho City

County seat of Boise County, est. 1862. Once largest city in the Pacific Northwest. 40 miles NE of Boise on Hwy 21. Idaho City Ranger District office. Boise Basin Experimental Forest. Gold rush history.

idahocity.org

Adjacent County

Boise County

Most of the Ponderosa Pine Scenic Byway and the Lowman District corridor falls within Boise County. Garden Valley and Idaho City are both Boise County communities. Est. 1864.

boisecounty.org

River Community

Garden Valley

South Fork Payette River corridor community in Boise County. Boiling Springs Campground (Emmett RD) just north. Last stop on the Wildlife Canyon Scenic Byway before Lowman and Kirkham Hot Springs.

gardenvalleyidaho.org

Northern Wilderness

Frank Church Wilderness

Largest contiguous wilderness in the lower 48 — 2,366,757 acres. BNF's Cascade District is the primary western gateway. Middle Fork Salmon headwaters originate in BNF Bear Valley before entering the Frank Church.

frankchurchwilderness.org

Eastern Neighbor

Sawtooth National Forest

Adjacent forest to the east. The Sawtooth Wilderness is co-administered across BNF and SNF boundaries. The Ponderosa Pine Byway (Hwy 21) connects BNF to the SNRA at Stanley. Est. May 29, 1905.

sawtoothnationalforest.org

Federal · USFS

Official USFS Site

Permits, closures, campground reservations, district contacts, trail conditions for all five ranger districts. Current fire restrictions and seasonal road conditions. fs.usda.gov/r04/boise.

fs.usda.gov/r04/boise

Conservation

National Forest Foundation

Rivers to Peaks program supports Boise National Forest river and watershed restoration. Publishes accessible forest guides, history, and recreation information for the Boise NF.

nationalforests.org

Boise
National Forest