Idaho's Spine of Granite and Sage

The Sawtooth Scenic Byway runs 116 miles up the spine of south-central Idaho, climbing from the sagebrush plains of the Snake River country at Shoshone (3,963 ft) through the Wood River Valley resort towns of Hailey, Ketchum, and Sun Valley to the headwaters of the Salmon River at Stanley (6,253 ft). ID-75 follows the Wood River north, threading between the Pioneer Mountains to the east and the Smoky Mountains to the west, before crossing the Continental Divide watershed at Galena Summit (8,701 ft) and descending into the Stanley Basin, where the jagged granite teeth of the Sawtooth Range rise abruptly from the valley floor to over 10,700 feet. The Sawtooths, named in 1864 by gold prospector Levi Smiley for their resemblance to the cutting teeth of a saw, contain more than 50 peaks over 10,000 feet and over 300 alpine lakes, all enclosed within the 756,000-acre Sawtooth National Recreation Area, established in 1972 and one of the most pristine wilderness landscapes in the lower 48. The byway passes through the heart of America's first destination ski resort: Sun Valley, opened in 1936 by Union Pacific Railroad chairman Averell Harriman, who hired Austrian Count Felix Schaffgotsch to scout the West for a Swiss-style resort site. The resulting Sun Valley Lodge drew Ernest Hemingway, who wrote portions of For Whom the Bell Tolls here and is buried in the small Ketchum cemetery north of town, along with Gary Cooper, Marilyn Monroe, and a parade of Hollywood royalty who shaped the resort's mid-century identity. The byway then climbs into the granite-and-aspen high country, crests Galena, and reveals one of the most photographed mountain panoramas in the United States: the Sawtooth Range rising abruptly from the rolling meadows of the Stanley Basin, with the headwaters of the Salmon River winding through.

Key Stops

Shoshone The byway's southern starting point, an old railroad and mining town just off US-93 north of Twin Falls. Shoshone Ice Caves, 17 miles north of town on ID-75, are a series of lava tubes whose interiors maintain temperatures cold enough to hold a permanent floor of ice year-round. Self-guided tours run April through October (approximately $15 per adult). Mammoth Cave (a separate, larger lava tube nearby) is also open seasonally.

Magic Reservoir (Side Trip) A short detour west of ID-75 leads to Magic Reservoir, a 12-mile-long lake popular with anglers for rainbow trout, perch, and smallmouth bass. Open shoreline, primitive camping, and few crowds.

Bellevue, Hailey, and Carey Country A succession of small Wood River Valley towns, each with its own character. Bellevue is the smallest and most agricultural; in spring and fall, sheep herders move their flocks along the byway as part of the Trailing of the Sheep, a traditional migration commemorated in an October festival (drawing on Idaho's Basque and Peruvian shepherding heritage). Hailey is the largest, with full services, an active downtown, and the birthplace of poet Ezra Pound in 1885. The Wood River Trail (a 22-mile paved path between Bellevue and Ketchum) parallels much of the byway and is excellent for cycling.

Ketchum and Sun Valley The byway's centerpiece resort town at 5,800 feet, set among the Smoky and Boulder Mountains. Sun Valley, the resort, sits one mile northeast of Ketchum, the town. Sun Valley Lodge (opened December 1936) was America's first destination ski resort and introduced the world's first chairlift. The lodge is now a National Historic Landmark, with original 1930s woodwork, a heated pool that has run continuously since opening, and walls hung with photographs of Hemingway, Gary Cooper, Marilyn Monroe, and Norma Shearer. Bald Mountain (Baldy) rises west of Ketchum at 9,150 feet and offers some of the most consistent intermediate and expert skiing in North America in winter and summer chairlift rides for sightseers, hikers, and downhill mountain bikers. Hemingway lived in Ketchum from 1959 until his death in July 1961; his grave is in the modest Ketchum Cemetery on Main Street, marked by a flat granite stone often left with pennies and pen tips by visitors. Two Hemingway Memorials (one in Sun Valley, one near Trail Creek) honor him with bronze plaques bearing his eulogy for a friend. Ketchum has excellent restaurants, galleries, and the Sun Valley Music Festival (free orchestral concerts in summer).

Sawtooth National Recreation Area Headquarters Eight miles north of Ketchum on ID-75, the SNRA headquarters offers maps, exhibits, ranger information, and an introduction to the 756,000-acre recreation area. Free; the visitor center is open daily in summer. The SNRA contains the Sawtooth Wilderness (217,000 acres), the White Cloud Wilderness (90,800 acres, designated 2015), and the Hemingway-Boulders Wilderness.

Wood River Valley to Galena Summit The byway climbs gradually northward through aspen-fringed meadows and stands of lodgepole pine, with the Boulder Mountains rising to the east and the Smoky Mountains to the west. Several trailheads access alpine lakes including Easley, Russian John, and Baker Lakes. Galena Lodge, 23 miles north of Ketchum, is a historic stagecoach-era inn now operating as a Nordic ski lodge in winter and a mountain biking and hiking hub in summer with a cafe and rentals.

Galena Summit Overlook The byway crests at Galena Summit (8,701 ft) and, half a mile beyond, opens onto the Galena Overlook, one of the most spectacular roadside views in the western United States. The Sawtooth Range rises like a wall of granite teeth across the wide green Stanley Basin, the headwaters of the Salmon River wind through the meadows 2,000 feet below, and the Sawtooth Wilderness stretches west to the horizon. Interpretive panels explain the geology: the same glaciers that carved the U-shaped valley below also honed the sawtooth crests above.

Smiley Creek A small community along the byway with the Smiley Creek Lodge (a historic roadhouse and restaurant, now offering rooms, cabins, RV sites, and meals). Useful fuel stop on the long stretch between Ketchum and Stanley.

Alturas Lake A glacial lake at the foot of the Sawtooths, ringed by lodgepole pine and aspen, with a campground and short trail network. Less visited than Redfish Lake to the north. Excellent paddling and fishing for cutthroat trout. The historic mining town of Sawtooth City sits nearby in ruins.

Salmon River Headwaters and Sawtooth Fish Hatchery The byway descends from Galena, dropping 2,000 feet in five miles, and crosses the infant Salmon River, which begins at this elevation and flows 425 miles to its confluence with the Snake. The Sawtooth Fish Hatchery on the river's west bank raises Chinook salmon and steelhead, the last generation of fish whose ancestors have made the 900-mile run from the Pacific Ocean up the Columbia, Snake, and Salmon Rivers. Free interpretive displays explain the migration and the challenges salmon face from the eight major dams downstream.

Redfish Lake The crown jewel of the Sawtooth high lakes and one of the most photographed alpine settings in Idaho. A 5-mile glacier-carved lake at 6,547 feet, named for the spawning sockeye salmon that historically turned the water red in autumn (the sockeye return is now severely diminished due to downstream dams, though a small population still completes the journey each year). Redfish Lake Lodge (opened 1929) sits at the north end with rustic cabins, a restaurant and lakefront bar, a marina with boat rentals, and access to several major trailheads. The lake reflects Mount Heyburn (10,229 ft) and Grand Mogul (9,733 ft) on calm mornings. Day-use fee approximately $5. Little Redfish Lake (just north on the access road) prohibits motorboats, making it quieter.

Stanley The byway's northern terminus, a tiny historic town (population approximately 70) at 6,253 feet, sitting in a broad meadow with the Sawtooths rising abruptly to the south. The dirt-street feel of Stanley remains largely intact; restaurants, lodges, and outfitters serve summer rafters, fly anglers, and hikers, and winter snowmobilers and ice fishers. Stanley is the staging point for multi-day rafting trips on the Main Salmon and Middle Fork. The Sawtooth Scenic Byway ends here; the Salmon River Scenic Byway (ID-75 north to US-93) and the Ponderosa Pine Scenic Byway (ID-21 west to Boise) both depart from Stanley.

Driving Tips

• The byway is fully paved, two-lane, and well-maintained throughout. ID-75 over Galena Summit is plowed in winter but can be difficult during storms; carry chains November through March.
• Fuel up in Hailey, Ketchum, or Stanley. The 60-mile stretch from Ketchum to Stanley has only one fuel option (Smiley Creek Lodge), and it can run out of supply in peak season.
• Cell coverage is reliable in the Wood River Valley (Hailey, Ketchum, Sun Valley), spotty between Ketchum and Stanley, and intermittent in Stanley. Download offline maps.
• Sun Valley and Ketchum lodging is among the most expensive in Idaho. Hailey and Bellevue are significantly cheaper alternatives within 20 to 30 minutes' drive.
• Stanley sits in a frost pocket. Even in midsummer, overnight lows can drop near freezing. Pack layers regardless of season. In winter, Stanley regularly records the coldest temperatures in the contiguous United States (minus 40°F and below).
• Wildlife is abundant: mule deer, elk, pronghorn, bighorn sheep, mountain goats, black bears, moose, and (rarely seen but present) gray wolves and wolverines. Most active at dawn and dusk.
• Wildfire smoke can affect the corridor from mid-July through September. Check airnow.gov for air quality.
• Reservations are essential for Redfish Lake Lodge, Sun Valley Lodge, and Stanley accommodations during summer weekends. Book months ahead.
• The Trailing of the Sheep Festival (mid-October) brings traditional sheep-herding flocks through the Wood River Valley, sometimes blocking the byway briefly. Plan for short delays and enjoy the show.
• Galena Overlook is one of the most photographed spots in Idaho. The best light is early morning when the Sawtooths catch first sun while the basin remains in shadow.
• Galena Summit and Stanley Basin sit at high elevation. Drink extra water, especially when hiking, and watch for altitude effects.
• Afternoon thunderstorms over the Sawtooths can be intense in July and August. Plan high-elevation hikes to be off summits by noon.
• For more information visit: Idaho Tourism: Sawtooth Scenic Byway