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Bighorn Crags Trail

Salmon-Challis National Forest, Idaho · 4 min read

Distance
12 mi
Elevation Gain
2,800 ft
Difficulty
strenuous
Route Type
Out-And-Back
Best Season
July through September
Dog Friendly
Yes
Difficulty Score
10 / 10

Trailhead Amenities

Restroom
None
Parking
Free
Cell Service
No Signal
Water
Nearby
Camping
Dispersed
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Conditions, regulations, and fees change frequently. Verify with the local ranger district before your trip. Full disclaimer

At a Glance

  • Granite spires and towers visible from miles away in the Frank Church Wilderness
  • Multiple alpine lakes in the Crags basin including Ship Island Lake and Shoal Lake
  • One of the most dramatic granite landscapes in Idaho
  • True wilderness solitude: most trails register fewer than a dozen parties per week
  • Wildlife including mountain goats on the upper crags and resident lake trout populations

Overview

The Bighorn Crags are a collection of granite spires, towers, and domes rising from the heart of the Frank Church-River of No Return Wilderness in the Salmon-Challis National Forest. The 12-mile round trip to the Crags basin from the Cape Horn Trailhead delivers one of the most remote and visually striking trail experiences in Idaho: a landscape that looks more like the Needles district of Canyonlands than a forested mountain range.

Access to the Bighorn Crags is not easy. The Cape Horn Trailhead requires a long drive on rough forest roads from the Salmon River corridor. The trail gains 2,800 feet to the lake basin. No permit is required, but the combination of access difficulty and distance ensures that most visits register as genuine wilderness immersion.

The Route

Trailhead to Lower Drainage (0 to 2.5 miles)

The trail begins in open subalpine forest and descends briefly before climbing into the main approach drainage. The lower forest section is sparsely timbered given the elevation and the rocky substrate. The trail is well-maintained for a wilderness route, with clear tread and periodic cairns on the rockier sections.

Mid-Trail Climb (2.5 to 4.5 miles)

The trail climbs more steeply through the mid-section toward the Crags basin entrance. Views of the granite formations above begin to appear from this section, and the scale of the terrain becomes clear. Water is available from seasonal streams in this section.

Crags Basin (4.5 to 6.0 miles)

The trail enters the Crags basin and the granite landscape reveals itself fully. The spires rise 500 to 800 feet above the basin floor, and multiple lakes including Ship Island Lake are accessible within the basin. The day-hike turnaround at Ship Island Lake (approximately mile 6) provides outstanding views of the surrounding formations. Backpackers explore the extended basin trail network from camps here.

When to Hike

July through August provides the most reliable access. The forest road to the trailhead is typically passable from early July and the trail clears snow by mid-July in most years. August sees the most stable conditions.

September offers solitude and excellent light for photography of the granite towers. Snow is possible in September at basin elevation but rarely closes the trail in the first half of the month.

Access before July requires checking road conditions directly with the Salmon Ranger District, as the forest road is gated or impassable with snow and mud in spring.

What to Bring

Many hikers carry 3 to 4 liters of water for this long outing, supplemented by filtered creek sources in the mid-trail section. A water filter is essential. Pack out all waste: the wilderness basin has no facilities and human waste is a significant management concern at the lake camps.

This is genuine backcountry. Carry navigation tools including a paper map and compass. The granite terrain in the upper basin is rough and cairns can be unclear in poor visibility. A satellite communicator is strongly recommended given the remote location and the absence of cell service throughout.

Trailhead Access

The Cape Horn Trailhead is reached via a long drive on Forest Road 112 from the Salmon River Highway (Highway 93). The road is rough, and a high-clearance vehicle is strongly recommended. No permit or fee is required for the trail (as of 2026). River float permits are separate if combining with a Salmon River float. No restroom is present at the trailhead.

Dogs are permitted. The alpine lake basin terrain is manageable for fit dogs with sure footing.

Nearby

The Bighorn Crags are a primary destination in the Frank Church Wilderness, with no comparable trail accessible from the same trailhead. The broader Salmon-Challis system offers Mount Borah Trail for a contrasting high-peak experience and Williams Lake Trail for a more accessible lake hike near Salmon.

Check road conditions and wilderness regulations through the USFS guide before attempting this remote destination. Practice strict Leave No Trace principles in the lake basin, where camping impact is visible and recovery is slow at altitude.

Trailhead Parking

Gravel lot at the Cape Horn Trailhead on Forest Road 112. High-clearance vehicle recommended; the road is rough and typically passable from July. Space for 15 to 20 vehicles.

← Back to Salmon-Challis National Forest

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Frequently Asked Questions

How long does the Bighorn Crags Trail take?
The 12-mile out-and-back with 2,800 feet of gain typically takes 6 to 8 hours as a day hike. Most visitors spend 2 to 3 days backpacking to explore the full Crags basin, which contains multiple lakes and considerable additional terrain.
Is the Bighorn Crags Trail dog friendly?
Dogs are permitted on Bighorn Crags Trail. The granite terrain in the upper basin is rough but manageable for fit dogs. Carry sufficient water for your dog as the upper crags section requires climbing before reaching lake water.
How do I access the Cape Horn Trailhead?
The Cape Horn Trailhead is reached via Forest Road 112 from the Salmon River corridor. The road is rough and typically requires a high-clearance vehicle. It is usually accessible from early July through October. Check with the Salmon Ranger District for current road conditions (as of 2026).