This 32-mile segment of the Lewis & Clark National Historic Trail traces the expedition's difficult 1805 crossing of the Bitterroot Mountains near the Montana-Idaho border. Unlike the full 3,700-mile national historic trail, which largely overlays modern roads and rivers, this section is a continuous wilderness backpacking route through dense forests and mountain passes. It follows the Lolo Trail along ridgelines and through old-growth cedar groves, over terrain much as the Corps of Discovery found it. Best suited for intermediate to advanced backpackers comfortable with remote wilderness travel, tricky navigation, and variable mountain weather.
This trail corridor typically falls under Clearwater National Forest (Idaho) and Lolo National Forest (Montana) management. As of recent guidance, no permits are required for overnight camping in these wilderness areas, but check with the respective forest service offices before your trip; regulations can change, especially during high fire danger periods. Standard wilderness regulations apply: camp at least 200 feet from water sources, pack out all waste, and practice Leave No Trace principles. Bear canisters are not mandatory but strongly recommended given how remote the corridor is. Group size limits are typically 12 people maximum in wilderness areas. Open fires may be restricted during summer months; check current fire restrictions with the Clearwater National Forest or Lolo National Forest before departure.
Late July through September is the most reliable window for this high-elevation route. Snow typically clears from the passes by mid to late July, though early season snowpack can linger into August in heavy snow years. The trail crosses several ridgelines above 6,000 feet where snow accumulation can be significant. August and early September bring the most stable weather, with warm days and cool nights, though afternoon thunderstorms are common; plan to reach passes and exposed areas by early afternoon. September brings fall color, especially in the larch groves, along with the possibility of early season snow and much shorter daylight hours. Spring and early summer (May-June) are generally impassable due to deep snowpack and high water at creek crossings. Winter conditions are extreme and suited only for experienced winter mountaineers.
No specific water sources are listed for this trail, but the Lolo Trail region generally has reliable seasonal creeks and springs, particularly in early to mid-summer. Water can get scarce during late summer and early fall, especially along the ridgeline sections. Carry capacity for at least 2-3 liters between sources and be prepared to drop elevation to reach water in some sections. Snowmelt and seasonal springs are most dependable through August. By September, many smaller sources may dry up, so plan water stops more carefully. There are no resupply points along this 32-mile segment; it is a continuous wilderness crossing that requires full self-sufficiency for the duration of your trip. The nearest resupply towns are Lolo, Montana (west end) and potentially Powell or Kooskia, Idaho, depending on which trailhead you're accessing. Plan for 3-4 days of food for most backpackers.
Navigation can be challenging. Portions of the historic Lolo Trail are not as well maintained or clearly marked as modern recreational trails, and the route crosses numerous forest roads and logging areas that can create confusion, so bring detailed topographic maps and GPS navigation. Dense forest sections may lack clear tread and require careful route finding. Weather is highly variable at elevation: afternoon thunderstorms with lightning are common from July through September, which makes exposed ridgeline travel dangerous during peak heating hours (1-5 PM). Start early to reach passes before storms build. Black bear activity is common throughout the corridor, so proper food storage is essential. Grizzly bears are less common than in areas further north but are present in the region. Mountain lions inhabit the area, though encounters are rare. The remoteness is itself a hazard: cell service is nonexistent, you may be multiple days from road access, and an emergency evacuation would be extremely difficult. Mosquitoes and biting insects can be intense through mid-August, particularly in forested areas near water. Recent forest fires have affected sections of the Clearwater and Lolo forests; check with rangers for current trail conditions, since burned areas create deadfall hazards and can change the landmarks used for navigation.
Access points for this segment generally involve Forest Service roads branching off US Highway 12, which parallels the historic route through the Lolo Pass region between Lolo, Montana and Kooskia, Idaho. Highway 12 crosses Lolo Pass at approximately 5,233 feet elevation. Specific trailhead access depends on which segment you're hiking. The Lolo Motorway (Forest Road 500), a historic high-elevation route, reaches various points along the trail corridor, but the road is extremely rough and narrow and typically requires a high-clearance vehicle. Four-wheel drive is recommended, and the road may be impassable in wet conditions or early season. Missoula, Montana (approximately 40 miles northeast of Lolo) has the nearest major airport plus rental cars and supplies. Lewiston, Idaho (approximately 100 miles west) is another airport option. For shuttle services, contact local outfitters in Missoula or Lolo, though options are limited in this remote area. Most backpackers arrange a vehicle shuttle or hitch back on Highway 12. Parking at the remote trailheads is typically free but very limited and not secure, so do not leave valuables in vehicles.
The 9 existing campsites along this 32-mile segment average roughly one every 3-4 miles, which is relatively frequent and points to established camping zones. Given the terrain and elevation changes, though, don't expect evenly spaced camps; some sections may require longer pushes between suitable sites. Scout camps early in the afternoon rather than pushing until dusk, since flat, dry ground can be scarce in dense forest or steep terrain. Ridgeline camps have big views and fewer insects but sit exposed to wind and lightning. Lower elevation camps near water are more protected but come with heavier insect pressure. The history is a large part of why people hike this route; a copy of the Lewis and Clark journals makes good evening reading. The expedition struggled terribly through this section in September 1805, facing snow, starvation, and difficult terrain, and their route runs remarkably close to the modern trail corridors. For photographers, the combination of old-growth forest, mountain views, and fall larch color (if you time September right) is exceptional. Given the navigation challenges, consider hiking with someone who has previous experience in this area, or at minimum download offline maps to your GPS device before entering the wilderness. Cell coverage ends shortly after leaving Highway 12 and won't return until you exit the wilderness corridor.
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