Lemhi Pass

Lemhi Pass was designated a National Historic Landmark in 1960 for its significance to the Lewis and Clark expedition. It was a point of hopeful anticipation, as the Corps of Discovery looked forward to meeting the Shoshone and trading for horses to continue their journey, and a point of disappointment as it became obvious that a navigable waterway to the West Coast would not be found among these rugged mountains.

Today, the landscape at Lemhi Pass is very much like it was 200 years ago. You will find native sagebrush and bunch grasses, edged with patches of douglas-fir and lodge pole pine trees. The westward view from Lemhi Pass is of distant ranges of steep, rocky mountains. The weather is generally cool and unpredictable. It can snow at any time of the year. Thunderstorms with lightning, strong winds, and rain or hail are likely in the summer months.

The Forest Service has signs at Lemhi Pass during the summer months, to help tell the story of the pass. Management of Lemhi Pass is intended to maintain the natural, historic landscape. That is why you will not find much development at this site. Lemhi Pass remains a remote mountain pass in a natural landscape, offering motor-vehicle travelers views similar to what Lewis and Clark witnessed on foot and horseback in 1805.

Directions: From Dillon, Montana, take Interstate Highway 15 south to Clark Canyon Dam, about 19 miles. Turn west, onto MT Highway 324, a paved, two-lane road that crosses the dam and skirts the reservoir along its northwest shore. Clark Canyon Reservoir, completed in 1963, is managed by the U.S. Bureau of Reclamation. The site of Lewis and Clark's 'Camp Fortunate' is now under water, but an overlook, picnic site, and campgrounds have been developed above the shoreline, along the highway

.As you leave the reservoir, you will be driving west on Highway 324, up the Horse Prairie Creek Valley, which Lewis called Shoshone Cove (using the old term 'cove' for 'valley'). Along the way, you'll pass a little town called Grant, about 12 miles from Clark Canyon Dam. In this area, Lewis sighted the first Shoshone on horseback.

Drive about 21 miles west from Clark Canyon Dam, to the junction of Trail Creek Road, a gravel road joining Highway 324 from the west.

The road to Lemhi Pass, called Trail Creek Road, is a rough, gravel and dirt road. From Highway 324 to Lemhi Pass on the Continental Divide, the distance is about 12 miles. Except for the last 1.4 miles, the Trail Creek Road crosses private ranch land. Please respect private property along the road.

The last four miles of road in Montana below Lemhi Pass is usually closed due to snow from late November through early June. This segment of road is also extremely muddy and impassible when wet from snow melt or summer rain. The Forest Service plans to surface this road with gravel, to reduce the rutting and mud, but it will remain a narrow, single-lane mountain road

.We strongly advise a high-clearance vehicle on the Lemhi Pass road, for some sections may be deeply rutted and others very rocky. You'll want to be sure you have a good spare tire, and equipment to change a tire if needed. The last four miles of road below the pass are quite narrow - a single driving lane. Watch for oncoming traffic and be prepared to use a turnout, or back up if you meet a vehicle. Keep in mind that generally, downhill traffic has the right-of-way.

Lemhi Pass
Beaverhead-Deerlodge National Forest, Dillon, MT 59725

Activities Lewis and Clark Historic Services Trail

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