U.S. Route 12 between Lewiston, Idaho, and Lolo Pass in Montana follows a historic path once traveled by the Lewis and Clark Expedition. Today, the highway is known for its long stretches of smooth pavement, scenic river valleys, and steady curves, making it a favorite ride among motorcyclists.
Because the road follows the Clearwater and Lochsa Rivers, riders enjoy more than 100 miles of continuous curves through forested mountain landscapes.
This route is featured in our guide to the Best Motorcycle Roads in America.
🔍 Quick Facts
Distance
~700 miles
Elevation
700 – 5,233 ft
Surface
100% Paved
Best Time
Jul – Sep
Skill Level
Int – Adv
Route Overview
The most scenic section of U.S. 12 runs through the Clearwater National Forest and the Lochsa River corridor.
This portion of the highway offers:
- long stretches of winding road
- minimal development
- beautiful forest scenery
Many riders describe this route as one of the most relaxing and enjoyable mountain rides in the northern Rockies.
What Makes This Ride Special
Continuous Curves
The road offers a steady flow of sweeping turns for more than 100 miles.
River Views
Much of the route follows the Lochsa River through scenic valleys.
Light Traffic
Compared with other popular mountain routes, traffic is typically moderate to light.
Historic Significance
The road follows part of the historic Lewis and Clark expedition route.
Route Highlights
Lochsa River Canyon
One of the most scenic sections of the ride with winding curves and forest views.
Lolo Pass
The mountain pass marking the Idaho–Montana border.
Lewis and Clark Historic Markers
Several historical sites along the route highlight the expedition’s journey.
Tips for Motorcycle Riders
- Watch for wildlife in forested areas.
- Check weather forecasts before crossing mountain passes.
- Take advantage of scenic pullouts along the river corridor.
Best Time to Ride
Late spring through early fall usually provides the best riding conditions. Snow may affect mountain passes earlier in the season.
Final Thoughts
For riders who enjoy long stretches of flowing curves through mountain forests, the Lewis & Clark Highway offers one of the most enjoyable motorcycle routes in the Pacific Northwest.