Lake Koocanusa Scenic Byway (Highway 37)
The headliner. Connects Libby and Eureka along the Kootenai River and the east shore of Lake Koocanusa. Designated a Montana Scenic Byway in 1992. Watch for the Ural-Tweed bighorn sheep herd along the road. Don't miss the Koocanusa Bridge — the longest and tallest bridge in Montana, rising about 215 feet above the water, crossing to the lake's quiet west side (side loop FDR 228, closed in winter). Stop at the Libby Dam Visitor Center on the way.