Big Therriault Lake

Trail Overview

Big Therriault Lake is a well-used gravel FSR 319 in the Kootenai National Forest. The route accesses Big Therriault Lake, Little Therriault Lake, and trailheads to Rainbow, Wolverine Lakes, Otter Creek, and Weasel Lake. This route climbs deep into the Ten Lakes Wilderness Study Area and gives access to some of the most remote areas of Montana. The road is a mild grade and well-maintained. There are multiple campgrounds along this route with vault toilets and hand-pump water wells. The campgrounds generally have hosts and are in good condition. Some areas have experienced recent wildfires, and deadfall across the road is common. There are deer, elk, bear, mountain lion, and wolverine in the area.

Photos of Big Therriault Lake

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Difficulty

The road is generally well maintained, though deadfall from a recent fire persists. It is recommended that you bring a saw.

Technical Rating

Big Therriault Lake can be accessed by the following ride types:

• High-Clearance 4x4
• SUV
• SxS (60")
• ATV (50")
• Dirt Bike