Lolo National Forest · Montana, Idaho

Flat Rock Ridge

5.5 mi of trail, end to end · about 900 ft of climbing · 2,400 ft of descent · 4,545 ft–6,391 ft · native material surface · trail No. 254 · trail class 3 · typical grade 12-20% · tread 18-24 inches wide · hiking, horse, bike

4,545 ft 4,937 ft · 2.7 mi high 5,099 ft

Begins at the forest's mile 0, 47.4439, -115.1584 - no trailhead mapped Drive to where the trail begins

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About this trail's facts

The lines are the US Forest Service's National Forest System trails layer (public domain), read 2026-10-16 and simplified for the map; the length is the line's, end to end, and the class, surface, grade and tread width are the forest's own entries where it publishes them - a forest that publishes the centreline alone has none. The trailheads and the points along the way are the Service's recreation points, and the write-ups its own recarea text, unedited. Heights come from USGS 3DEP through Terrain Tiles on AWS (Mapzen/Tilezen), read along each line and rounded; a short trail on steep ground can be off by a few tens of feet. Closures change: check the forest's own site before you go.