That Rock Climbing

Turn on Fish Creek Road (off of highway 12), 0.25 miles south of Lolo Hot Springs Resort. Follow the road for 2 miles, turning left at a three way fork onto Granite Creek Road. Drive another 4 miles to a locked gate (exactly at the 6 mi marker). Follow the road for a few minutes until it makes a right bend. Continue on and at the next right bend in the road, turn left into the woods. If you follow the stream (or stream bed later in the year) for 10 minutes or so, you'll make it to That Rock. To get to Random Events Wall, walk through the obvious split in the rock.

The Western Montana Guide book description to get here is inaccurate and will lead you astray, albeit probably to some cool features, but not That Rock. The above description will get you there.