Warm Springs Mountain
Angeles National Forest Locate the trailhead (if you dare! Edited to correct spot based on the topo, original point went here based on what I remembered of the road and river.) According to Afoot and Afield in Los Angeles County , there is a trail up Warm Springs Mountain. It doesn't actually get to the top, but it gets close enough to scramble the rest of the way. According to the forest map, there is a trail up Warm Springs Mountain. It even has "OHV" written on it at the top, though that may be due to whatever road at the saddle Afoot and Afield mentioned should be ignored. The directions seem less complete than usual in the book, but they did seem to hit all the points in getting me there. It says the trail is unsigned at marker 11.23. Unfortunately, the roads in the area have been remeasured. I already found this on the other trail I tried, so wasn't too worried that 11.23 a fully unmarked wall and there wasn't any ravine for the trail to go...