Trinity Mountain, Elmore County, Idaho, Elevation = 9451 ft.

Located in the Boise National Forest

The first lookout on Trinity Mountain was a 12 by 12 ft. stone cabin in 1922 which was replaced in 1956 with a concrete base and L-4 cab. The lookout was staffed when we visited. Photo on August 27, 2018. This lookout is on the National Historic Lookout Register #1445.
The outhouse sets right on the edge of the mountain.
Trinity benchmark was placed in 1959. Datasheet: OZ0992