Big Southern Butte (LO site), Butte County, Idaho, Elevation = 7560 ft.

Located on BLM land

This photo is looking east toward the summit area of Big Southern Butte. The peak can be driven up with a suitable vehicle with high-clearance. There was a two-story concrete block building with wood frame cab constructed on top in 1963. This was removed sometime before 2013.
The summit area is flat and graded so there is no sign of the former lookout. Photos taken August 24, 2017.
We could not locate a primary benchmark, but did find this Reference Mark #1 west of the summit. Datasheet for the missing primary: OY0946