Poison Rock (LO site), Mendocino County, California, Elevation = 5559 ft

Located in the Mendocino National Forest

This foundation is all that remains of the Poison Rock Lookout. It was built in 1935. The survey datasheet says it was abandoned by 1964 and about to be removed.
The benchmark disk is on a rock about 150 feet west of the foundation. It was placed in 1942. Datasheet