1964: Concrete building with an observation room on top. (Kresek)
August 10, 1971: :A weekend cloudburst of over an inch of rain in less than 30 minutes caused heavy damage to an Owyhee County road. The rain damaged a six-mile stretch of road near South Mountain, Saturday night. According to reports, portions of the road were almost completely obliterated. The road was used for access to the BLM fire lookout on South Mountain. Owyhee County Sheriff Tim Nettleton, county commissioner Frank Jayo and Ray Gulch, road maintenance supervisor, toured the area Sunday. It is estimated that it will take a week to reopen the road." (The Idaho Free Press)
The NGS Data Sheet
DESCRIBED BY US GEOLOGICAL SURVEY 1973 LOCATED ABOUT 21 MI SE. OF JORDAN VALLEY. ON HIGHEST POINT OF SOUTH MOUNTAIN.
TO REACH FROM JORDAN VALLEY, DRIVE SE. 7.5 MI ALONG RD. TO JUNIPER MTN. AND THREE FORKS TO Y-RD. FORK JUST N. OF PLEASANT VALLEY SCHOOL. KEEP TO LEFT FORK AND FOLLOW MAIN-TRAVELED RD. 8.9 MI TO Y-RD. FORK. KEEP TO RIGHT FORK AS PER SIGNS SOUTH MOUNTAIN 4.8 MI TO OLD MINING CAMP AT BASE OF MOUNTAIN. CONTINUE STRAIGHT AHEAD UPHILL 2.5 MI TO HIGHEST POINT OF SOUTH MOUNTAIN AND STATION. NOTE--A BLM LO IS AT STATION SITE.