September 15, 1925: "A new steel lookout tower has been built on the San Jose hills from which to watch for fires in the Pomona valley." (The Santa Maria Daily Times)
1925: The Los Angeles County Forestry Department constructed a lookout tower at this site, south of San Dimas, for a cost of $700.
June 30, 1946: "At the close of the fiscal year, a new telephone line between San Jose Division Headquarters in San Dimas and South Hills Patrol Station at Walnut was under construction. This line will also connect the San Jose Fire Lookout Tower situated near Puddingstone Dam and will complete the Departmental Telephone System connecting all Mountain Battalion Stations." (Los Angeles County Forestry Department Annual Report - Fiscal Year ending 6/30/1946)