July 18, 1928: "Work on another telephone line from Horse lake to Horse mountain will be started soon for a secondary lookout point." (Morning Register)
July 16, 1931: "Burros will be assigned the task of carrying two lookout houses to the top of Cascade national forest promontories. Ready-cut materials for the lookout stations have been trucked to Elk lake, and Dee Wright and Ed Woods, veteran packers, will load the houses on muleback and carry them to the summits of Olallie butte and Horse mountain." (Morning Oregonian)
September 3, 1931: "A new lookout cabin has just been completed by the Cascade national forest on top of Olallie mountain and a new patrolman's cabin at Rigdon ranger station. Material is on the ground for a new lookout house on top of Horse mountain." (Morning Oregonian)
1932: A 14x14 L-4 gable roof lookout house was constructed.
September 2, 1933: Panorama photos taken by Lester Moe.
July 4, 1948: "At the opposite end of the age line are veteran woodsmen like Ralph W. Teeters of McKenzie Bridge. He is a retired railroad man, and will man Horse Mountain lookout with his wife." (Register-Guard)