July 20, 1932: “George Storms assumed his duties Tuesday at the Sweetgrass Ridge lookout.” (The Wenatchee World)
August 15, 1932: "Houses for the lookouts on Sweet Grass ridge near eight-mile, are also to be built. Work will probably be started on these projects in the near future.” (The Wenatchee Daily World)
Activated: March 16, 1942; Deactivated; July 1, 1943. Seattle Filter Center.
June 7, 1973: "This site was once a permanent fire lookout station, but use was discontinued in the mid-1960's. It still serves as an emergency lookout during lightning storms and high fire danger weather." (The Herald-Reporter)