About 1923, a log cupola cabin became the first structure on Middle Sister. A 35' wooden tower with L-4 cab replaced it in 1951, but was accidentally burned in 1953. The present 30' treated timber tower with L-4 cab, built in 1954, is staffed most summers. It is listed on the National Historic Lookout Register. There was also a patrol lookout tower 1 1/2 miles northwest atop West Sister until 1954.
St. Joe National Forest
10 miles southeast of Avery
Shoshone County, Idaho
Elevation 6898'

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Middle Sister in 1950 Middle Sister in 1995
Photos courtesy of Gary Weber