Set on top of the southernmost pinnacles of the peak's eponymous three summits, is a one-room wood frame cabin measuring 14 by 14 feet (4.3 m × 4.3 m).

A chain with turnbuckle is mounted at the ceiling level, joining the east and west walls as a means to strengthen the building against lateral wind forces.

Engles and Harry Bedal had first scaled the peak in 1929, to investigate its feasibility as a fire observation site, given its visual prominence.

Construction materials were brought by pack animals to within 600 feet (180 m) of the summit, and transported via a tram system to the work site, which was accessed by a series of ropes and ladders.

[3] Major repairs were completed in 2021 by the volunteer group Friends of Three Fingers Lookout, including replacement of broken windows and shutters.