Developed in 1917 with a cupola cabin, the present L-4 ground cab was built in 1933 and is listed on the National Historic Lookout Register. It is staffed every summer.
North Cascades National Park
2 miles northeast of Ross Dam
Whatcom County, Washington
Elevation 5985'

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Sourdough Mtn. in 1921 Sourdough Mtn. L.O.
Photos courtesy the Fire Lookout Museum and Jennifer M. Weldon