Skagit Power Development, Diablo Powerhouse, On Skagit River, 6.1 miles upstream from Newhalem, Newhalem, Whatcom County, WA
Significance: Seattle City Light, during the construction of the Skagit Power Development, maintained a dedication to quality. This becomes evident in the ornamental details of Diablo Powerhouse. Unit 31 in the powerhouse was the largest of its kind when ordered in the early 1930s.
Unprocessed Field note material exists for this structure: FN-6
Survey number: HAER WA-24-D
Building/structure dates: 1936 Initial Construction