1963 Map of Diablo Dam

About this map

Diablo Dam and the Skagit River hydroelectric infrastructure anchor this mid-century survey of the high mountain landscape. The map details the complex industrial presence of the Seattle City Light settlements at Newhalem and Diablo, including the Gorge Powerhouse, Substation, and Intake Tower. These remote company towns are surrounded by the designated wilderness of North Cascades National Park and the Ross Lake National Recreation Area, where massive ice fields like the Neve Glacier and Colonial Glacier dominate the high peaks. The topography illustrates the dramatic elevation changes between the reservoir surfaces of Gorge Lake and Diablo Lake and the soaring summits of Snowfield Peak and Pyramid Peak. Established routes for fire watch and recreation are visible, including the Sourdough Lookout Trail, while the Whatcom Co Skagit Co line cuts through the southern glaciers.