Colonial Peak, Mountain summit in North Cascades, Washington, US
Colonial Peak rises 2,369 meters above sea level, featuring steep cliffs and a prominent west ridge that extends from Thunder Arm of Diablo Lake.
William Degenhardt and Herbert Strandberg, members of the Seattle Mountaineers, completed the first documented climb of Colonial Peak on July 31, 1931.
The mountain received its name from the Colonial mining claim established on its slopes, reflecting the regional mining heritage of the North Cascades.
Climbers access the summit via the Pyramid Lake Trail near Diablo Dam, following the West Ridge route through Colonial Glacier during May through September.
The peak stands at the northern end of a mountain chain that includes Eldorado Peak, rising 2,000 meters over just 3.7 kilometers from Thunder Arm.
Location: Washington
GPS coordinates: 48.66152,-121.12123
Latest update: March 17, 2025 19:57
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Gorge Hydroelectric Power Plants
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Gorge Powerhouse
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North Cascades National Park Visitor Center
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Diablo Lake Overlook
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