Sourdough Mountain Lookout–Trail is 5.5 miles long and one mile straight up!

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Quick Facts: Location: North Cascades Highway Land Agency: North Cascades National Park Roundtrip: 11.0 miles Elevation Gain: 5,100 feet Green Trails Maps: Diablo, WA-No. 48 Access: From Marblemount, follow the North Cascades Highway (SR 20) east for 20 miles. Turn left onto Diablo Road and proceed 0.7 mile crossing an iron bridge spanning Stetattle Creek. Bear right reaching the trailhead in […]