A mountainous region in northern Washington, roughly bounded on the north by the international border; on the south by Skagit River, Cascade River, Cascade Pass, and upper Stehekin River; and on the east by Ross Lake, Thunder Creek, Fisher Creek, and North Fork Bridge Creek. This region encompasses the Mt. Baker Wilderness, Noisy-Diobsud Wilderness, and most of North Cascades National Park.
Sharkfin Tower via Boston Basin—Quien Sabe Glacier—Southwest Gully—Southeast Ridge (Thunder Mountains, WA)
Trip Date: June 16-18, 2026 Sharkfin Tower Climbing Trip Lower Boston BasinQuien Sabe GlacierSharkfin Tower (8120+ ft) Trip...