A mountainous sub-region within the Northwestern Washington Cascades, bounded by Marble Creek, Dorado Col, West Fork Thunder Creek, Fisher Creek, Fisher Pass, North Fork Bridge Creek, upper Stehekin River, Cascade Pass, and North Fork Cascade River. Notable landforms include Hidden Lake Peak, Eldorado Peak, Forbidden Peak, Boston Peak, Sahale Peak, Mt. Buckner, Mt. Logan, and Mt. Goode.
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...