Approach along the boundary Trail from the East from Iron Gate (22 miles to Cathedral Pass), from the SE up the Chewuch River Trail (20 miles to Cathedral Pass), or from the SW up the Andrews Creek Trail (18 miles to Upper Cathedral Lake).
Please keep in mind that despite guidebooks and maps posted to MP alluding to convenient access from BC, it is illegal to cross into the US from Canada in this area. The US Border Patrol does use various tools to patrol this area the fines are shockingly hefty.
Portland, OR
Spokane, WA