The Aiguille de I’M is an odd feature in Boston Basin in the North Cascades National Park. Often referred to as “The M,” this feature actually looks like an “M.” Found just south of the Torment Forbidden Traverse, the small peak splits Boston Basin from Torment Basin, with the Taboo Glacier on the west side and the Unnamed Glacier on the east…
Aiguille de I’M
(Click to Enlarge)
The Aiguille de I’M has two named routes on it. The first is the South Ridge, a cool 5.6 romp up an exposed ridge. And the second is the North Ridge, a 5.5 exposed ridge line.
(Click to Enlarge)
Approach: Approach as for Forbidden Peak in Boston Basin (see Selected Climbs in the Cascades, Volume I) and camp at either the lower or the upper bivy sites. From the bivy, make your way up toward the Forbidden Gully or the Cat Scratch Gullies (the two options commonly used to access Forbidden Peak.) Traverse toward the notch to the right of the North Ridge of Aiguille de I’M.
Classic Sharp Ridge Climbing on “The M.”
Route: From the notch make three or four fourth class pitches to the base of a tower. Make a final forty-foot 5.5. pitch to the top of the tower. It is possible to climb further, but not recommended as the true summit looks like it’s about to topple over.
Looking back on the ridge from the summit tower.
Descent: Make one forty-foot rappel and then reverse the ridge climb.
The North Ridge is a very cool ridge line. It can easily be done as a half-day climb from Boston Basin. And it is far less committing than almost anything else in the Basin since it is so short.
There are dozens of these little gems in the Cascades that are often missed. The M is well worth your time…
–Jason D. Martin