Northern North Cascades Loop (Backpacking) Professional Review and Guide
"Nowhere is the rugged beauty of the North Cascades on better display than it is here. Everything seems to be on a larger-than-life scale. There are big trees, huge glaciers, incredibly deep canyons, impossibly steep ridges, and vast views. For variety the trip visits a fire lookout and uses a unique hand-powered cable car to make a stream crossing.
You must begin by obtaining the required backcountry permit. This is somewhat more complicated than that simple statement would imply. The Park Service severely restricts the number of available campsites. Permits are issued only in person, on the first day of the trip or up to one day before, and on a first-come-first-served basis. No reservations are taken. Backcountry permits are available from the ranger station in Marblemount, or, more conveniently for this trip, from the Glacier Public Service Center in Glacier."