Trip was a counter clock wise loop from North Fork Sauk to Red Pass, along the PCT and north to Sitkum Creek. The return was along 643.1 then up to the lakes and Lost Creek Ridge, then back down at Bingley Gap. I did this in 6 days, taking my time. This was late September and the weather, when not raining, was cool and cold at night. You'll want the Glacier Peak and Sloan Peak Green Trails maps (available from REI). Be sure to waterproof them.
I left the State Road 49 trailhead at 2 pm in the rain in hopes that the Mackinaw Shelter would be habitable for the night. Nope. Its in very bad rotting condition. Next day's hike up to the PCT with full pack for a 3k gain was tough but the views and camping from White Pass are inspiring. There are polite signs requesting that the nice sites directly on the ridge and PCT not be used. There are a couple good sites a hundred feet or so from the trail, otherwise you'll need to drop down to the saddle below the pass. No water at the top.
Lots of through hikers on the PCT heading north, wonderful hike along the ridge to Red Pass, then down a spectacular glacial valley bowl with views of Glacier Peak and down down down into the White Chuck wilderness to camp at Sitkum Creek.
643.1 has not been maintained for a couple years and is easy to loose at both ends with a lot of down falls. At the confluence of the White Chuck and Sitkum Creeks it took 1.5 hrs to cross Sitkum and find the trail up to Lake Bryne. Would not suggest this trail alone, as it is very remote. Probably Kennedy ridge, 643 is the better connection to the Lost Creek and Bryne/Round Lake trail. The Kennedy Hot Springs is interesting to muck around. The water is about 80 degrees and has formed soggy terraces with strange flora. To head east on 646, find the trail to the right of the springs after crossing the stream. There are widely spaced orange tape flags to the trail up.
Another 3k climb up the Bryne Lake. It was overcast but the water was a rich clear blue color I have never seen. Simply spectacular. The best camping spot is on the rise just to the right of the clearing when the lake is reached. There were no other hikers for the two days I was up there, but passed a couple coming down on Saturday. Lost Creek Ridge to Bingley Gap is very rugged and very spectacular even in the rain. I tried to do it in a day, but it took two, but I'm slow. Spent a wet night on the ridge sharing sleep with a big root.
After the interminable down hike to 49 you have 4 or 5 miles of dirt road back to the Sauk trailhead. I stowed my gear behind a trunk and started the walk. An angel at the Sloan creek trailhead gave me ride
after I'd walked about a mile.
Whew. big week!