We plan on taking the shortest walking route over the mountains to the Birch Creek drainage and then floating the creek in Alpacka rafts. Here is a sample picture I stole from the companies website. These pack rafts are perfect for backcountry travel because they weight a meager 4lbs!! and can fit into your backpack.
How lucky is this--I actually got to fly over a portion of the route last week while returning from a work field trip. The mouth of Harrison Cr appears to be the best point to end the 40+ miles of floating on Birch Cr and resume the last 15 miles of bushwhacking to Circle Hot Springs. There is still some ice on the banks of Harrison Cr which = effortless walking.