Bit of update on nearby area. Past drainage Vern & co took for Astley, trail still continues along Stewart canyon. Right of the bat there is park sign informing that trail ahead is 'poorly defined'. It is still easily followed for awhile, but then in enters area of huge blowdown. It is impossible to stay on the trail and some miserable bushwhack is required to the right to bypass this section. Things then ease up; I followed for about 45 mins past Astley drainage hoping for some open views into upper valley, but none was coming. Trail still continues and despite occasional deadfall it is still fairly good. I'd be curious if someone knows how far and where does this trail go? Are there any ranger cabins further up?
Here's pic of Cascade river bend, perhaps 30 min past Astley drainage: