This is the 50K version of the route posted by Christof Teuscher as part of the Wy'Cool Challenge Series (also including 50mi, 100K and 100mi options).
http://www.christofteuscher.com/aagaa/wycool-challenge-series/
Begin at Zigzag Ranger station, ascend Hunchback Ridge trail (#793) to the intersection with Green Canyon Way (#793A) then complete the loop in either direction. The Clockwise loop option continues to Devils Peak, then descends to continue on Kinzel Lake trail (#665), turning right continuing on Salmon River trail (#742) to the trailhead. The trail crosses the road (2618) and continues as Old Salmon River Trail for a short distance to the start of Green Canyon Way (#793A). This ascends Green Canyon to rejoin Hunchback Ridge trail (completing the loop), turning left to retrace the route back to the trailhead at the Zigzag Ranger station.
Start time was 1am since we were looking for some night running practice for next month's IMTUF 100 mile race. We followed the course clockwise with short out-and-back side trips to obtain water on the spur trail to Kinzel Lake and the Salmon River near Green Canyon campground. This was a training run, mostly in the dark.
More photos on Strava.