There is a relic of a trail left off of The Shimmiehorn, that may be worth hiking. A fragment of the trail is provided here for documentation only, as the trail was in difficult shape and I did not try hiking the whole trail because I was looking for a mountain bike trail. It is supposed to go down to South Fork Campground on the Umatilla. The trail should be hikeable along the ridge but I'm not sure what becomes of it when it gets into the trees and drops down to the campground. Sometime I'll check the bottom of it. With some trailwork, this could be an interesting trail.
The top is accessible by vehicle on a fairly decent gravel road that stays on top of the ridge down The Shimmiehorn. As you get near the end of the road, you hike north on the ridge starting down a jeep road and then look for the trail just off the west of the ridge. An ATV trail stays on the very top of the ridge for a bit with the other trail paralleling it. There are no distinctive markings for the start of the trail. Take FS 3128 then a right onto 3130 to get to the trailhead.