National Forest Development Road 4608 is a hiking, biking, and horse trail in Columbia County, Washington. It is within Umatilla National Forest. It is 6.0 miles long and begins at 5,486 feet altitude. Traveling the entire trail is 12.1 miles with a total elevation gain of 2,062 feet. Near the trailhead there is parking. The Moolack Spring can be seen along the trail.
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