Northeast of Pendleton in the Umatilla National Forest, the Upper Walla Walla area has 40 miles of trails open to dirt biking. The trailhead is located 12 miles east of Milton-Freewater on Walla Walla River Road to Harris Park.
To reach the trailhead from Milton-Freewater, follow Walla Walla River Road for about 5 miles. At Forks Junction, turn right and continue another 7 miles to Harris Park. A BLM trailhead is about 1 mile past the park.
Overall, Upper Walla Walla is the 32nd most popular dirt bike trail of all 48 dirt biking rides in Oregon.