South Fork Walla Walla Trailhead The South Fork Walla Walla trail is popular for hiking, mountain biking, horseback riding, and motorcycling. After a 3-mile hike along the beautiful South Fork Walla Walla River, you enter the Umatilla National Forest, and trails continue from there. The Trailhead provides a great place to relax and picnic alongside the river. This area is very special and was designated an Area of Critical Environmental Concern (ACEC) in 1994. In order to prevent deterioration of the areas many resource values, the 1,955 acre ACEC is closed to overnight camping. Activities: Facilities: The trailhead provides parking, vault toilets, and a picnicking area. Season: Other: Open year-round. The trail is not open for Class I (quad ATV) or Class II (4x4) use.
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