From the small Bates Ferry trailhead lot, follow the old roadbed for about 0.4 mile. Take the spur on the right and cross the steel-deck flatbed trailer bridge over Bates Old River. Continue across the slough; when the path bends left, look to your right for the tree. The spur is easy to miss, and you'll retrace your route to get back.
This low, unimproved trail can be wet or overgrown, and flooding can hide washed-out ground. If water covers the path beyond the bridge, turn back rather than stepping into unseen washouts. Check park conditions before setting out.