West of Portland and east of Tillamook, the Tillamook State Forest has 200 miles of trails open to off-road motorcycle trails riding. A great place to start is the Jordan Creek OHV Area. This trailhead is located at milepost 18 of the Wilson River Highway (SR6).
From the Jordan Creek Trailhead, there are 100 miles of trails that crisscross the costal mountains. The routes combine logging roads and narrow trails.
Overall, Jordan Creek OHV Area is the 3rd most popular dirt bike trail of all 48 dirt biking rides in Oregon.