East out of Portland. Go under the St. Johns bridge and turn left at the light. Go up the hill and make a switchback turn to the right onto Germantown Rd. Go up the hill for a few miles and park in the trail head.
Trails are back across the road.
As stated by reviewer above, but there are many routes available as you learn the trail system. Powell Butte in SE Portland is alright. Some technical terrain on the north side of the ride, but not much of a workout for me. I really get my heart rate up as the climbs are pretty challenging and the descent somewhat technical. The trail is very rocky in many places so lube that fork or, better yet, get a full-suspension bike to ride here.