O'Leary Mountain Trail is a 18.2 mile out and back trail located near Blue River, OR and is rated as difficult. The trail is primarily used for hiking and mountain biking and is accessible year-round.
Directions from Blue River: Travel 3.5 miles east on Hwy. 126 to Aufderheide Drive (FS road 19). Continue on Aufderheide Drive to FS Rd. 1900-410 and travel for 2 miles to the powerhouse at Cougar dam. Just before entering the Corps of Engineers enclosure turn east on 1900-411 and proceed 2.5 miles. The trailheads common to the Castle Rock and Echo Trailhead.
Mostly downhill in the first 2 miles. The spikes uphill and downhill again. No views from the top to look at, just a lot of trees. great for bicyclist. Coming back was mainly steep uphill. Lots of wild rhodies, colorful conks, big trees.