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Bus is every ~15 minutes during rush hours, but much less frequent on my way back. I saw a bus left and had to wait for 40 minutes for the next one. There's a closer access from the back of the 400m running track of West Linn High School if you are taking the bus. Get off the bus at Webb St (on Willamette Dr), and walk west up the hill to the high school. There's an entrance before the main building. The trailhead is marked on Google Map, and through an opening of the fence.