Start at Greenwaters Park at 9:30.
Here is the breakdown:
You will start at Greenwaters Park with The Dam Half marathon runners. You will first cross over the awesome Willamette River foot bridge. You will then be lead to the start of the trail head. From the start of the trail head you are at an elevation of 1168. You will then finish at the top of Larison Rock which is an elevation of 3619. The total hike to the top is 4.5 miles and an Elevation gain of 2451! Now enjoy the view and take your time to hike down.