Umbrella Falls to Timberline trail

My wife and I explored the trail a little bit but only a mile or so. Exploratory hike to get up on the mountain and see early fall color and late flowers. Should be at least 4 miles or more. Elevation gain between 500 and 700ft Carpool location Clackamas Fred Meyer 9am. I put attendee limit because in the wilderness areas groups are limited to 12. It's important to reserve a spot so that we don't unexpectedly go over limit.