Yes, from the parking lot in Mosier, the Tunnels are a little under a mile. Gentle uphill once you start. We've done it with a 5 and 6 year old no problem.
Its a ten mile walk from the parking lot in Mosier to the parking lot in Hood River. Beautiful senic views most of the way.
Both the sides are more than 5 miles. It's a solid hike
Under a mile i think.
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