Mosier Twin Tunnels

"7/14/25 On Historic Columbia River Highway
Close at 9pm
This trailhead provides the most direct access to the tunnels, making for a 2mi(1hr) round trip hike.
From this trailhead, you'll reach the tunnel entrance within about a mile. And hike back the way you came.
Start in the town of Mosier, from the east end of Historic Columbia River Highway State Trail, for the shortest hike to the entrance.
Starting in the east, the hike begins from Senator Mark O. Hatfield Trailhead on Rock Creek Road about 3/4 of a mile from Interstate 84 in Mosier. You’ll actually pass the bottom of Historic Columbia River Highway State Trail on the right, but there is only room for handicapped parking at the bottom of the old road. The general public starts from a larger parking area a little farther up Rock Creek Road.
Set out from the parking lot and walk back along the road, following diamonds painted on the pavement. Use the crosswalk to switch to the left side of the road and continue downhill. Follow the walkway on a paved arm that temporarily parts from the road, rejoining it at the intersection with Historic Columbia River from the parking lot and walk along the road,
Follow diamonds painted on the pavement.
Use the crosswalk to switch to the left side of the road and continue downhill. Follow the walkway on a paved arm that temporarily parts from the road, rejoining it at the intersection with Historic Columbia River Highway State Trail. Turn left and begin up the wide paved trail. Pass a small handicapped parking area and come to an information panel and gate at the start of the trail. (less than a quarter mile from your actual starting point).
After 0.85 miles of hiking, and a tenth of a mile before the tunnels, find a spur on the right out to a stone overlook. Take it and walk a short distance to a round vista point. Explore big views from this location.
Make your way through the long eastern tunnel, pass through a small opening in between, and enter the western tunnel. Metal gates prevent you from straying out on the cliffs between the tunnels. The shorter second tunnel has wood paneling that frames the walls and ceiling. If you’re only interested in a short outing, you could turn around after the second tunnel for a hike of just over two miles round trip.
Then go thru to the West tunnel. Once through, you can hike back to where you came from. It'll be just over a 2 mi. 1 hr. hike round trip."

Orrin H

"It's a really nice walk to these tunnels. At the trailhead, there is a decent parking lot with a pit toilet. The trail is paved wide and relatively flat. Great for walking and biking. I would say it is about a mile to the tunnels. They are really neat to walk through and imagine 2 lanes of traffic trying to fit through them. There are also good views of the Columbia River valley from the "windows" in the tunnels."

Jeremy

"This is such a nice ride. We have pedal-assist so it was easy, but it is a moderate uphill until the crest (then, of course, a zippy coast down). There was plenty of shade on the Hood River side, but the tunnels are closer to Mosier, where we started. Very fun ride."

Jane Saulnier