The Mosier Tunnels bike trail.
Just east of The Dalles, Oregon First built in 1919 and 1920.
Later bypassed by I-84. Recently restored with new wood planking along
the sides. Very nice bike and pedestrian path.
Tunnels on my Flickr.
East of Hood River, one finds
the Historic Columbia River Highway State Trail. Senator
Mark O. Hatfield West Trailhead.
Leads to the Mosier Twin Tunnels.