• Arch Cape Tunnel - Cannon Beach OR
    In February 1936, to complete the portion of Highway 101 between Cannon Beach and Manzanita, the Oregon Highway Department approved construction plans for a 1227-foot-long tunnel through Arch Cape. The federal Public Roads Administration provided critical funding for the project. At the time of its construction, it was the longest tunnel on the Oregon Coast Highway. Difficulties associated with the long bore through both the cape's sandstone and basalt stretched the construction project out over almost four years. The presence of soft sandstone required the construction of a timber lining to prevent a cave-in. Construction workers struggled with difficult conditions including exposure...