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U.S. 101 Bridge Protection and Repair Project - Neahkahnie Mountain Bridge, Cape Perpetua Half Viaduct, and Cape Creek Bridge

Construction Phase

Region 2: Willamette Valley and Northwest Oregon (Florence, Tillamook, Yachats, Lane, Lincoln, Tillamook)

​Three bridges on the Oregon Coast will be repaired and protected.​

Construction Banner


Traffic Impact

​Traffic control will be needed. Lane restrictions will vary by location but will be timed to accommodate coastal traffic.

Neahkahnie Mountain Bridge- work is complete.

Cape Perpetua Bridge- No work being done at this time.

Cape Creek Bridge, (North of Florence):  Expect single lane closures with minimal impacts as crews work on installing containment and bridge repairs on the south half of the bridge.


​Construction estimated to continue until late 2020



​These bridges are valuable to the history of Oregon and add to the aesthetic beauty of the Oregon Coast Highway. The Cape Creek Bridge is listed on the National Register of Historic Places and the other two bridges are eligible for listing.

​Repairs are needed to protect these historic bridges from deterioration from their age and the harsh coastal environment.  The bridges will require a variety of work, including concrete and steel repairs, painting, and cathodic protection.

​In cathodic protection, concrete bridge surfaces are sprayed with a zinc coating. This prevents the inner steel structural reinforcements of the bridge from corroding in the coastal air. Basically, the zinc coating is designed to corrode instead of the steel.

Neahkahnie Mountain Bridge, north of Manzanita: A rockfall fence is being added to prevent rocks and debris from falling onto the highway, along with bridge repair work.

Neahkahnie Mt rock screen -web.jpgThe new rockfall fence is a dynamic system meant to move and absorb impact from material that falls down the cliff. It is thicker and more robust than the static fencing on either side that is designed to hold the cliff in place. The new fence will protect the bridge by channeling rocks down the cliff. The color will fade over time. 

Cape Perpetua Bridge, south of Yachats: A new cathodic protection system is being installed, including a wide turbine generator under the bridge to power the system.

Cape Creek Bridge, north of Florence: A new cathodic projection system is being installed, along with bridge repair work. ​


U.S. 101 | mileposts 178.33, 166.46, 40.71

Cost and Funding


Contacts & Media

Project Contacts

Resident Engineer
Shane Prohaska

Public Information Officer
Angela Beers Seydel

Last Updated

4/30/2020 4:40 PM

Project Number


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