AboutThis project will:
- Extend the southbound acceleration lane of U.S. 97 from the U.S. 30/U.S. 97 intersection at the Biggs Jct. Interchange, and match into the U.S. 97 climbing lane a half mile south of the interchange.
- Replace the existing U.S. 97 Spanish Hollow Creek Bridge at (MP 0.39) and the Trout Creek Bridge (MP 75) to new seismic resilient bridges.
- Seismically retrofit six additional bridges over Spanish Hollow Creek near Biggs junction.
U.S. 97 South of Biggs Jct.
Cost and Funding
Estimated cost - $15 million
The retrofitting or replacements of the bridges along Spanish Hollow Creek and at Trout Creek will result in seismically resilient bridges in the U.S. 97 segment from I-84 to OR 58. This work is essential to assist with traffic mobility in the case of a major seismic event. Oregon Department of Transportation will extend the southbound acceleration lane of U.S. 97 from the U.S. 30/U.S. 97 intersection at the Biggs Jct. Interchange, and match into the U.S. 97 climbing lane a half mile south of the interchange, providing a continuous two-lane section for the first two miles of U.S. 97 south of Interstate 84.
This project will also replace the existing two-lane U.S. 97 Spanish Hollow Creek Bridge, approximately one-half mile south of Biggs Junction, to a new three-lane, seismic resilient bridge and the Trout Creek Bridge, located 17 miles north of Madras. Finally, ODOT will complete seismic retrofits of six additional bridges along U.S. 97 within first seven miles south of Biggs Jct. along Spanish Hollow Creek.
What Problem Will This Improve?
Regional lifeline route
It is anticipated that most bridges in western Oregon will suffer serious damage or destruction in a major earthquake because they were built before the existence of modern seismic codes. U.S. 97 plays a critical role in creating a resilient north-south highway corridor to support emergency response and recovery efforts in the instance of a seismic event. The eight structures included in this project were prioritized as the most seismically vulnerable structures along U.S. 97 between I-84 and OR58.
Increased capacity & freight mobility
Replacing the Spanish Hollow Creek Bridge and connecting the U.S. 97 southbound climbing lane will increase capacity into the Spanish Hollow Grade and improve freight mobility within the interchange area. It will also eliminate slow trucks from impacting the signalized intersection in Biggs Jct. and allow for the separation of trucks and vehicles as they begin their climb out of the Columbia Gorge.