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U.S. 20 Landslide Repairs (Lower and Upper Sunken Grade Slide Repairs)

Construction Phase

Region 2: Willamette Valley and Northwest Oregon (Linn)

​​​​​​​​​​​​​​​​​​​​We are repairing two slide areas west of Sheep Creek.

Construction Banner


Traffic Impact

None at this time.

Construction Impacts

Most of the remaining work will be done off the road. 

We will return to finish the remaining curb work, requiring single lane closures, on Oct. 7 and Oct. 10.​has the most up to date information on road conditions and closures.

This project​ is being managed by Western Federal Lands.



​​We have been investigating a portion of U.S. 20 east of Sweet Home and along the South Santiam River to decide the best solution to mitigate the slide movement in the area.

The recommended repairs for the Double Gate and Upper Sunken Grade slide areas is to regrade and/or realign the road and build a retaining wall. We are ​also conducting further tests at milepost 53.7, but we have no construction planned at this time due to lack of funding.

Road Realignment and Retaining Wall Construction (milepost 56 - 56.2):

We'll install a retaining wall on U.S. 20 to slow the movement of the landslide. The wall will be located along the inside of the horizontal curve in the roadway and will need a minor roadway realignment slightly toward the uphill side. The wall will isolate the roadway from the landslide mass to prevent further movement of the roadway. As part of the work we will reconstruct 1,000 feet of roadway to establish the new alignment and grade. 

Road Reconstruction (milepost 55.4 - 55.6):

Many horizontal drains were installed in 2019 to help water flow through the area. The current project will regrade and reconstruct the roadway at this site which has seen significant settlement.​

Meetings and Events

Visit our archived online open house​ to learn about this project and other projects being built in 2021.


U.S. 20 |

​Milepost 54.4 and milepost 56

Cost and Funding

​$4.96 million ​

Contacts & Media

Project Area Map

Project Contacts

Transportation Project Manager
Julie GaNung

Public Information Officer
Angela Beers Seydel

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Last Updated

10/4/2022 10:45 AM

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