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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.

OOH Construction Banner


Traffic Impact

​None at this time. The project will begin early August.

Construction Impacts

What's being built!During construction there will be a 24 hour single lane closures controlled by flaggers through the work zone. The project is expected to take two seasons and will start in July 2021.

In addition to lane closures, during the first season in 2021 there will be a three day full closure of the road in September after Labor day weekend. 

In May 2022, th​ere will be a two week full closure of the road before Memorial Day weekend. Exact dates will be shared two weeks prior to the closures.​​ will have the most up to date information on road conditions and closures.

This project​ is being managed by Western Federal Lands.

Access for pedestrians, including those with disabilities, will be available and identified through or around work zones.



​​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

7/27/2021 10:11 AM

Project Number


Project Documents

Related documents to this project
20807-U.S.20-Landslide-Repairs_Flyer.pdfU.S. 20 Landslide Repair Flyer
20807-Reparación-de-U.S.20-por-derrumbes-Español.pdfReparación de U.S.20 por derrumbes - Español

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