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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.

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Traffic Impact

Construction has begun. Expect 24 hour flagging and delays. 

Construction Impacts

What's being built!The project is expected to take two seasons. 

For 2021 (through 12/2021), there will be 24 hour single lane closures controlled by flaggers through the work zone. The travel lane will typically be 15 feet wide.

You can expect:

  • Delays from lane closures.
  • Construction noise.
  • Flaggers between milepost 55.5 and milepost 56.5. 
Upcoming Schedule of Work: 

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.

¿Hablá español? Para obtener más información sobre el proyecto leía este documento​.

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

9/10/2021 3:40 PM

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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