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
Milepost 54.4 and milepost 56
Cost and Funding