US395/Ridgeline Drive Intersection

Project Description

This project involves the construction of an interchange at the intersection of US395/Ridgeline Drive, which includes an undercrossing structure for Ridgeline Drive to cross under US395.

With the significant amount of growth in the Southridge area, a second US395 intersection is needed between Interstate 82 and Hildebrand Road.  Currently the Ridgeline Drive intersection with US395 is restricted to not allow left turns out from Ridgeline onto US395.  This restricts the ability of adjacent properties to successfully develop without the benefit of easy access to and from their properties.

A traffic signal at US395/Ridgeline is not practical due to the steep grade of US395 and the amount of truck traffic that uses this route.

In partnership with the Washington State Department of Transportation, an underpass interchange was chosen for this location.  The project includes:

  •  Ridgeline Drive crossing underneath US395
  • On and off ramps at this location
  • An additional northbound US395 lane from Ridgeline to north of Hildebrand
  • New turning lanes at all four legs of the US395/Hildebrand intersection

The interchange project is funded with Connecting Washington funds, National Highway Freight Program funds, and a Public Works Trust Fund loan from the State.

Important Dates

 Materials from a June 2019 open house are shown below.
US395/Ridgeline Drive Project Map
Open House Flyer


The project is being advertised for construction bids from November 23, 2020 - January 6, 2021.

Following the January 27, 2021 bid opening, construction is anticipated to begin around March 2021, and estimated to be completed in the fall of 2022.

If sufficient funds exist following the interchange project, the City will construct some of the additional adjacent corridor improvement projects in 2023 (shown in orange on the conceptual design sketch).

Questions about the project may be directed to Bruce Mills, Deputy Public Works Director, at, or (509) 585-4431.


Last updated 1/11/2021