SR 21 - West Fork Sanpoil Bridge Replacement

Project news

At noon on Tuesday, July 23, crews close SR 21 at the Sanpoil Bridge to move the WWII Bailey Bridge to a temporary alignment just to the east. This will allow the previous bridge to be torn down and a new one be built in its place. The closure of SR 21 is expected to last until noon on Thursday, July 25.

On State Route 21, approximately 15 miles south of Republic, there is currently just one lane over the West Fork Sanpoil River temporary bridge. This project will construct a new permanent bridge, with construction beginning in late spring 2019. A temporary bridge will be used during construction in order to keep SR 21 open. The new bridge will be 117 feet in length, which is 60 feet longer than the existing bridge, and will have 11' lanes and 4' shoulders.

Needs & benefits

On April 8, 2017, the Sanpoil River changed course and began flowing against the south roadway embankment. The embankment was quickly washed away, resulting in the collapse of the roadway pavement leading up to the bridge. As the river continued to erode the roadway approaching the bridge, water began flowing under the south abutment footing creating a void. The bridge was inspected and it was determined, if simply repaired, this could happen again. Therefore this project will repair the stream bed, reinforce the banks and build a new bridge with a longer span and deeper foundations.

Timeline

The project is scheduled to begin June 17, 2019, and be completed in the fall of 2020.

View current construction and traffic impacts.

Funding

Financial Data for PIN 602114D
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $7,077
CWA $0
Total $7,077

Contact

Mark Allen, project engineer
2714 N. Mayfair
Spokane, WA 99207
(509) 324-6232

Location of the West Fork Sanpoil Bridge Replacement