Road Work to Close Access through Wahanna

UPDATE – July 28, 2023 – A critical culvert and road construction project will continue to close north/south access on S. Wahanna Road at Coho Creek near the Wahanna Ballfields and affect traffic patterns into August. The road is now estimated to reopen by Monday, August 14.

The project began the last week of June, closing S. Wahanna Road to northbound traffic just past Spruce Drive and to southbound traffic just past the Wahanna Ballfields. Until the road is reopened, access to Seaside Providence Hospital is via Broadway, 12th Avenue, or Lewis and Clark Road to Wahanna. Access to Seaside schools is via Avenue S. Signs are posted along US Highway 101 (Roosevelt Drive) and S. Wahanna to alert and remind motorists.

Coho Creek is a tributary to Neawanna Creek that had run through a 36-inch corrugated steel culvert under S. Wahanna. The culvert and two additional degraded and partially blocked culverts immediately upstream are being removed and replaced. A 19-foot bottomless arch culvert is being installed beneath S. Wahanna, which will help control flooding within the local waterways and enhance passage of native fish, including coho, Chinook, chum, Pacific lamprey, winter steelhead and cutthroat trout.

Project update photos by Seaside Public Works.

UPDATE – July 18, 2023 – North/south access on S. Wahanna Road at Coho Creek remains closed for a critical culvert and road construction project. Crews have completed clearing, stream diversion, installation of erosion control, and set the footing block. Culvert construction is currently underway. The roadway is estimated to be reopened by the first week of August.

SEASIDE, Ore. – June 21, 2023 – A critical culvert and road construction project will affect traffic patterns in Seaside and close north/south access on S. Wahanna Road at Coho Creek near the Wahanna Ballfields beginning Monday, June 26. The closure is estimated to last five weeks, and estimated to open by August 1.

During construction, S. Wahanna Road will be closed to northbound traffic just past Spruce Drive and closed to southbound traffic just past the Wahanna Ballfields. Access to Seaside Providence Hospital will be via Broadway, 12^th Avenue, or Lewis and Clark Road to Wahanna. Access to Pacific Ridge, and the Seaside Middle/High schools will be via Avenue S. Signs will be posted along US Highway 101 (Roosevelt Drive) and S. Wahanna to alert and remind motorists throughout the project.

Coho Creek is a tributary to Neawanna Creek that currently runs through a 36-inch corrugated steel culvert under S. Wahanna that needs replacement, along with two additional degraded and partially blocked culverts immediately upstream that must be removed. The project will install a 19-foot bottomless arch culvert beneath S. Wahanna, which will help control flooding within the local waterways and enhance passage of native fish, including coho, Chinook, chum, Pacific lamprey, winter steelhead and cutthroat trout.

The City of Seaside and Necanicum Watershed Council have worked with partners at the Oregon Department of Fish and Wildlife, Oregon Watershed Enhancement Board, and the Pacific Lamprey Foundation since 2016 to secure funding for this project. This information and any updates can be found on the city’s website, cityofseaside.us.

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