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Stillaguamish Bridge (L) (built 1933) and the bridge carrying the northbound lanes (built 1971) (R) (February 10, 2021). Photo: WSDOT

Traffic alert: Expect back-ups on I-5 in Snohomish County during the next 5 months

SNOHOMISH COUNTY, Wash. — Officials with the Washington Department of Transportation are warning drivers to expect delays on I-5 while work is being done to repair and paint a bridge that carries southbound I-5 traffic over the Stillaguamish River in Snohomish County.

Beginning Monday, June 21st, and for approximately 5 months following, all 3 lanes of southbound I-5 will be diverted onto a 2-lane median bypass on the adjacent northbound I-5 bridge. This will also reduce northbound traffic from 3 to 2 lanes through the work area.

The speed limit through the work area will be reduced to 55mph from 70mph.

WSDOT officials warn, “Travelers should anticipate increased congestion and back-ups during peak commute hours” while the bypass is being used.

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Work area bypass shown in blue. Graphic: WSDOT

The Stillaguamish River Bridge, built in 1933, will be painted to preserve and protect its aging structure. Minor maintenance and repairs will also be performed including replacing joints and rivets.

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