The agency said via Twitter that drivers should avoid the area or expect delays.
WSDOT suggested the following alternate routes:
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Southbound traffic: Take eastbound State Route (SR) 20, then south on South Burlington Boulevard and west on East College Way (SR 538) to southbound I-5
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Northbound traffic: Take eastbound East College Way to northbound Riverside Drive-South Burlington Boulevard, then west on George Hopper Road to I-5.
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SR 9 to bypass Mount Vernon: Take Exit 221 at SR 534 east to northbound SR 9 to SR 20 westbound to I-5.
The map to the right shows the alternate routes. The map is also available at wsdot.wa.gov.
Authorities have not announced any specific replacement plans for the I-5 bridge over Skagit River.