The Department of Transportation says difficult repairs and wet, cold and windy weather has pushed back the scheduled reopening of the northbound State Route 529 bridge over the Snohomish River.
Crews will not be able to reopen the popular route between Everett and Marysville until mid-morning on Tuesday, a day later than previously planned.
A Saturday morning crash on the bridge just north of Marine View Drive severely damaged two steel beams that support the bridge deck.
"The impact of the SUV did significant structural damage to vertical and diagonal support beams," said Dave McCormick, assistant regional administrator for maintenance and operations.
The structure is a steel truss bridge built in 1927. On a typical weekday, the bridge carries 15,000 vehicles per day.
The DOT says drivers who use the northbound bridge must use I-5 and should plan for delays during Monday's evening commute.
The connection is a key link between Everett and Marysville. The southbound lanes, which are on a second, unconnected bridge remain open to traffic.
Repairs are estimated to be $30,000 and WSDOT's Risk Management group will pursue reimbursement through the vehicle owner's insurance company.