Transportation crews spent more than six hours clearing the area, which included getting the semitruck back on its wheels, connecting it to a tow truck and cleaning up the packages of shellfish.

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A semitruck carrying frozen crab tipped while heading northbound on the Alaskan Way Viaduct Monday afternoon, spilling boxes of the shellfish and causing serious traffic delays.

Transportation crews spent more than six hours clearing the area, which included getting the semitruck back on its wheels, connecting it to a tow truck and cleaning up the packages.

The semitruck’s driver lost control of the vehicle on the viaduct portion of Highway 99 near South Royal Brougham Way. The semitruck tipped around 2:30 p.m., authorities said, snarling traffic just before the evening commute.

Crews were still working to get the truck and trailer from the area around 8:45 p.m. Crews reopened both northbound lanes around 10 p.m. after Seattle City Light workers fixed a power pole that was damaged in the crash, according to tweets from the Seattle Department of Transportation.

A nearby stretch of the northbound highway, from the south end of the Battery Street Tunnel to Valley Street, remained closed overnight Monday for a separate construction project.

After the collision, officials kept both lanes of the northbound roadway closed for most of the cleanup, and for a shorter period, blocked the highway’s southbound direction.

Those closures forced drivers to take First Avenue South and Royal Brougham Way, though the backups spanning miles soon spilled onto other routes, such as eastbound West Seattle Bridge, transportation officials said.

Before opening both lanes, crews temporarily opened one and kept the other closed as engineers inspected damage to a guardrail, according to the Washington Department of Transportation.

Last March, a semitruck carrying a load of salmon overturned and blocked all southbound lanes of the Alaskan Way Viaduct. It took crews more than seven hours to clear the area.