SAN FRANCISCO (CBS SF) – An early morning drywall spill in Downtown San Francisco has caused major backups on the upper deck of the Bay Bridge.

According to authorities, a truck carrying a drywall mixture spilled its load on Westbound Interstate 80 at Fremont Street shortly before 4:00 a.m.

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The CHP was forced to close nearly all westbound lanes and traffic was diverted to surface streets. That caused a major backup that extended across the Bay Bridge to the Toll Plaza in Oakland.

Chopper 5 over a backup on the Bay Bridge Toll Plaza, resulting from a drywall spill on Interstate 80 at Fremont Street in San Francisco on December 18, 2015. (CBS)

Chopper 5 over a backup on the Bay Bridge Toll Plaza, resulting from a drywall spill on Interstate 80 at Fremont Street in San Francisco on December 18, 2015. (CBS)

Authorities opened up all westbound lanes around 6:45 a.m., but traffic at the Toll Plaza remains backed up.

Earlier this week, the Metropolitan Transportation Commission once again declared Westbound Interstate 80 from Hercules to the Bay Bridge Toll Plaza as the most congested Bay Area commute.

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