Caltrans will shut down westbound Interstate 580 from the Richmond Parkway off-ramp to the Main Street off-ramp in Marin County from 11 p.m. Saturday to 8 a.m. Sunday. The eastbound lower deck will remain open, and residents will still have access to Stenmark Drive along the Richmond shoreline. The bridge's bike path will be closed from 9 p.m. Saturday to 8 a.m. Sunday.

The closure will allow crews to reconfigure the toll booths next month so they can be torn down in April. Once complete, drivers will pass beneath an array of cameras and sensors aimed at FasTrak transponders in each windshield, paying tolls without slowing down.

Crews have spent months re-striping lanes and installing temporary construction rails to accommodate the new equipment. The Richmond-San Rafael Bridge is the first of the region's seven state-owned bridges to convert to open-road tolling.

Caltrans officials acknowledged the work will disrupt travel between the East Bay and Marin County. The bridge, flanked by an oil refinery and San Quentin State Prison, has long been a target of criticism for its appearance and occasional debris falling from its upper deck. But the project marks a significant modernization for the span.

The overnight closure is scheduled to begin at 11 p.m. Saturday and end at 8 a.m. Sunday.