14-Hour, I-280 Northbound & Southbound Lane Reductions Scheduled Between Mariposa St. and the I-280/101 Interchange

Reductions begin Friday, Sept. 11, 10 pm to Saturday, Sept. 12, 12 pm

San Francisco County - Caltrans will reduce lanes on southbound and northbound I-280 to allow crews to repair areas of unsound concrete on the freeway. Lane reductions will begin Friday, September 11, at 10 p.m. and remain in place until Saturday, September 12 at 12 pm. During this work window, two of the three lanes in each direction will be closed, leaving one lane per direction open to traffic. Lane closures will be delayed and/or adjusted to accommodate Oracle Park and Chase Center game traffic.

This weekend's work is part of an ongoing series of weekend closures requiring similar lane reductions. These lane reductions are part of the I-280 and Farallones Street Pedestrian Overcrossing Rehabilitation Project in San Francisco, announced earlier this month.

Scope of the I-280 & and Farallones Street Pedestrian Overcrossing Rehabilitation Project
Part of the "Fab 4" infrastructure rehabilitation, this comprehensive two-year project will deliver vital safety, accessibility, and structural upgrades to the heavily traveled I-280 corridor. This includes replacing the aging pedestrian Whipple Avenue bridge and performing major upgrades along I-280 freeway between St. Charles Avenue and Brannan Street. When the bridge is completed, it will be renamed the Farallones St. Pedestrian Overcrossing given its proximity to Farallones Street.

Farallones Street Pedestrian Overcrossing
The new structure will be ADA compliant and designed to current seismic standards. The structure will have appeasing aesthetics to blend with the community and terrain, gentler slopes, and improved lighting. The entrances to the new structure will remain the same. Work on the new structure is anticipated to begin towards the end of summer.

Multiple full freeway closures in one direction at a time are required for this work. All full closures will be overnight for up to 10 hours each. Full closure schedule is not determined yet. Public and community will be informed when closure schedule is determined.

Pavement Repair

• Concrete Pavement: Damaged concrete slabs at the St. Charles Avenue overcrossing will be replaced. This work will begin next week.

Bridge Deck Repair
Damaged sections of the bridge deck between U.S.101 and Mariposa will be repaired and then overlayed with 1-inch of polyester concrete. Twelve 55-hour weekend lane reductions will be implemented for this work. This work will begin this fall.

Weekend Freeway Closures & Lane Reductions: Full freeway closures (overnight) and 55-hour lane reductions are required for this work. The public will be informed in advance of these closures.

Driver and Community Benefits
Once complete, the project will:

• Deliver a beautiful, ADA-compliant pedestrian overcrossing
• Preserve and extend the life of the I-280 freeway corridor
• Improve ride quality and driving comfort
• Enhance overall freeway safety

Stay Informed For the latest updates visit sfhighwayprojects.com. The webpage will be updated as schedules are confirmed.