SF I-80 Ramp Closes for Viaduct Upgrades

Eastbound I-80 4th Street off-ramp in San Francisco closes Feb 20-23 for viaduct work

I-80 Off-Ramp Closes for Weekend Construction

Drivers who use the eastbound I-80 4th Street off-ramp in San Francisco will need alternate routes this weekend. The exit closes completely from Friday, February 20, through Monday, February 23, transportation officials said. The closure affects a key access point in the metro area as crews work on the U.S. 101 Central/I-80 Bayshore Viaduct improvements.

Viaduct Project Drives Weekend Shutdown

The off-ramp closure is part of ongoing construction on the U.S. 101 Central/I-80 Bayshore Viaduct, a critical infrastructure corridor connecting San Francisco and the East Bay. Officials announced the closure February 6 and classified it as a high-severity traffic event due to the ramp's heavy use by commuters and commercial vehicles. Transportation agencies typically schedule such closures during weekends to minimize weekday commuter impact, though the Friday start means some rush-hour travelers will be affected. Officials didn't specify how many vehicles typically use the ramp daily.

72-Hour Closure Spans Long Weekend

The closure begins Friday, February 20, and continues through Monday, February 23, giving construction crews a 72-hour window to complete viaduct improvement work. Officials said the extended closure allows contractors to work continuously without interruption, which can reduce overall project timelines. Specific details about what construction activities will occur during the closure weren't provided. The 4th Street off-ramp serves as a primary access point for downtown San Francisco and surrounding neighborhoods, though officials haven't released information about expected traffic volumes on alternate routes.

Detours Begin Friday Evening

The off-ramp closure takes effect Friday evening, February 20, and remains in place until Monday, February 23, though officials didn't specify exact times for the closure start and end. Drivers should expect the ramp to be inaccessible throughout the entire weekend period. Transportation officials said they'll have detour signage in place to guide motorists to alternate exits, though specific detour routes weren't detailed in the announcement.

Drivers Should Plan Alternate Routes

Motorists who regularly use the eastbound I-80 4th Street off-ramp should identify alternate exits before the Friday closure begins. Officials said drivers should expect delays in surrounding areas as traffic redistributes to other ramps and surface streets. Moovit provides real-time traffic updates and alternate route suggestions for Bay Area drivers navigating construction-related closures. The transportation agency said additional information about the viaduct improvement project will be released as work progresses.