SAN FRANCISCO — Two of downtown San Francisco’s familiar entrances to the Bay Bridge will close overnight beginning Sunday as Caltrans continues rehabilitation work on the bridge approach.
The First Street and Essex Street on-ramps, along with the Transbay bus ramp, are scheduled to close between 11:59 p.m. and 7 a.m. from Sunday, Aug. 30 through Wednesday, Sept. 2, according to the SFMTA weekly traffic advisory.
The important distinction is simple: the San Francisco–Oakland Bay Bridge itself is not closing. Drivers can still cross eastbound, but late-night traffic leaving SoMa and Rincon Hill may have to use a different approach and should expect reduced bridge capacity while separate overnight lane work continues.
Is the Bay Bridge closed tonight?
No. Caltrans’ ongoing bridge work is being staged through ramp closures and staggered eastbound lane reductions rather than a full bridge shutdown. SFMTA says the structural-steel and repair work generally leaves at least one eastbound lane available overnight, with all lanes reopening each morning.
That matters because a search for “Bay Bridge closed tonight” can make the situation sound much larger than it is. The practical problem is concentrated around how drivers enter the bridge from downtown San Francisco, especially after midnight.
Which San Francisco Bay Bridge ramps are closing?
| Ramp | Who normally uses it | Overnight status |
|---|---|---|
| First Street | General eastbound I-80 traffic from downtown/SoMa | Scheduled closed 11:59 p.m.–7 a.m. |
| Essex Street | General eastbound I-80 traffic from Rincon Hill/SoMa | Scheduled closed 11:59 p.m.–7 a.m. |
| Transbay bus ramp | Transit access associated with Transbay service | Scheduled closed 11:59 p.m.–7 a.m. |
The Transbay ramp is not a third ordinary car entrance. Its inclusion in the work notice is relevant to bus operations, but motorists should not interpret it as another general-purpose ramp they would normally use.
How should drivers get onto the Bay Bridge instead?
SFMTA’s current notice does not name one universal replacement ramp for the Aug. 30–Sept. 2 closures. That is a reason to follow the posted detour signs rather than build a route around an assumption that a particular nearby entrance will always be available.
Earlier in the same rehabilitation program, Caltrans directed drivers away from a closed Sterling Street ramp toward First or Essex. The reverse does not automatically make Sterling the official detour for this work window; ramp availability can change as crews move through the project.
Drivers leaving San Francisco late at night should check Caltrans QuickMap or 511 immediately before departure and allow extra time for the approach.
What does the Transbay bus-ramp closure mean for riders?
The official notice says the Transbay bus on-ramp will close overnight, but it does not say that Transbay bus service is cancelled.
Late-night riders should check their individual operator and line before traveling. A ramp closure can require an operational detour without eliminating the underlying service, and the exact impact can differ by route and hour.
Why are the ramps closing?
The closures are part of Caltrans’ continuing Bay Bridge rehabilitation work. The current project includes bridge-deck joint rehabilitation and joint-seal replacement, while separate west-span work involves structural-steel painting and spall repairs. The Caltrans San Francisco rehabilitation page collects the current project updates.
That work has produced a rolling series of late-night lane and ramp closures rather than one single construction weekend. For regular overnight drivers, that means an approach that was open last week is not necessarily the approach to assume will be open this week.
Another major freeway closure follows later this week
The Bay Bridge work is separate from the much larger northbound Highway 101 shutdown planned for Labor Day weekend. Caltrans plans to close all northbound lanes through Hospital Curve from 11 p.m. Friday, Sept. 4 until 6 a.m. Monday, Sept. 7.
Drivers using San Francisco freeways over the next week therefore have two different projects to keep straight: overnight Bay Bridge ramp work through Sept. 2, followed by the full northbound 101 closure beginning Friday night.