As California's 511.org reports, the San Francisco-Oakland Bay Bridge:
Is closed in both directions until further notice, and Caltrans currently estimates it will remain closed for the Friday morning commute. Caltrans crews are working to reopen the Bay Bridge as quickly as possible, with a goal of reopening the span sometime on Friday. Motorists are advised to plan ahead for commute alternatives for the Friday morning commute.
On Tuesday, a steel crossbeam and two steel tie rods crashed on to the span's upper deck. Ironically, the pieces came off a section that had been "repaired" in September.
On Morning Edition, NPR's Richard Gonzales reported about the bridge's woes — it's just about reached its expected lifespan — and commuters' anxious wait for it to be fixed.