The Park Street Bridge remains completely closed to pedestrians, bicycle and motor vehicles from 8:30 p.m. to 5 a.m., Sunday through Thursday until Thursday, Aug. 13. A detour will rout vehicles over the Fruitvale Bridge.

The closures will also affect vessel traffic on the estuary; large vessels that need both the bridge’s leaves open will be required to provide at least two hours’ advance notice.

The 80-year-old bridge handles more than 38,000 vehicle trips per day. It received a $5.6 million upgrade in 1998 and a seismic retrofit in 2009. Project updates are available on the Alameda County Public Works Agency’s website.