Yerba Buena Island eastbound off-ramp changes take effect June 22, 2023

Westside Bridges Retrofit Project begins

The San Francisco County Transportation Authority, in collaboration with Federal Highway Administration, Caltrans, Bay Area Toll Authority and the Treasure Island Development Authority, will begin construction on the West Side Bridges Retrofit Project on Yerba Buena Island. The construction will necessitate the closure of the #1 lane eastbound off-ramp from the lower level of the Bay Bridge to Yerba Buena and Treasure Islands.

The closure of the eastbound off-ramp is part of a series of traffic changes coming to Yerba Buena and Treasure Islands as the Transportation Authority, TIDA and Caltrans, retrofit roads and on-/off-ramps that connect the islands to the Bay Bridge. The #1 lane eastbound off-ramp to Yerba Buena and Treasure Islands will be closed until December 2026.

There are traffic circulation changes associated with the Project

With the closure of this off-ramp, motorists will need to change their driving habits to utilize the new Southgate Off-ramp, which was opened on May 7, 2023, as follows:

• The new Southgate off-ramp is located along the right side (#5 lane) of the eastbound lanes of the Bay Bridge (lower deck) immediately after the Yerba Buena Island Tunnel.
• Motorists are advised to adhere to the 50 MPH posted speed limit on the Bay Bridge and the 15 MPH speed limit on the off-ramp.
• Motorists travelling to Treasure Island will follow the gently curving off-ramp to the stop sign at the intersection with Macalla Road, proceed forward over the hill on Macalla Road until it intersects with Treasure Island Road and turn right to go to Treasure Island.

A Caltrans-produced video available here on You Tube demonstrates the recent and upcoming changes to eastbound off-ramp access to Yerba Buena Island

The traffic circulation changes will extend MUNI 25 travel times

Beginning June 17, the 25 Treasure Island bus will see longer travel times due to this construction, which will affect frequencies. The line will run every 20 minutes on weekdays and every 30 minutes on weekends.

For more information, visit SFMTA.com/25

Sign-up for e-mail and SMS alerts for 25 Treasure Island service

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