For more information on the Central Subway Project, please see our website.

The video shows TBM Mom Chung breaking into the water-filled retrieval shaft last June. The water is drained from the shaft for the arrival of TBM Big Alma. The departure of the machines comes next as workers remove both TBMs, piece by piece, over several months. The retrieval shaft site was restored and vacated in January 2015.

A metal cover was installed as the final step in restoring the site.

For more information about the project and construction progress, follow us on Facebook, Twitter, Flickr, YouTube and check out our project website.

Two workers clean a hydromill at the future Chinatown Station location. When opened in 2019 this station will increase transportation options.

During the next 10 days, Central Subway work continues at sites in SoMa, Union Square, Chinatown and North Beach. This post contains brief updates about recent construction activities and a look-ahead for what to expect in each neighborhood. For more detailed information, click here or on the links below. You can also find construction, traffic detour, and Muni impact information on our project Google Map.

Check out the new project construction video on YouTube posted here.

Construction schedules may change due to unforeseen conditions. We encourage the public to follow all traffic and pedestrian notifications posted at the work sites.

Southern SoMa (Harrison to King): Construction crews are relocating and installing new utilities along 4th Street from Harrison to King streets.

• At the intersection of 4th and Harrison streets, work on utilities is scheduled to start Monday, Oct. 20.
  • Two traffic lanes will remain open Monday to Friday, 7 a.m. to 5 p.m.
  • Access to Interstate 80 freeway may be limited on some evenings between 8 p.m. and 5 a.m.
• On 4th Street between Bryant and Brannan streets, installation of a sewer line continues.Two traffic lanes will remain open Monday to Friday, 7 a.m. to 3:30 p.m.

Northern SoMa (Market to Harrison): Construction crews are building walls and replacing a water line along 4th Street between Howard and Folsom streets.

• Tentative: Along 4th Street between Folsom and Harrison streets, sewer line replacement to start Oct. 28.

Union Square: Construction crews are excavating the site, building station walls and relocating utilities on Stockton Street between Ellis Street and Maiden Lane.

Chinatown: Construction crews are building station walls and installing new utilities on Stockton Street between Sacramento and Washington streets.

North Beach: Construction crews continue to restore the retrieval shaft site.

We thank the businesses, residents, shoppers, and commuters of San Francisco for their continued engagement with this significant investment in the extension of our public transportation system. When opened in 2019, the Central Subway will provide a much-needed connection between major employment, retail, cultural and residential areas of the city.

Ongoing construction can be seen here at the Yerba Buena/Moscone Station site.

During the next 10 days, Central Subway work continues at sites in SoMa, Union Square, Chinatown and North Beach. This section contains brief updates about what is happening in each neighborhood. For more detailed information, click here or on the links below. You can also find construction, traffic detour, and Muni impact information on our project Google Map. In addition, we have a new construction video here. For safety reasons, we encourage the public to follow all traffic and pedestrian notifications posted at the work sites.

Southern SoMa (Harrison to King/Berry): On Brannan and Townsend streets between 4th and 5th streets, work on utilities continues. Sewer line installation starts August 4 on the west side of 4th Street between Brannan and Welsh streets. One parking lane and one traffic lane of this section will close from 7 a.m. to 5 p.m. Temporary walkways are in place around the construction zones.

Northern SoMa (Market to Harrison): At 4th and Folsom, work to build the Yerba Buena/Moscone Station continues. This includes construction of the station walls within the work site and water line replacement at the intersection of 4th and Folsom. 4th Street from Howard to Folsom streets continues to have a lane reduction overnight from 7 p.m. to 5 a.m.

Union Square: Stockton Street between Ellis and Geary is closed to vehicular traffic to allow for construction of the Union Square/Market Street Station. Work is underway for pile installation to construct the station walls. The west side of Stockton Street between Post and Geary is anticipated to reopen to one lane of traffic on August 8. Until then, please use alternate routes and follow construction signs.

Pile installation takes place at the southwest intersection of Stockton and O’Farrell streets until late August. One lane of travel will be open. Expect delays and please use alternative routes.

Muni service impact:
The bus stop at Geary and Stockton will be temporarily discontinued until September. Please board bus at Geary and Powell. Please check back on our weekly Construction Update for the most current information on the re-opening of this stop.

Chinatown:  The contractor started station wall construction at the future station site and on the adjacent section of Washington Street. Work to replace high pressure water pipeline and install new fire hydrant on Washington is ongoing. A section of the sidewalk at the northeast corner of the Washington and Stockton intersection will be demolished in order to install a new fire hydrant.

North Beach: Work continues at 1731-1741 Powell. Street restoration has been completed on Columbus Avenue between Filbert and Union. Sustainable Streets is installing new street lights and landscaping within the median on this portion of Columbus Avenue.

We thank the businesses, residents, shoppers, and commuters of San Francisco for their continued engagement with this significant investment in the extension of our public transportation system.