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SFMTA’s Central Subway will connect San Francisco’s southeast neighborhoods to downtown and Chinatown. Whether you’re a concerned citizen, business owner, Muni customer, or just stumbled onto our blog, we welcome your questions and encourage you to connect with us. Follow us for the latest Central Subway news and information.

24 October 2014 ~ 0 Comments

Project Advancements | October 24 – November 3, 2014

Station walls are being constructed at the future Chinatown Station. When opened in 2019, this station will increase transportation options.

Station walls are being constructed at 933-939 Stockton Street for the future Chinatown Station.

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.

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.

  • Tentative: At the intersection of 4th and King streets, potholing work on Nov. 3 and 4.
    • Night work between 7 p.m. and 5 a.m.
  • At the intersection of 4th and Harrison streets, work on a high pressure water line continues.
    • Two traffic lanes will remain open Monday to Friday, 7 a.m. to 3 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, potholing and 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 by the end of October.

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.

17 October 2014 ~ 0 Comments

Project Advancements | October 18 – October 27, 2014

Two workers attempt to unclog a hydromill at the future Chinatown Station location. The future Chinatown Plaza that will sit on top of this Central Subway station will provide much needed open space for the community.

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 SquareConstruction 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 BeachConstruction 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.

10 October 2014 ~ 0 Comments

Project Advancements | October 11 – October 20, 2014

At the future Union Square/Market Street Station, workers continue constructing the roof deck. Access to the current Muni and Bart stations will be available at this location.

At the future Union Square/Market Street Station, workers continue constructing the roof deck. Access to the current Muni and Bart stations will be available at this location.

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.

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 Bryant to King streets.

  • On Monday, Oct. 13 from 8 p.m. to 4 a.m., 4th Street between Harrison and Bryant streets will be closed.
    • For more information, click here.
  • 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.
  • On Welsh Street and on Freelon Street at 4th Street, sewer manhole work to begin.
  • On Bryant Street between 5th and Zoe streets, installation of a sewer.
  • On 4th Street at Bluxome Street, installation of an AT&T vault.

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

  • Tentative: Along 4th Street between Folsom and Harrison streets, sewer line replacement to start Oct. 15.

Union SquareConstruction 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 BeachConstruction crews continue to remove the remaining associated equipment and restore the 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.

 

03 October 2014 ~ 0 Comments

Project Advancements | October 4 – October 13, 2014

Workers at 1731-1741 Powell Street continue working on dismantling the tunnel boring machine (TBM) Mom Chung. The tunnels that were constructed by the TBMs are approximately 20 feet in diameter.

Workers at 1731-1741 Powell Street continue working on dismantling the tunnel boring machine (TBM) Mom Chung. The tunnels that were constructed by the TBMs are approximately 20 feet in diameter.

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.

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 Bryant to King streets.

  • On 4th Street between Bryant and Brannan streets, sewer line installation to start Oct. 8.
    • Two traffic lanes will remain open Monday to Friday, 7 a.m. to 5 p.m.
  • On Welsh Street at 4th Street, sewer manhole work.
  • On Freelon Street at 4th Street, sewer manhole work.
  • On Bryant Street between 5th and Zoe streets, installation of a sewer.
  • On 4th Street at Bluxome Street, installation of an AT&T vault.

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

  • Along 4th Street between Folsom and Harrison streets, sewer line replacement scheduled to start Oct. 8.
  • On 4th Street between Howard and Folsom streets, one traffic lane remains open.

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

  • On Stockton Street at O’Farrell Street:
    • One traffic lane will remain open.
    • Sidewalk closure on the north side of O’Farrell Street scheduled overnight 10 p.m. to 6 a.m. through the end of October.
  • On Stockton Street at Geary Boulevard:
    • One traffic lane will remain open.
    • Crosswalk on the south side of Geary Boulevard is temporarily closed.
    • Muni service impact: Bus stop at Geary Boulevard and Stockton Street temporarily discontinued until mid-November. Board bus on Geary Boulevard at Powell Street.

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

North BeachConstruction crews continue to remove the remaining tunnel boring machine, associated equipment and restore the site.

  • Sewer cleaning on Columbus Avenue between Union and Filbert streets.

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.

26 September 2014 ~ 0 Comments

Project Advancements | September 27 – October 6, 2014

 

On Stockton Street near O'Farrell Street, the crew continues with construction of the Union Square/Market Street Station. This station will provide an access point for numerous transportation options when it opens in 2019.

On Stockton Street near O’Farrell Street, the crew continues with construction of the Union Square/Market Street Station. This station will provide an access point for numerous transportation options when it opens in 2019.

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.

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 Bryant to King streets.

  • Tentative: On 4th Street between Harrison and Bryant streets, overnight closure of the street scheduled for Wednesday Oct. 1 from 8 p.m. to 5 a.m.
  • On Freelon Street at 4th Street, sewer manhole work to start Sept. 29.
  • On Bryant Street between 4th and Zoe streets, installation of a sewer.
  • On 4th Street at Bluxome Street, installation of an AT&T vault.

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

  • Along 4th Street between Folsom and Harrison streets, sewer line replacement scheduled to start Oct.1.
  • On 4th Street between Howard and Folsom streets, traffic is reduced to one traffic lane until late November.

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

  • On Stockton Street at O’Farrell Street:
    • Reduction to one traffic lane.
    • Sidewalk closure on the north side of O’Farrell Street scheduled overnight 10 p.m. to 6 a.m. through the end of October.
  • On Stockton Street at Geary Boulevard:
    • Reduction to one traffic lane.
    • Crosswalk on the south side of Geary Boulevard is temporarily closed.
    • Muni service impact: Bus stop at Geary Boulevard and Stockton Street temporarily discontinued until late November. Board bus on Geary Boulevard at Powell Street.

Chinatown: Construction crews are building station walls and installing new utilities at 933-949 Stockton Street between Clay and Washington streets.

North Beach: Construction crews continue to remove the remaining tunnel boring machine (TBM) and restore the site.

  • On Columbus Avenue between Union and Filbert streets, installation of street lighting and sewer cleaning.

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.

19 September 2014 ~ 0 Comments

Project Advancements | September 20 – September 29, 2014

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On Brannan Street near 4th Street, workers continue excavating.

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.

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 Bryant to King streets.

  • On Bryant Street between 4th and Zoe, installation of a sewer scheduled to start Sept. 22.
  • On 4th Street between Brannan and King:
    • Sewer line cleaning continues.
    • At Bluxome Street, installation of an AT&T vault scheduled to start Sept. 22.

Northern SoMa (Market to Harrison): Construction crews are building walls and replacing a water line along 4th Street from Howard to Folsom streets. Replacement of a sewer line along 4th Street between Folsom and Harrison is scheduled to start Oct. 1.

  • On 4th Street between Howard and Folsom:
    • Traffic reduced to one traffic lane.
    • At Clementina Street, closure to through traffic.
    • At Folsom Street, replacement of water line continues.
  • On 4th Street between Folsom and Harrison:
    • Replacement of sewer line on the east side of 4th Street.
    • Parking will be impacted in the vicinity of the work area.

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

  • On Stockton Street between Ellis and Post:
    • Ellis Street to Geary Boulevard, closed to vehicular traffic.
    • At O’Farrell Street, reduction to one traffic lane.
      • Sidewalk closure scheduled overnight 10 p.m. to 6 a.m. for the next few weeks.
    • At Geary Boulevard, reduction to one traffic lane.
      • The crosswalk on the south side of Geary Boulevard is temporarily closed.
      • Muni service impact: Bus stop at Geary Boulevard and Stockton Street temporarily discontinued until early October. Board bus on Geary Boulevard at Powell Street.
  • On Ellis Street between Stockton and Powell:
    • Ellis Street is temporarily closed to westbound traffic.

Chinatown: Construction crews are building station walls and installing new utilities at 933-949 Stockton Street between Clay and Washington streets.

  • On Washington Street between Stockton and Trenton:
    • Street is closed to through traffic.
  • On Washington Street between Stockton and Spofford:
    • Replacement of water pipeline continues.
    • Installation of a new fire hyrdrant continues.

North Beach: Construction crews continue to remove the remaining tunnel boring machine (TBM) and restore the site.

  • 1731-1741 Powell:
    • Removal of TBM continues.
  • On Columbus Avenue between Union and Filbert:
    • Installation of street lighting and sewer cleaning scheduled to start Sept. 24.

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.

12 September 2014 ~ 0 Comments

Project Advancements | September 13 – September 22, 2014

A worker removes concrete to expose structural steel at the launchbox site near 4th and Harrison streets.

A worker removes concrete to expose structural steel at the launchbox site near 4th and Harrison streets.

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.

Schedules may change, and 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 Bryant to King streets.

  • On 4th Street between Bryant and Brannan:
    • At Bryant Street, excavation of an AT&T vault and installation of a sewer continues.
      • Muni service impact: 47 Van Ness Line bus stop temporarily relocated to mid-block.
    • At Freelon Street, excavation of a sewer man-hole continues. Freelon Street is closed to through traffic until late September.
  • On 4th Street between Brannan and King:
    • Sewer line cleaning continues.
    • At Bluxome Street, installation of an AT&T vault continues.

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

  • On 4th Street between Howard and Folsom:
    • Traffic reduced to one traffic lane starting Sept. 14.
    • At Clementina Street, closure to through traffic.
    • At Folsom Street, replacement of water line continues.

Union SquareConstruction crews are excavating the site, building station walls and relocating utilities along Stockton Street between Ellis and Post streets.

  • On Stockton Street between Ellis and Post:
    • Ellis Street to Geary Boulevard, closure to vehicular traffic.
    • At O’Farrell Street, reduction to one traffic lane.
      • Sidewalk closure scheduled overnight 10 p.m. to 6 a.m. for the next few weeks.
    • At Geary Boulevard, reduction to one traffic lane.
      • Starting Sept. 13 the crosswalk on the north side of Geary Boulevard will open. The crosswalk on the south side of Geary Boulevard will temporarily close.
      • Muni service impact: Bus stop at Geary Boulevard and Stockton Street temporarily discontinued until early October. Board bus on Geary Boulevard at Powell Street.
  • On Ellis Street between Stockton and Powell:
    • Ellis Street is temporarily closed to westbound traffic.

Chinatown: Construction crews are building station walls and installing new utilities at 933-949 Stockton Street between Clay and Washington streets.

  • On Washington Street between Stockton and Trenton:
    • Street is closed to through traffic.
  • On Washington Street between Stockton and Spofford:
    • Replacement of water pipeline continues.
    • Installation of a new fire hyrdrant continues.

North BeachConstruction crews are removing the final tunnel boring machine (TBM) and restoring the site.

  • 1731-1741 Powell:
    • Removal of TBM continues.
  • On Columbus Avenue between Union and Filbert:
    • Installation of new street lights and landscaping by Sustainable Streets continues.

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.

05 September 2014 ~ 0 Comments

Project Advancements | September 6 – September 15, 2014

On Stockton Street near Ellis Street, the future Union Square/Market Street station is being constructed.

On Stockton Street near Ellis Street, the future Union Square/Market Street station is being constructed.

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 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. 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)Excavation of a sewer man-hole continues on Freelon and 4th Street. Excavation of an AT&T vault to start on 4th and Bryant. Near Bluxome Street, installation of an AT&T vault to start. On Bryant Street, west of 4th Street, sewer installation to start next week. 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 are reduced to one traffic lane until 5 a.m., Monday, September 8. Starting Monday, September 15, traffic lanes on 4th Street between Howard and Folsom will be reduced to one lane until early November.

Union SquareStockton 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.

Pile installation takes place at the southwest intersection of Stockton and O’Farrell streets until late September. One lane of travel will be open. Sidewalk closure is to take place overnight between 10 p.m. and 6 a.m. on the northeast corner of Stockton at O’Farrell for next three weeks. Expect delays and use alternative routes.

Muni service impact:
The bus stop at Geary and Stockton will be temporarily discontinued until late September. Please board bus on Geary at Powell. Check back on the 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 at Stockton and Washington streets and the adjacent section of Washington Street. Work to replace the water pipeline and install a new fire hydrant on Washington is ongoing.

North Beach: Work continues at 1731-1741 Powell. Street restoration has been completed on Columbus Avenue between Filbert and Union. Sustainable Streets is scheduled to install new street lights and landscaping in the median on this portion of Columbus Avenue. This work will be completed by the end of 2014.

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.

29 August 2014 ~ 0 Comments

Project Advancements | August 30 – September 8, 2014

Near the intersection of Stockton Street at Washington Street, the walls for the future Chinatown Station are being constructed.

Near the intersection of Stockton Street at Washington Street, the walls for the future Chinatown Station are being constructed.

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 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. 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 Townsend Street between 4th and 5th streets, work on utilities continues. On Freelon Street near the east side of 4th Street, excavation of a sewer man-hole continues. On the east side of 4th Street near Bryant Street, excavation of an AT&T vault to start. 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 two traffic lanes available for travel.

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.

Pile installation takes place at the southwest intersection of Stockton and O’Farrell streets until late September. 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 early September. Please board bus on Geary at Powell. Please check back on the 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 at Stockton and Washington streets and the adjacent section of Washington Street. Work to replace the water pipeline and install a new fire hydrant on Washington is ongoing.

North Beach: Work continues at 1731-1741 Powell. Street restoration has been completed on Columbus Avenue between Filbert and Union. Sustainable Streets is scheduled to install new street lights and landscaping in the median on this portion of Columbus Avenue. This work will be completed by the end of 2014.

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.

 

28 August 2014 ~ 4 Comments

Dismantling Big Alma

TBM Big Alma

After breaking through on June 11, the 750-ton tunnel boring machine (TBM) Big Alma was removed from the retrieval shaft in North Beach. TBM Mom Chung is currently in the process of being disassembled.
Pictured clockwise from left to right. Pieces of Big Alma: cutter head, cutters, bolts, and brackets.

Pictured clockwise from left to right. Pieces of Big Alma: cutterhead, cutters, bolts, and brackets.

Pictured clockwise from left to right: Construction crew hoisting out one of the dual motors, using cutting torches to section the shield, and leveraging against the screw auger of the TBM.

Pictured clockwise from left to right: Construction crew hoisting out one of the dual motors, using cutting torches to section the shield, and leveraging against the screw auger of the TBM.

To retrieve each TBM, the machines are cleared of debris, cut into sections, brackets re-wielded for attachment points, pieces hoisted out, and parts are loaded on trucks for off-hauling.
Northbound tunnel sits empty after TBM Big Alma was removed.

On the left, the Northbound tunnel sits empty after TBM Big Alma’s removal. On the right, TBM Mom Chung continues to be disassembled.

More information about the construction of the tunnels can be found here. In addition, more photos and videos can be accessed on our Flickr and YouTube pages.