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Central Subway Construction Update 4/10/15

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Central Subway
Project Advancements

April 11 - April 20, 2015


This section contains brief updates about recent construction activities and a look-ahead for what to expect in Southern SoMa, Northern SoMa, Union Square, Chinatown and North Beach over the next two weeks. For more detailed information, scroll down or click 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 traffic and pedestrian notifications posted at the work sites.

Southern SoMa (Harrison to King): Utility work continues along 4th Street from Bryant to King streets.

  • Portal construction
    • Expected to be complete and all traffic lanes reopened by the end of next week.
    • Contractor will continue to work at the portal location until mid-May.

Northern SoMa (Market to Harrison): Excavation and construction of station roof along 4th Street between Howard and Folsom streets are underway. Ongoing utility restoration activity at 4th and Jessie streets.

Union Square: Excavation of the station, relocation and supporting of utilities on Stockton Street between Ellis and Post streets are ongoing.

Chinatown: Excavation of the site and installation of the station roof are in progress.

  • On Stockton Street between Sacramento and Jackson streets
    • Instrumentation installation to start April 17 with night work hours of Monday to Friday, 9 p.m. to 5 a.m.
      • Parking may be limited in the work location during work hours
    • Potholing continues
      • Parking will be unavailable during work hours Monday to Friday, 7 a.m. to 5 p.m.
  • Muni Service Impact:
    • A bus stop for southbound 8X/8AX/8BX Bayshore Express, 30 Stockton, 45 Union/Stockton and 91 Owl on Stockton Street between Washington and Jackson streets is relocated
    • New bus stop location is on Stockton Street at Jackson Street

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.

The Central Subway Team After excavating the<br /> roadway on 4th Street, shoring has been installed to stabilize the ground around a sewer line.After excavating the roadway on 4th Street, shoring has been installed to stabilize the ground around a sewer line. Southern SoMa

4th Street from Harrison Street to King Street


On 4th Street between Harrison and Bryant streets, the contractor is on the verge of completion of the portal structure. The portal is where the Central Subway cars will enter/exit the roadway from the tunnels below. All traffic lanes are anticipated to reopen next week. The contractor will continue with minor work in this location until mid-May.

Ongoing construction (Harrison to Bryant):

  • Paving of roadway
  • Sidewalk restoration
  • Portal construction

Traffic and pedestrian impacts (Harrison to Bryant):

  • Reconfigured traffic lanes to accomodate repaving activities
  • Currently one lane of traffic is open on 4th Street between Harrison and Bryant streets
  • At the intersection of 4th and Bryant:
    • The left lane on the I-80 freeway off-ramp may be closed during paving activities
  • At the intersection of 4th and Harrison streets:
    • Two traffic lanes will remain open on Harrison Street, Monday to Friday, 7 a.m. to 3 p.m.
    • Access to I-80 freeway may be limited on some evenings from 8 p.m. to 5 a.m. and during weekends
    • Parking may be impacted in the vicinity of the construction area
  • Sidewalk access on the east side of the block may be limited, signage to direct pedestrians will be posted
  • The sidewalk on the west side of the block will remain closed

On 4th Street between Bryant and King streets, relocation and installation of utilities continues.

Ongoing construction (Bryant to King):

  • Sewer work on 4th Street between Brannan and King streets
  • Utility work on 4th Street between Brannan and Bluxome streets
  • Sidewalk restoration work at 4th and Bryant streets
  • Work hours are Monday-Friday, 7 a.m. to 4 p.m.
  • Work may involve saw-cutting, potholing and jack-hammering in the roadway and sidewalk

Traffic and pedestrian impacts (Bryant to King):

  • Muni Service Impact:
    • The bus stop for the 47 Van Ness and 83X Mid-Market Express on 4th Street at Townsend Street has been relocated to Townsend Street between 4th and 5th streets
  • Outer lanes on 4th Street between Bryant and King streets are available for traffic
  • Sidewalk access may be limited
  • The contractor will maintain a safe path of travel as well as access to businesses during business hours

The crew install rebar and concrete forms on 4th Street at Clementina Street in preparation for a concrete pour<br /> for the future Yerba Buena/Moscone Station.
The crew install rebar and concrete forms on 4th Street at Clementina Street in preparation for a concrete pour for the future Yerba Buena/Moscone Station.
Northern SoMa

4th Street from Market Street to Harrison Street

On 4th Street between Howard and Folsom streets, work to construct the Yerba Buena/Moscone Station continues. Excavation of the site is ongoing.

Ongoing construction (Howard to Folsom):

  • Utility work on Folsom Street at 4th Street
    • Night work hours of 9 p.m. to 5 a.m.
  • Excavation of the site
  • Installation of the roof slab

Traffic and pedestrian impacts (Howard to Folsom):

  • Two lanes of traffic on 4th Street are open
  • Two right lanes on Folsom Street available during utility work
  • Street closure of Clementina Street at 4th Street
  • The sidewalk on the west side is closed

On 4th Street between Market and Mission streets, utility restoration activities continue. This work will occur seven days a week.

Ongoing construction (Market to Mission):

  • Replacement of utility lines
    • Work hours: 7 a.m. to 11 p.m.
    • Work may be required outside work hours to facilitate utility connections

Traffic and pedestrian impacts (Market to Mission):

  • Two traffic lanes will remain open on the east side
  • Parking is impacted in the vicinity of the construction zone

Workers install shoring to reinforce the excavated area at Stockton and Ellis streets.
Workers install shoring to reinforce the excavated area at Stockton and Ellis streets. Union Square

Stockton Street from Ellis Street to Post Street


On Stockton Street between Ellis and Post streets, the contractor is excavating and installing the roof slab for the Union Square/Market Street Station. Portions of Union Square Garage will be demolished.

Ongoing construction (Ellis to Post):

  • Installation of roof deck
  • Utility relocation and support
  • Excavation
  • Compensation and jet grouting
  • Construction hours may be 24 hours a day, Monday to Saturday, Sunday work may be required

Traffic, transit and pedestrian impacts (Ellis to Post):

  • Stockton Street between Ellis and Post streets is closed to vehicular traffic
    • Local deliveries may access Maiden Lane from Post Street
    • Sidewalk access may be limited at times
  • Muni service impact:
    • The bus stop for the 38 Geary Route on Geary Boulevard at Stockton Street is discontinued until further notice
    • Board bus on Geary Boulevard at Powell Street

Ongoing construction (Ellis Street):

  • Relocation of utilities
  • Excavation
  • Demolition of BART annex
  • Installation of roof deck beams

Traffic, transit and pedestrian impacts (Ellis Street):

  • Ellis Street is closed to through traffic between Stockton and mid-block until the end of May
  • Sidewalk access in the area may be limited at times

Workers install rebar<br /> at the future Chinatown Station.Workers install rebar at the future Chinatown Station. Chinatown

Stockton Street from Sacramento Street to Jackson Street

At 933-949 Stockton Street, construction and excavation of Chinatown Station is underway.
Ongoing construction (Sacramento to Jackson):

  • Instrumentation installation to start April 17
    • Night work hours: Monday to Friday, 9 p.m. to 5 a.m.
  • Potholing continues along Stockton Street
    • Work hours: Monday to Friday, 7 a.m. to 5 p.m.
  • Monitoring equipment installation on sidewalks along both sides of Stockton Street
    • Work hours: Monday to Friday, 7 a.m. to 4 p.m.
  • Waterproofing and installation of the station roof
  • Excavation of station site
    • Construction hours are Monday to Saturday, 7 a.m. to 7 p.m.

Traffic, transit and pedestrian impacts (Sacramento to Jackson):

  • Parking Impact:
    • May be limited during the instrumentation installation
    • Will be unavailable during potholing work Monday to Friday, 7 a.m. to 5 p.m
  • Muni Service Impact:
    • A bus stop for southbound 8X/8AX/8BX Bayshore Express, 30 Stockton, 45 Union/Stockton and 91 Owl on Stockton Street between Washington and Jackson streets is relocated
    • New bus stop location is on Stockton Street at Jackson Street
  • Sidewalks along Stockton to remain open
  • Washington Street:
    • Remains closed between Stockton and Trenton streets
    • Is converted into a two-way street between Powell Street and the construction zone

Connecting People. Connecting Communities.


Muni Service Impacts: A bus stop for southbound 8X/8AX/8BX Bayshore Express, 30 Stockton, 45 Union/Stockton and 91 Owl on Stockton Street between Washington and Jackson streets is relocated to Stockton Street at Jackson Street.

The bus stop for the 47 Van Ness and 83X Mid-Market Express on 4th Street at Townsend Street is relocated to Townsend Street between 4th and 5th streets.

The bus stop for the 38 Geary Route on Geary Boulevard at Stockton Street is discontinued until further notice. Board bus on Geary Boulevard at Powell Street.

Contact Us: If you have questions about construction or the Central Subway Project you can email us at central.subway@sfmta.com or call us at 415-701-4371.

For More Information: The Central Subway team posts frequent project updates on a variety of social media outlets. To find out more about the project and construction progress, follow us on Facebook, Twitter, Instagram or Flickr, and check out our blog.

Construction schedules are subject to change.