Central Subway Construction Update – December 13, 2013

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The Central Subway will extend the Muni Metro T Third Line underground through some of San Francisco’s busiest and fastest growing neighborhoods. This significant improvement to public transit is scheduled to open in 2019. Thank you for your patience and interest as we build it.

Underground on 4th Street, two tunnels are now in construction. Here we see the entrances to both, beneath 4th and Harrison.

Underground on 4th Street, two tunnels are now in construction. Here we see the entrances to both, beneath 4th and Harrison.

Construction Update

December 14-23, 2013

During the next 10 days, Central Subway work will continue 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, scroll down or click on the links below. We also post construction, traffic detour and Muni impact information on our project Google Map.

Southern SoMa (Harrison to King/Berry): We now expect to begin potholing for utilities on 4th Street between Bryant and King in January. At the tunnel launch box on 4th Street between Harrison and Bryant, tunneling continues with both TBMs.

Northern SoMa (Market to Harrison): Next week the contractor will begin restoring the work zone on 4th Street between Folsom and Harrison. The traffic pattern may change to allow for underground sewer surveys, with construction in progress in the intersection of 4th and Harrison and, tentatively, 4th and Folsom. At 4th and Folsom, work to prepare for the Yerba Buena/Moscone Station continues. Work includes demolishing the roadway within the construction zone to prepare to construct underground station walls. This work will be noisy.

Union Square: Construction is now paused on Stockton Street, resuming in January. Work will continue on Ellis Street during December to allow for ground improvements related to tunneling.

Chinatown: Work to prepare for the Chinatown Station continues within the future station site and on the adjacent section of Washington Street. On Clay and Jackson streets adjacent to Stockton Street, the contractor may be performing underground borings some nights next week.

North Beach: Construction is now paused on Columbus Avenue, resuming in January. Work will continue on private property at 1455 Stockton and 1731-1741 Powell to ensure we are ready for the arrival of the first TBM in the spring.

We appreciate your patience and support while we build this essential upgrade to San Francisco’s public transportation system.

-The Central Subway Team

At 1731-1741 Powell, we are constructing a retrieval shaft to remove two tunnel boring machines from the ground when tunneling is finished.

At 1731-1741 Powell, we are constructing a retrieval shaft to remove two tunnel boring machines from the ground when tunneling is finished.

North Beach

Powell Street from Union to Columbus

On private property at 1731-1741 Powell Street, the contractor is building a walled excavation known as a retrieval shaft at the site where tunneling will end. The two tunnel boring machines will be removed from the ground here. We plan to complete work at this location in 2014.

Near the intersection of Columbus Avenue and Union Street, construction is currently paused. The contractor will complete utility work next year. More information is available in this flier.

On private property at 1455 Stockton Street, the contractor is constructing an underground shaft to perform ground improvements when the TBMs pass below Columbus Avenue.

Planned construction (Pagoda):

  • Install pipes underground for ground improvements
  • Construct retrieval shaft (subsurface walls)
  • Planned construction hours are Monday to Saturday, 6 a.m. to 11 p.m.

Traffic, transit and pedestrian impacts (Pagoda):

  • Several parking spaces may be closed in front of the property.
  • The sidewalk in front of the property may be closed. A temporary walkway will be in place around the construction zone when the sidewalk is closed.

Planned construction (Columbus and Union):

  • No construction planned

Traffic, transit and pedestrian impacts (Columbus and Union):

  • None

Planned construction (1455 Stockton):

  • Install ground improvement components from within ground improvement shaft
  • Planned work hours are Monday-Friday, 7 a.m. to 3:30 p.m.

Traffic, transit and pedestrian impacts (1455 Stockton):

  • No impacts to traffic, transit or pedestrian walkways are anticipated
  • The parking lot at 1455 Stockton will remain closed