11 June 2012 ~ 3 Comments

Starting in SoMa: On 4th Street between Folsom and Howard, construction to prepare for tunneling

Construction on 4th at Folsom, June 2012

Construction is now underway on 4th Street near the intersection with Folsom Street.

Construction to prepare for the installation of below-ground walls, called headwalls, has begun on 4th Street between Folsom and Howard streets, the site of the future Yerba Buena/Moscone Station. The work currently underway includes potholing and utility relocation. Headwall installation, which involves major excavation work and will require the use of heavy machinery, will soon follow.

The headwalls will be constructed across 4th Street and reach a depth of about 100 feet. Permanent components of the Central Subway, the headwalls will be integrated into the subway station that will be constructed at this location.

Headwall outline - 4th and Folsom

White spray paint outlines the location on 4th Street just north of Folsom Street where headwalls will be installed.

Headwall construction is expected to last through spring 2013. While construction is in progress, those traveling, working and living in the area can expect to see large construction equipment as well as an increase in noise, dust and truck traffic while work is in progress. The Central Subway team will continue to work closely with communities, local businesses and organizations to inform them of construction impacts and to ensure appropriate mitigation measures are in place.

To mitigate construction impacts, dust and noise levels will be monitored and kept within permitted levels, and the contractor will perform street sweeping daily to clean the construction site and surrounding areas.

Access to local businesses, residences and driveways will be maintained.

Transit, Traffic and Pedestrian Impacts

The following describes ongoing and upcoming traffic and transit impacts at the headwall installation site on 4th Street between Folsom and Howard streets:

  • The 8X/8AX/8BX Bayshore Express and 91 Owl will be rerouted in July, and the temporary 8 Shuttle route will be eliminated. Additional information will be available soon online and in media alerts.
  • At least two lanes on 4th Street will remain open to traffic while work is in progress.
  • Sidewalks on the west side of the block will be impacted.
  • Access to Clementina Street between 4th and 5th streets may be restricted at times, but the contractor will facilitate access for deliveries.
  • Parking restrictions will be in effect in and around the construction area.
  • Electronic messaging boards will be in place and parking control officers and flaggers will monitor and facilitate the flow of traffic as appropriate.

Find Out More

As work proceeds, additional information on local impacts will be made available here, on Facebook, on Twitter, on our project Google Map and in media alerts. To schedule a briefing on tunnel-related construction for your community group or organization, please contact Brajah Norris at 415-701-5263 or email our team at central.subway@sfmta.com.

More information about the Central Subway tunnel and the tunnel-related work slated for 2012 is available in the following documents:

We appreciate your continued patience while construction is in progress.

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3 Responses to “Starting in SoMa: On 4th Street between Folsom and Howard, construction to prepare for tunneling”

  1. Nation Wide Industrial Supply 1 June 2013 at 7:55 am Permalink

    Thanks for sharing this information with us, will be really helpful for citizens, they are doing a nice thing by not disturbing the driveways and local businesses.

  2. Maurita Jacko 5 September 2017 at 3:47 am Permalink

    Appreciating the hard work you put into your blog and in depth information you offer. It’s good to come across a blog every once in a while that isn’t the same unwanted rehashed material. Fantastic read! I’ve bookmarked your site and I’m adding your RSS feeds to my Google account.


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