Hi! Welcome...

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.

03 January 2014 ~ 1 Comment

Construction Update | January 4-13, 2014

131219_1009_Pagoda

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

Next week traffic modifications on Stockton between Geary and Ellis streets near Union Square will recommence to accommodate construction of the Central Subway Union Square/Market Street station.

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 expect to begin potholing for utilities on 4th Street between Bryant and King in mid-January. At the tunnel launch box on 4th Street between Harrison and Bryant, tunneling continues with both TBMs.

Northern SoMa (Market to Harrison): We plan to begin restoring 4th Street between Folsom and Harrison during the next two weeks. Until then, the traffic pattern may change to allow for underground sewer surveys. At 4th and Folsom, work to prepare for the Yerba Buena/Moscone Station continues. Work may include demolishing the roadway within the construction zone to prepare to construct underground station walls.

Union Square: Next week, Stockton Street between Ellis and Geary will be closed to vehicular traffic to allow for construction of the Union Square/Market Street Station. The construction zone on Ellis Street will remain in place.

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

North Beach: Work on Columbus Avenue at Union Street may resume next week. Work will continue at 1455 Stockton and 1731-1741 Powell, within the property lines.

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

-The Central Subway Team

 

20 December 2013 ~ 0 Comments

Construction Update | Dec. 21-Jan. 6

131219_1025_GreenShaft

In a parking lot at Stockton and Green, crews have built this underground shaft. From it, we will improve and stabilize ground conditions beneath Columbus Avenue during tunneling.


Due to the upcoming holidays, this update covers the next two weeks of Central Subway work. There will be no update next Friday, Dec. 27. Happy holidays from the Central Subway team!


During the next 17 days, Central Subway work will continue 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. We also post construction, traffic detour and Muni impact information on our project Google Map.

In honor of Christmas and New Year’s Day, no construction will take place on Dec. 25 or Jan. 1. Starting in the new year, work will recommence on Columbus Avenue in North Beach and on Stockton Street in Union Square.

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): We plan to begin restoring 4th Street between Folsom and Harrison during the next two weeks. Until then, the traffic pattern may change to allow for underground sewer surveys. At 4th and Folsom, work to prepare for the Yerba Buena/Moscone Station continues. Work may include demolishing the roadway within the construction zone to prepare to construct underground station walls.

Union Square: Construction is now paused on Stockton Street, resuming in January. Stockton Street between Ellis and Geary is tentatively planned to close to vehicle traffic on Thursday, Jan. 2, to allow for construction of the Union Square/Market Street Station. The construction zone on Ellis Street will remain in place.

Chinatown: Work to prepare for the Chinatown Station continues within the future station site and on the adjacent section of Washington Street.

North Beach: On Columbus Avenue at Union Street, construction is planned to resume Thursday, Jan. 2. Work will continue at 1455 Stockton and 1731-1741 Powell, within the property lines. No construction is planned at 1731-1741 Powell from Christmas to New Year’s Day.

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

13 December 2013 ~ 0 Comments

Construction Update | Dec. 14-23

131210_1067_LaunchBox

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

During the next 10 days, Central Subway work will continue 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. 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.

06 December 2013 ~ 0 Comments

Construction Update | December 7-16

131204_1121_SB_Tunnel

Inside TBM Mom Chung, the new tunnel curves as it passes below Market Street. Our tunneling crews successfully and safely completed the crossing under BART last week.

We completed an important construction milestone last week as our tunneling contractor and TBM Mom Chung successfully and safely tunneled under Market Street and the existing BART and Muni tunnels. The TBM is now under Stockton Street in Union Square.

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

Southern SoMa (Harrison to King/Berry): We expect to begin potholing for utilities on 4th Street between Bryant and King the week of Dec. 16. At the tunnel launch box on 4th Street between Harrison and Bryant, tunneling continues with both TBMs.

Northern SoMa (Market to Harrison): We have reestablished our work zone on 4th Street between Folsom and Harrison, in front of Pacific Bicycle. Work here involves improving ground conditions as the second TBM, Big Alma, passes underground. Work is currently paused at 4th and Stevenson, to resume when Big Alma reaches that area. At 4th and Folsom, we are building a covered walkway adjacent to the construction site on 4th Street and Clementina.

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: Last week our crews closed a portion of Washington Street just west of Stockton Street to allow for utility work and the construction of underground Chinatown Station walls. Tentative: 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. One morning next week, heavy equipment will be delivered to the construction site at the 1455 Stockton parking lot early in the morning, before regular working hours.

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

04 December 2013 ~ 6 Comments

Time-lapse video: The first months of tunneling with TBM Mom Chung

Using time-lapse cameras installed underground, we’ve condensed the first months of tunneling into this captivating two-minute video. In the video, Central Subway crews assemble tunnel boring machine (TBM) Mom Chung and drive the state-of-the-art tunnel builder north under 4th Street to build San Francisco’s first new subway line in decades. The video shows the TBM assembly process, installation of the first tunnel rings, removal of excavated ground spoils and other aspects of the complex tunneling operation.

By the end of the video, Mom Chung has tunneled from her launch box south of 4th and Harrison to 4th between Folsom and Howard. Since we captured this footage, she has mined much farther north, crossing successfully and safely under Market Street and the existing BART and Muni tunnels last weekend.

We thank our tunneling crews and tunneling contractor Barnard Impregilo Healy for their hard work to build the Central Subway, extending the Muni Metro T Third Line through SoMa, Union Square and Chinatown. Stay tuned for more time-lapse videos as construction proceeds.

25 November 2013 ~ 0 Comments

TBM Big Alma Launches, Commencing Construction of Second Central Subway Tunnel

131106_1069_LaunchBox

Tunnel boring machine Big Alma, shown here on the right, began tunneling under 4th Street. On the left is the entrance to the parallel tunnel being built by TBM Mom Chung.

There are now two 350-foot-long, 750-ton tunnel boring machines mining under 4th Street to construct the Central Subway’s pair of parallel tunnels. Our second TBM, named Big Alma, recently launched. She’s building the tunnel that northbound T Third Line trains will use when the Central Subway opens in 2019.

Over the coming months, Big Alma will travel north under 4th Street and Stockton Street, building tunnel at an average pace of 40 feet per day. Her tunnel will be just east of the tunnel that her twin, named Mom Chung, began building in July. Big Alma will move more slowly during the first 500 feet of tunneling, as Central Subway crews test the TBM and calibrate its many functions.

Big Alma is named for “Big Alma” de Bretteville Spreckels, a 19th century socialite and philanthropist who, among her many accomplishments, persuaded her first husband, sugar magnate Adolph B. Spreckels, to fund the design and construction of the California Palace of the Legion of Honor, at Land’s End in San Francisco. A model in her youth, Spreckels was the inspiration for the “Victory” statue atop the Dewey Monument in the center of Union Square.

The photos below show Big Alma the TBM during her assembly and launch. To learn more about Big Alma and her underground journey to build San Francisco’s first new subway line in decades, check out this press release from the SFMTA. You can also follow the machine on Twitter. She’s @BigAlmatheTBM.

130717_1119_launchbox

This section of Big Alma’s “shield,” the portion of the machine that puts in place the tunnel segments, was among the first to be lowered into the launch box.

130718_1179_bigalmacutterhead

Known as the “cutter head,” this part is on the front of the machine, attached to the shield. It excavates the earth to make room for the new tunnel.

130718_1206_bigalmacutterhead

The cutter head is lifted by a crane and lowered into the launch box.

130718_1245_bigalmacutterhead

Underground, crews connect the cutter head to the shield.

130723_1210_launchbox

A welder welds together two sections of Big Alma’s shield.

130905_1070_LaunchBox

After the shield and cutter head were assembled, crews moved them to the northern end of the launch box, where tunneling begins.

130905_1081_LaunchBox

Crews work in the launch box, preparing to move Big Alma forward.

130911_1042_LaunchBox

In the launch box, Mom Chung is on the left, tunneling, and Big Alma is on the right, being assembled.

130925_1071_LaunchBox

Crews assemble the trailing gear of Big Alma. This 300-foot train of tunnel-building mechanisms performs a variety of important functions.

130925_1099_LaunchBox

Once assembled, the trailing gear stretches almost the full length of the launch box.

131009_1062_LaunchBox

A welder works on Big Alma’s shield in the weeks before launch.

131029_1019_LaunchBox

Tunnel segments are lowered into the launch box for installation by the TBMs.

131113_1040_LaunchBox

After Big Alma’s launch, a tunneling crewman walks out the back of the machine. We thank our crews for their hard work as they build San Francisco a new subway line.

22 November 2013 ~ 0 Comments

Construction Update | November 23-December 9

Due to the Thanksgiving holiday, this update covers the next two weeks. Our next update will be on Friday, Dec. 6. Happy Thanksgiving from the Central Subway team!

131121_1018_801Market

Near Union Square, Stockton Street part of Stockton Street is now reopened. In this shot, crews finish the paving and traffic striping.

During the next 17 days, tunneling and tunneling preparatory work will continue in SoMa, Union Square and North Beach. Work to prepare for station construction is continuing in Chinatown and northern SoMa. In southern SoMa, preparatory construction is planned to start in December.

Next week, our first tunnel boring machine will cross under Market Street and the existing BART and Muni Metro tunnels. For more information on this major milestone, check out our blog.

This section provides overviews of current and upcoming construction impacts in each neighborhood. For full descriptions, click here or 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):

  • New: The start date of utility potholing has been pushed back. This work is now planned to begin the week of Dec. 2 on 4th Street between Bryant and King. Potholing involves drilling holes and trenches in the street to confirm the locations of existing utility lines. Work hours will usually be Monday to Friday, 7 a.m. to 5 p.m. More details are in the Southern SoMa section and in this construction notice.
  • Continuing: 4th Street between Harrison and Bryant may fully close some evenings and weekends. A closure is planned for tonight, starting at 8 p.m. This closure may continue through the weekend. Two lanes of traffic will remain open at all other times. On Bryant Street at 5th Street, the left lane and several parking spaces will remain closed.
  • Upcoming: Starting in 2014, additional construction will begin on 4th Street south of Bryant. Work includes relocation of several utility lines, construction of light-rail tracks and construction of an above-ground train station at 4th and Brannan. Impacts will vary during different phases of construction and on different blocks.

Northern SoMa (Market to Harrison)

  • New: Tentative: Perform sewer surveys on Folsom near the intersection with 4th Street.
  • Continuing: 4th Street between Market and Stevenson will be reduced to two traffic lanes so we can improve the ground as the tunnel boring machines pass below. The work zone is on the east side of the street, in front of Ross. A temporary taxi stand is in place just south of Stevenson.

    The two right lanes will remain closed on 4th Street between Howard and Folsom. South of Clementina, the sidewalk on the west side of the street is closed. To ensure safety, pedestrians should use the sidewalk on the other side of the street and cross the street at 4th and Howard.

    On 4th Street between Folsom and Harrison, the parking lane and one lane of traffic on the east side of the street will remain closed to allow for ground improvement work.

  • Upcoming: After completing preparatory work, we will begin building the Yerba Buena/Moscone Station in the coming months at 4th and Folsom.

Union Square

  • New: Stockton Street between Ellis and O’Farrell is now open to vehicle traffic. Stockton between O’Farrell and Geary is planned to reopen early next week. The blocks will remain open until January 2014.
  • Continuing: Ellis Street between Stockton and Powell will remain closed to westbound traffic. At this location, we will improve ground conditions as the TBMs pass below.
  • Upcoming: Construction of the Union Square/Market Street Station is starting next year. We will provide more information soon.

Chinatown:

  • New:  Washington Street between Stockton and Trenton may close to vehicles and pedestrians the week of Nov. 25. This closure will allow us to relocate utilities and build an underground station wall in this area. The closure is expected to last for approximately two years.
  • Continuing: The contractor continues performing utility work at and around Stockton and Washington. Expect parking impacts around construction zones.
  • Upcoming: Within the Chinatown Station site, we are performing archeological surveys and environmental assessments in preparation for station construction next year.

North Beach:

  • New: Utility construction will pause at and around the intersection of Columbus and Union from Thanksgiving to New Year’s Day. Next week, utility construction will be underway from Monday to Wednesday (11/25-27).
  • Continuing: At the Pagoda, parking and walkways may be impacted in front of the Pagoda Palace property. We plan to complete work at this location in 2014.

    In the Bank of America parking lot at 1455 Stockton, crews are constructing a shaft 20 feet in diameter and 27 feet deep, for use to improve ground conditions when the TBMs pass beneath Columbus Avenue. The parking lot will be closed but the banking drive-thru will remain open. Work hours are Monday to Friday, 7 a.m. to 3:30 p.m.

  • Upcoming: To ensure we are prepared for the arrival of the TBMs next year, work will continue during December on private property within 1731-1741 Powell Street and the parking lot of 1455 Stockton Street.

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

21 November 2013 ~ 0 Comments

First Central Subway tunnel boring machine to pass under existing BART, Muni Metro tunnels next week

130814_1090_TBMMomChung

In the operating cabin of TBM Mom Chung, two TBM operators monitor tunneling conditions provided from a variety of state-of-the-art instruments.

Next week our first tunnel boring machine, Mom Chung, will pass beneath Market Street and the existing BART and Muni Metro tunnels, crossing from SoMa and into Union Square. The tunnel, one of two being constructed as part of the Central Subway Project, will allow T Third Line trains to travel quickly beneath 4th Street and Stockton Street when the Central Subway opens, cutting travel times by more than half along this busy corridor.

The SFMTA has worked in close coordination with BART and an independent panel of top tunneling experts to plan and carry out this key phase of tunnel construction. To pass beneath Market Street and the existing transit tunnels, TBM Mom Chung will turn slightly left beneath 4th Street just south of Market Street and travel partially under 801 Market Street, home to Old Navy. The machine will then veer right to head north under Market Street and then Stockton Street. The new T Third Line tunnels will be about 10 feet below the existing BART tunnels.

market_crossing_scurve-01

This graphic shows the path the Central Subway TBMs will take when they pass under Market Street. The first TBM, Mom Chung, is expected to begin this crossing on Monday.

Starting yesterday, Mom Chung is in operation 24 hours a day to build the approximately 425 feet of new tunnel beneath Old Navy and the Market Street tunnels. Mom Chung is expected to begin crossing beneath the Market Street tunnels on Monday, Nov. 25. The tunneling methods used during this key crossing will be the same that are in use along the rest of the tunneling route. As the TBM moves forward, it installs tunnel segments within the section known as the “shield,” a 20-foot-diameter cylinder at the front of the machine. The shield and the newly installed tunnel lining create a watertight barrier that holds the ground outside in place. Using these methods, tunneling contractor Barnard Impregilo Healy (BIH) has constructed more than 2,100 feet of tunnel under 4th Street so far.

“We’re thrilled at the progress our tunneling contractor and tunnel boring machines are making to build this essential new subway line for San Francisco,” said SFMTA Director of Transportation Edward D. Reiskin. “We are using state-of-the-art technology and the country’s top expertise to ensure the entire tunneling process safeguards the city as well as the region’s critically important transportation infrastructure. We thank BART for the excellent partnership in this process.”

tunnel

With the help of TBM Mom Chung, Central Subway crews have now built a new subway tunnel under 4th Street from Harrison and Stevenson.

131120_1074_launchboxUnderground, two Central Subway tunnels are now under construction. The tunnel on the left will pass beneath BART and Market Street in the coming days.

In preparation for the crossing, the contractor has injected a ground-stabilizing grout underground near the BART tunnels, accessing this subterranean area via a deep shaft they constructed on Ellis Street. They will inject additional grout as needed while Mom Chung is mining below BART.

About 150 monitoring devices installed in the Powell Street Station and on neighboring buildings will provide live data feeds about tunneling conditions to web applications that the SFMTA, the contractor, BART and an independent panel of tunneling experts can view at all times. Similar devices are installed along the entire tunneling path, from 4th and Bryant in SoMa to Columbus and Powell in North Beach. The readings of these instruments and others on the TBM itself allow the tunneling contractor to respond rapidly to ground conditions around the machine as it moves forward.

BART may run at lower speeds between Powell and Montgomery stations while tunneling is in progress under BART. Please visit BART on the web at www.bart.gov/alerts or call 511 to get up-to-date service information.

For more about this major tunneling milestone, check out this press release from the SFMTA.

15 November 2013 ~ 1 Comment

Construction Update | Nov. 16-25

131113_1074_SB_Tunnel

In the new tunnel, two crewmen watch as a cart approaches, carrying with it tunnel segments for TBM Mom Chung to install.

During the next 10 days, tunneling and tunneling preparatory work will continue in SoMa, Union Square and North Beach. Work to prepare for station construction is continuing in Chinatown and northern SoMa. In southern SoMa, preparatory construction is planned to start next week.

This section provides overviews of current and upcoming construction impacts in each neighborhood. For full descriptions, click here or on the links below.

Southern SoMa (Harrison to King/Berry):

  • New: We plan to begin potholing for utilities next week on 4th Street between Bryant and King. This involves drilling holes and trenches in the street to confirm the locations of existing utility lines. Work hours will usually be Monday to Friday, 7 a.m. to 5 p.m. Next week, the potholing crews will be on the eastern side of the street and the eastern sidewalk. More details are in the Southern SoMa section and in this construction notice.
  • Continuing: 4th Street between Harrison and Bryant may fully close some evenings and weekends. Two lanes of traffic will remain open at all other times. On Bryant Street at 5th Street, the left lane and several parking spaces will remain closed.
  • Upcoming: Starting in 2014, additional construction will begin on 4th Street south of Bryant. Work includes relocation of several utility lines, construction of light-rail tracks and construction of an above-ground train station at 4th and Brannan. Impacts will vary during different phases of construction and on different blocks.

Northern SoMa (Market to Harrison)

  • New: Tentative: Perform sewer surveys on Folsom near the intersection with 4th Street.
  • Continuing: 4th Street between Market and Stevenson will be reduced to two traffic lanes so we can improve the ground as the tunnel boring machines pass below. The work zone is on the east side of the street, in front of Ross. A temporary taxi stand is in place just south of Stevenson.

    The two right lanes will remain closed on 4th Street between Howard and Folsom. South of Clementina, the sidewalk on the west side of the street is closed. To ensure safety, pedestrians should use the sidewalk on the other side of the street and cross the street at 4th and Howard.

    On 4th Street between Folsom and Harrison, the parking lane and one lane of traffic on the east side of the street will remain closed to allow for ground improvement work.

  • Upcoming: After completing preparatory work, we will begin building the Yerba Buena/Moscone Station in the coming months at 4th and Folsom.

Union Square

  • New: We have completed construction of underground walls on Stockton Street and will be restoring the roadway over the next weeks. We expect to reopen Stockton Street next Thursday, Nov. 21.
  • Continuing: Ellis Street between Stockton and Powell will remain closed to westbound traffic.
  • Upcoming: Construction of the Union Square/Market Street Station is starting next year. We will provide more information soon.

Chinatown:

  • New:  Washington Street between Stockton and Trenton may close to vehicles and pedestrians the week of Nov. 18. This closure will allow us to relocate utilities and build an underground station wall in this area. The closure is expected to last for approximately two years.

    On Stockton Street, the sidewalk in front of 933-949 Stockton is scheduled to reopen Monday, Nov. 18.

  • Continuing: Building demolition at 933-949 Stockton Street is now complete. The contractor continues performing utility work on Stockton at Washington, and on Stockton between Sacramento and Washington. Expect parking impacts around construction zones.
  • Upcoming: Within the Chinatown Station site, we are performing archeological surveys and environmental assessments in preparation for station construction next year.

North Beach:

  • New: On Saturday, November 16, construction will not take place within the Pagoda as previously planned. However, the contractor will be on site performing maintenance on their machine.

    Starting Monday, Nov. 18, construction hours at the Pagoda will be extended. Hours will usually be Monday to Saturday, 6 a.m. to 11 p.m. The longer hours are required to ensure this work is complete in time for the TBMs to arrive at the site.

  • Continuing: At the Pagoda, parking and walkways may be impacted in front of the Pagoda Palace property.

    Utility work will continue at and near the intersection of Columbus Ave and Union Street. This work will complete the utility relocation started last year. More details are included in the North Beach section and in this flier.

    In the Bank of America parking lot at 1455 Stockton, crews are constructing a shaft 20 feet in diameter and 27 feet deep, for use to improve ground conditions when the TBMs pass beneath Columbus Avenue. The parking lot will be closed but the banking drive-thru will remain open. Work hours are Monday to Friday, 7 a.m. to 3:30 p.m.

  • Upcoming: During the holiday season (Thanksgiving to New Year’s Day), utility construction will pause at and around the intersection of Columbus and Union. The contractor will start this work again in January 2014. To ensure we are prepared for the arrival of the TBMs next year, work will continue through the holidays on private property within 1731-1741 Powell Street and the parking lot of 1455 Stockton Street.

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

08 November 2013 ~ 1 Comment

Construction Update | November 9-18

131106_1007_UMSWe have completed the current phase of work on Stockton Street and are restoring the construction zone. Stockton will reopen to traffic in time for the holidays.

During the next 10 days, tunneling and tunneling preparatory work will continue in SoMa, Union Square and North Beach. Work to prepare for station construction is continuing in Chinatown and northern SoMa. In southern SoMa, preparatory construction is planned to start the week of Nov. 18 (details below).

This section provides overviews of current and upcoming construction impacts in each neighborhood. For full descriptions, click here or 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):

  • New: We plan to begin potholing for utilities the week of November 18, on 4th Street between Bryant and King. This involves drilling holes and trenches in the street to confirm the locations of existing utility lines. Work hours will usually be Monday to Friday, 7 a.m. to 5 p.m. More details are in the Southern SoMa section and in this construction notice.
  • Continuing: 4th Street between Harrison and Bryant may fully close some evenings and weekends. Two lanes of traffic will remain open at all other times. On Bryant Street at 5th Street, the left lane and several parking spaces will remain closed. One lane of the I-80 off ramp at 4th and Bryant may be closed at night to allow for utility work.
  • Upcoming: Starting in 2014, additional construction will begin on 4th Street south of Bryant. Work includes relocation of several utility lines, construction of light-rail tracks and construction of an above-ground train station at 4th and Brannan. Impacts will vary during different phases of construction and on different blocks.

Northern SoMa (Market to Harrison)

  • New: None
  • Continuing: The two right lanes will remain closed on 4th Street between Howard and Folsom. South of Clementina, the sidewalk on the west side of the street is closed. To ensure safety, pedestrians should use the sidewalk on the other side of the street and cross the street at 4th and Howard.

    On 4th Street between Folsom and Harrison, the parking lane and one lane of traffic on the east side of the street will remain closed to allow for ground improvement work.

    4th Street between Market and Stevenson is reduced to two traffic lanes so we can improve the ground as the tunnel boring machines pass below. The work zone is on the east side of the street, in front of Ross. A temporary taxi stand is in place just south of Stevenson.

  • Upcoming: After completing preparatory work, we will begin building the Yerba Buena/Moscone Station in the coming months.

Union Square

  • New: We have completed construction of underground walls on Stockton Street and will be restoring the roadway over the next weeks. We expect to reopen Stockton Street the week of November 18.
  • Continuing: Stockton Street between Geary and Ellis will remain closed to vehicle traffic next week. Ellis Street between Stockton and Powell will remain closed to westbound traffic.
  • Upcoming: Construction of the Union Square/Market Street Station is starting next year. We will provide more information soon.

Chinatown:

  • New:  Washington Street between Stockton and Trenton may close to vehicles and pedestrians the week of Nov. 18. This closure will allow us to relocate utilities and build an underground station wall in this area. The closure is expected to last for approximately two years.

    On Stockton Street, the sidewalk in front of 933-949 Stockton is planned to reopen next week.

  • Continuing: Building demolition at 933-949 Stockton Street is nearing completion. The contractor continues performing utility work on Stockton at Washington, and on Stockton between Sacramento and Washington. Expect parking impacts around construction zones. One lane of Washington just west of Stockton will remain closed.
  • Upcoming: Within the Chinatown Station site, we are performing archeological surveys and environmental assessments in preparation for station preparation next year.

North Beach:

  • New: On Saturday, November 9 and 16, construction will take place within the Pagoda Palace property. Work hours on the 9th are 7 a.m. to 3:30 p.m. Work hours on the 16th are 7 a.m. to 7 p.m.

    For some weeknights next week, the contractor will install monitoring equipment on Powell, Columbus and Union near Marini Park. A small work zone will be set up around the contractor’s truck, and traffic will be diverted around it. Work hours will be 7:30pm to 5am. Please contact Andrea Baker at 415-351-8427 with any questions about the specific schedule.

  • Continuing: At the Pagoda, construction hours will usually be Monday to Friday, 7 a.m. to 3:30 p.m., though later work hours (until 7 p.m.) and Saturday work may be required. Parking and walkways may be impacted in front of the Pagoda Palace property.

    Utility work will continue at and near the intersection of Columbus Ave and Union Street. This work will complete the utility relocation started last year. More details are included in the North Beach section and in this flier.

    In the Bank of America parking lot at 1455 Stockton, crews are constructing a shaft 20 feet in diameter and 27 feet deep, for use to improve ground conditions when the TBMs pass beneath Columbus Avenue. The parking lot will be closed but the banking drive-thru will remain open. Work hours are Monday to Friday, 7 a.m. to 3:30 p.m.

  • Upcoming: The tunnel boring machines arrive in North Beach in spring 2014. After tunneling beneath Columbus Avenue, they will arrive at the old Pagoda Palace site for removal from the area.

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

-The Central Subway Team