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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.

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

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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.

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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.

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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.

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

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Underground, crews connect the cutter head to the shield.

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

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

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

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

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

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

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

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

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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!

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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

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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.

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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.”

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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

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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

01 November 2013 ~ 0 Comments

Construction Update | November 2-11

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Beneath 4th Street, segments of the new subway tunnels are delivered underground. Our first tunnel boring machine, Mom Chung, has now built about 1,400 feet of tunnel.

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. 11 (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 11, on 4th Street between Bryant and Berry. This involves drilling small holes and trenches in the street to confirm the locations of existing utility lines. Potholing will start on 4th Street between Bryant and Brannan, on the east side of the street. Work hours will usually be Monday to Friday, 7 a.m. to 5 p.m. More details are in the Southern SoMa section.
  • 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 a sewer line and a storm drain, construction of light-rail tracks and construction of an above-ground train station at 4th and Brannan streets. Impacts will vary during different phases of construction and on different blocks. We will provide more information soon, and in a community meeting on November 7.

Northern SoMa (Market to Harrison)

  • New: Starting Monday, November 4, 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 will be on the east side of the street, in front of Ross. The temporary taxi stand that was in place in the previous phase of work will be reestablished.
  • Continuing: The two right lanes are now 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.

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 11.
  • 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:  Next week, water line work will be in progress in the intersection of Washington and Stockton. Traffic will be routed around the work zone.Tentative: Washington Street between Stockton and Trenton may close to vehicles and pedestrians late next week (details below).
  • Continuing: We are demolishing the building at 933-949 Stockton Street and performing utility work on Stockton at Washington. Expect parking impacts around construction zones. One lane of Washington Street will remain closed just west of Stockton Street.
  • Upcoming: Washington Street between Stockton and Trenton will close to vehicles and pedestrians during the first phase of Chinatown Station construction. This closure is expected to last approximately one year. This closure is planned to start in November and is tentatively planned for late next week.

North Beach:

  • New: In the Bank of America parking lot at 1455 Stockton, crews will begin constructing a shaft 20 feet in diameter and 27 feet deep, for use to improve ground conditions when the TBMs pass beneath Columbus Avenue. This work starts Monday, November 4, and will last for about six months. 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. We do not anticipate impacts to transit, roadways or pedestrian walkways as a result of this work.
  • 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.
  • 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.

25 October 2013 ~ 0 Comments

Construction Update | October 26-November 4

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On Stockton Street, we are beginning to restore the construction zone. We plan to reopen the road to traffic in November for the holiday season.

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.

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: None
  • 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: We expect to begin potholing for utilities on 4th Street between Bryant and King in the coming weeks. This involves drilling small holes and trenches in the street to confirm the locations of existing utility lines. A community meeting will be held in November to inform neighbors about this and other upcoming work. Look out for more information soon.

Northern SoMa (Market to Harrison)

  • New: Tentative: Next week, partial temporary lane closures may be in effect on Folsom Street near the intersection with 4th Street to allow for sewer surveys. This work may take place at night.
  • Continuing: The two right lanes are now 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: 4th Street between Market and Stevenson will be reduced to three traffic lanes so we can improve the ground as the tunnel boring machines pass below. The work zone will be on the east side of the street, in front of Ross. Expected start: mid-November.

Union Square

  • New: None
  • Continuing: Stockton Street between Geary and Ellis will remain closed to vehicle traffic. Ellis Street between Stockton and Powell will remain closed to westbound traffic.
  • Upcoming: Next month we will restore the area and reopen Stockton Street to traffic.

Chinatown:

  • New: Starting Monday, October 28, sewer line work on Stockton between Sacramento and Clay will impact sidewalks and the parking lane for about three days. Sidewalks will remain open but may be narrowed. Work hours are 7 a.m. to 3:30 p.m. On October 30 or 31, nighttime sewer work will take place on the same block. Work will start at 7 p.m. and last up to 15 hours.
  • Continuing: We are demolishing the building at 933-949 Stockton Street and performing utility work on Stockton between Sacramento and Jackson. Temporary partial lane closures will be required along Stockton Street as utility work progresses. Parking will also be impacted, and temporary bus stop relocations will be required. We will post notification of temporary bus stop locations at the impacted stops. The sidewalk adjacent to 933-949 Stockton will remain closed to pedestrians at least through the middle of next week. One lane of Washington Street will remain closed just west of Stockton Street.
  • Upcoming: Construction of the Chinatown Station. More details coming soon.

North Beach:

  • New: On Monday, October 28, we will begin work 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. Early in the morning on October 28, large equipment will be delivered to the Pagoda Palace site. This work will start around 3 a.m. and finish by 6 a.m. Traffic on Powell Street may be impacted. A pedestrian monitor will be on site to direct pedestrian traffic.
  • 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.
  • Upcoming: In the Bank of America parking lot at 1455 Stockton, crews will begin constructing a shaft 20 feet in diameter and 27 feet deep, for use to improve ground conditions when the TBMs pass beneath Columbus Avenue. This work is planned to start Monday, November 4, and last for about six months. The parking lot will be closed but the banking drive-thru will remain open. We do not anticipate impacts to transit, roadways or pedestrian walkways as a result of this work.

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

18 October 2013 ~ 0 Comments

Construction Update | October 19-28

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This week we demolished the gas station that stood at the future Yerba Buena/Moscone Station site. Seen from above, the site is now graded. In a few years, the station entrance will stand here.

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.

For descriptions of construction impacts in each neighborhood, click here or on the links below. We also post construction, traffic detour and Muni impact information on our project Google Map.

Construction impacts are planned to change at these locations by October 28:

  • Chinatown: In Chinatown, we are demolishing the building at 933-949 Stockton Street and performing utility work on Stockton between Sacramento and Jackson. Temporary partial street closures will be required along Stockton Street as utility work progresses. Parking will also be impacted, and temporary bus stop relocations will be required. We will post notification of temporary bus stop locations. The sidewalk adjacent to 933-949 Stockton will remain closed to pedestrians, and one lane of Washington Street may be closed just west of Stockton Street. Night work may be required.
  • Northern SoMa (Market to Harrison):  One lane of 4th Street between Mission and Howard will be closed until early next week to allow for installation of monitoring equipment. On 4th Street between Howard and Folsom, the two right lanes will close to traffic starting the evening of October 18 as we begin preparatory work for station construction in the roadway To set up this traffic pattern, work hours tonight are 8 p.m. to 6 a.m. The sidewalk south of Clementina will close to pedestrians during this phase of construction. 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.
  • North Beach: On Monday, October 28, we will begin work 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.Early in the morning on Tuesday, October 22, we will deliver a large crane to the Pagoda Palace site. This should take about an hour, starting around 4 a.m. Traffic on Powell Street may be impacted. A pedestrian monitor will be on site to direct pedestrian traffic.

    At other times at the Pagoda, we will continue to prepare for construction of a retrieval shaft to remove two tunnel boring machines. 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.

At these locations, current construction impacts are planned to continue until October 28:

  • Southern SoMa (Harrison to King/Berry): 4th Street between Harrison and Bryant may fully close some evenings and weekends to allow for the installation of tunneling components and piping. Two lanes of traffic will remain open at all other times. Contact us at central.subway@sfmta.com if you have questions about the closure schedule. 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.
  • Union Square: Stockton Street between Geary and Ellis will remain closed to vehicle traffic. Ellis Street between Stockton and Powell will remain closed to westbound traffic.

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

-The Central Subway Team

11 October 2013 ~ 0 Comments

Construction Update | October 12-21

130908_1004_CTS

Central Subway construction has started in Chinatown. The first work involves relocating and improving utility lines and demolishing the building at the future station site.

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.

For descriptions of construction impacts in each neighborhood, click here or on the links below. We also post construction, traffic detour and Muni impact information on our project Google Map.

Construction impacts are planned to change at these locations by October 21:

  • Chinatown: In Chinatown, work to prepare for station construction will continue in and around 933-949 Stockton. One lane of Washington Street may be closed just west of Stockton Street. Several parking spaces will be closed near the intersection of Stockton and Washington and adjacent to the future Chinatown Station site (933-949 Stockton). The sidewalk adjacent to the building will remain closed to pedestrians.
  • North Beach: At the Pagoda Palace site, we are continuing to prepare for construction of a retrieval shaft to remove two tunnel boring machines. 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.

At these locations, current construction impacts are planned to continue until October 21:

  • Southern SoMa (Harrison to King/Berry): 4th Street between Harrison and Bryant may fully close some evenings and weekends to allow for the installation of tunneling components and piping. Two lanes of traffic will remain open at all other times. Contact us at central.subway@sfmta.com if you have questions about the closure schedule. 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.
  • Northern SoMa (Market to Harrison):  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. On 4th Street between Howard and Folsom, one lane will remain closed to traffic south of Clementina. Demolition of the 76 gas station is in progress.
  • Union Square: Stockton Street between Geary and Ellis will remain closed to vehicle traffic. Ellis Street between Stockton and Powell will remain closed to westbound traffic.

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