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The Central Subway is the second phase of the Third Street Light Rail line, which opened in 2007. The Central Subway will extend this line northward from its current terminus at 4th and King Streets to a surface station south of Bryant Street and go underground at a portal under US 101. From there it will continue north to stations at Moscone Center, Union Square—where it will provide passenger connections to the Powell Street Station and BART—and at Chinatown, where the line will terminate. The Central Subway is expected to carry nearly 73,000 passengers a day, making it the second most utilized rail project in the Federal New Starts Program. On March 30, 2010 the Authority Board adopted a Baseline Budget, Schedule and Funding Plan for the project.
On September 19, 2011, the San Francisco Municipal Transportation Agency (SFMTA) submitted to the Federal Transit Administration (FTA) its request for the Central Subway project's Full Funding Grant Agreement (FFGA), the most significant funding-related milestone in the New Starts process. Approval of the FFGA, expected in July 2012, is the FTA's official commitment of the remaining $849 million in federal New Starts funds to the project and is a necessary milestone that allows the project to move forward into the major construction phase. In February 2012, the FTA informed the SFMTA that the project would receive $85 million in Fiscal Year 2011/12 New Starts funds, signaling the upcoming decision on the FFGA.
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Above left: tunnel boring machines, similar to these, will make their way beneath the city from 4th and Harrison to Stockton and Washington streets. Above: Utility relocation at Union Square. Below: A visualization of the Chinatown Station, and the station area at Union Square.
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The project is nearing the completion of Final Design, and the program focus has shifted to the Early Construction phase. Consistent with FTA guidelines, work is under way on the Early Construction phase that includes three construction contracts. Utility Relocation 1, in the area of the Yerba Buena/Moscone Station and at the tunnel portal is now complete. Utility Relocation 2, in the area of the Union Square Station, will be completed in May 2012.
The first major construction contract for the project, the Tunnels contract, was awarded in June 2011, to the Joint Venture of Barnard/Impregilo/Healy. It consists of 1.5 miles of twin-bore tunnels underneath Fourth Street and Stockton Street, from I-80 to North Beach. Its major components include tunnel boring machine (TBM) procurement, construction of the TBM launch box and cross passages, construction of extraction shaft and portal, headwalls for the Union Square and Moscone stations, among other elements. The contractor has mobilized and has ordered the two TBMs from The Robbins Company of Solon, Ohio. The SFMTA advertised for bids for construction of the Chinatown Station on February 27, 2012 and the Union Square station on April 13. The Moscone Stations will follow in May 2012. The Systems contract will be advertised in the fall of 2012.
The total project budget is $1.58 billion, and the SFMTA has identified full funding from a combination of local, state, and federal sources. The primary funding source for the Central Subway is anticipated to be federal New Rail Starts dollars. To date, the project has received $93.6 million in funds programmed by the Authority and $89.9 million in federal funds. Revenue service is scheduled for 2018.
Project Goals
- Extend the north-south corridor of MUNI's Metro System
- Provide shorter travel times for passengers
- Relieve congestion on the Stockton Street corridor
- Provide connectivity to a future Geary line.
FACT SHEET
Download the latest Central Subway Fact Sheet.
TIMELINE
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