The 106-year-old Twin Peaks Tunnel will close for eight days of repair work starting on Thursday, Aug. 22, to Thursday, Aug. 29.
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Transit officials previously said during the closure there will be no train service from West Portal and Forest Hill stations and instead require Muni Metro K Ingleside and M Ocean View passengers to take shuttle buses.
K and M buses will run from Balboa Park to Church, while making stops at West Portal, Forest Hill, Castro and Church. L Taraval buses will also extend their route to serve West Portal, Forest Hill, Castro and Church. S Shuttle trains will run during the closures between Castro and Embaracsdero stations.
Other rail lines such as the J Church, N Judah and T Third will run normally during the closures, the San Francisco Municipal Transportation Agency said.
SFMTA hired the engineering firm HNTB to inspect the old tunnel. HNTB recently released its findings and found distortion in the tunnel causing leaks and various cracks.
During the summer closure, the transportation agency will work on strengthening the tunnel’s ceiling in two sections by installing tie rods and filling areas with grout behind the tunnel’s lining where soil is loose.
After completing the repairs, the SFMTA will conduct routine structural evaluations of the tunnel. Additional improvements are expected over the next 5-10 years to keep the tunnel safe.
Transit officials said they are coordinating the project schedule with the San Francisco Unified School District which will begin construction at West Portal Elementary School, which sits atop the tunnel.
