Twin Peaks Tunnel Upgrade Work: Saturday & Sunday, July 20-21, 2024

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All Hours of Service, Saturday & Sunday

Service Affected
Weekend Traffic and Transit Advisory


The Twin Peaks Tunnel has over a century of service under its belt and needs work to keep up with the demands of time and the Muni system. The SFMTA conducts regular inspections and structural evaluations of the tunnel, and expects to make additional improvements to the tunnel over the next 5-10 years to keep it safe and reliable for years to come. We are doing everything we can to keep the shutdown durations short and will work closely with riders, merchants, and residents to minimize any disruptions. This weekend's closures will allow us to conduct trials of the tunnel repairs, with full repairs to be completed during an eight-day closure in August. This closure also allows us to consolidate the repair work with needed track maintenance, completing multiple projects at once and minimizing construction impacts. 

For more details including upcoming closure dates, please visit our project page.

Muni Service Changes

During construction, the subway will operate from Embarcadero to Castro stations, and we will run bus shuttles between both Castro and Church stations and the outer rail terminals at Balboa Park (K Ingleside and M Ocean View) and Wawona St & 46th Ave (L Taraval).

  • West Portal and Forest Hill stations will be closed all day. Please use K, L or M bus shuttle substitutions on the surface.
  • M Buses and K Buses will run between Balboa Park and Church, with stops at West Portal, Forest Hill, Castro and Church.
  • L Buses will be extended to run between SF Zoo and Church, with stops at West Portal, Forest Hill, Castro and Church.
  • S Shuttle trains will run special service between Castro and Embarcadero stations, serving all stations in between.
  • J, N and T trains will run as usual. Transfer between underground Muni Metro trains and K, L and M buses at Church or Castro.

Service Map

Map of Muni Metro service during Twin Peaks Tunnel Upgrade work