FINAL UPDATE: The second coach is back in service on the 35. The 37 coach is returning to regular service on the 37 Route. (More: 27 in last 48 hours)

Twin Peaks Tunnel Weekend Closure: April 15-16, 2023

Service Affected
Weekend Traffic and Transit Advisory
Neighborhoods Affected

SFMTA will close the Twin Peaks Tunnel between Castro and West Portal stations from 8 a.m. on Saturday, April 15, through midnight on Sunday, April 16, to complete a detailed ceiling inspectionDuring the closure service for the K Ingleside, M Ocean View, and L Taraval Bus will be modified. 

As part of our ongoing Twin Peaks Tunnel Inspection Project, SFMTA will complete a detailed structural inspection of the over two-mile-long Twin Peaks Tunnel. The inspection will require close up, in-person visual inspection as well as non-destructive testing.

This work requires significant preparation including de-energization of the overhead lines, shutdown of the track, staging of tools and equipment, mobilization of trackside equipment, and up-close inspection of the tunnel ceiling that will be performed during non-revenue hours. Multiple teams will work around the clock to complete the work. Further inspections will be scheduled at a later date and may also require service changes.

Note: Be sure to receive Muni service alerts via email or text by signing up through our Email and Text Subscriptions page.

Transit Service Plan

  • Forest Hill and West Portal stations will be closed.
  • K, L and M buses will operate:
    • K Bus and M Bus will run between Church Station and Balboa Park Station.
    • L Bus will run between Church Station and the zoo.
    • Riders traveling downtown can transfer to a Shuttle train at either Castro or Church stations.
  • S Shuttle trains will run between Castro and Embarcadero stations.
    • Riders traveling beyond Castro Station will need to transfer to a K, L or M Bus at either Church or Castro stations.
  • J Church, N Judah, and T Third Street trains will operate regular service.
  • Next Muni predictions will be operating to provide arrival information to riders.

Service Map

Twin Peak Tunnel Closure Service Map