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UCSF Mission Bay Platform Upgrade

CLOSED: UCSF Mission Bay, Gene Friend Way Platform

Starting November 12, 2018

In anticipation of the new Golden State Warriors’ Chase Center and the growth in jobs, housing, healthcare and retail in the Mission Bay, the SFMTA is constructing a new center platform along 3rd Street between South and 16th streets. This new, larger platform will service both the inbound and outbound trains and greatly expand transit capacity in preparation for large crowds. The two existing platforms, which are split as separate inbound and outbound, will be demolished as part of the project. The greater size of the new and improved platform will enable four, two-car trains to load simultaneously during larger events. When needed, the platform will also allow for trains to depart inbound from both sides of the platform to connect customers quickly to BART, CalTrain and eventually the Central Subway.

During parts of fall 2018 and winter 2019, work on the platform will require bus substitution on a portion of the KT: K Ingleside/T Third line. K Ingleside trains will operate from Balboa Park to Embarcadero Station. T Third Buses will travel from Spear & Market to Bayshore Boulevard and Sunnydale Avenue. Buses will service all stops on the surface and signs will help direct customers to the boarding locations. Some stops will have modified locations due to construction activities. Customers traveling on Muni Metro with a destination towards Bayshore and Sunnydale should transfer to a T Third bus at Embarcadero Station.

T Third Bus SubstitutionT Bus Icon

The T Third line will be replaced with bus service. Please visit the T Third Bus Substitution page for information on NextMuni predictions, schedules and boarding locations.

Construction Schedule and Summary (Updated 2/5/2019)
Phase Start End Work Happening

November 25, 2018
2 a.m.

November 26, 2018
4 a.m.

Partial platform demolition, including cutting concrete on platform

Part of 3rd St will be closed and Muni will reroute


November 30, 2018
8 p.m.

December 3, 2018
4 a.m.

Full demolition of platform, some track work

Part of 3rd St will be closed and Muni will reroute

C Tuesday
January 22, 2019
5 a.m.

February 9, 2019
4 a.m.

Track work, begin platform reconstruction 

Part of 3rd St will be closed and Muni will reroute


February 9, 2019
4 a.m.

End of March 2019

Continue and finish platform construction

3rd St will reopen to traffic

T Third rail service returns Monday, April 1, 2019, but work on the Mission Bay Platform will continue. Board the T Third train at either Mission Rock or Mariposa.

Other Muni Changes

  • E Embarcadero Shutdown Tuesday, January 22, 2019 through March due to Phase C and D construction.
  • 83X Shutdown Tuesday, January 22, 2019 through March due to Phase C and D construction.



Construction elements included in the project:

  • Remove the two existing platforms at 3rd and South streets
  • Build a new center island platform
  • Widen the track to accommodate the new island platform
  • Install new overhead wires that power trains
  • Update utility lines and street lights to support the new center island platform
  • Upgrade the traffic signals at 3rd and South streets as well as 3rd Street and Campus lane  
    Project Timeline 
    Summer 2018
    Planning and design
    Early 2019
    Bus Substitution
    Late Spring 2019
    Substantial Completion
    Cost Estimate 
    $50 M
    Predicted Completion 
    Late Spring 2019
    Project Status 
    Project Success 
    On budget
    On schedule
    SFMTA Muni Metro train icon
    SFMTA Accessibility icon


      Contact Information 
      Erin McMillan