SFMTA To Start Early Weekend Closures For Twin Peaks Tunnel

West Portal Station. | Photo: torbakhopper/Flickr
By Walter Thompson - Published on March 13, 2018.

Starting this weekend, the San Francisco Municipal Transportation Agency will close the Twin Peaks Tunnel early on Friday and Saturday nights to prepare for an extended summer shutdown that will allow the agency to make extensive repairs to the 100-year-old structure.

The West Portal and Forest Hill stations will close at 9pm on Friday and 11pm on Saturday for up to 15 weeks, reopening the following morning for regularly scheduled weekend service. 

In place of K, L and M light-rail vehicles, Muni will run shuttle buses between Embarcadero and each line's terminus every 20 minutes until 1am, when buses run every 30 minutes.

Although Castro Station will remain open, outbound trains will turn around during scheduled work periods and head back downtown. During the closures, Muni encourages inbound riders on the K-Ingleside line to transfer to BART at Balboa Park Station.

Work to improve safety, stability and speed along the century-old tunnel has been delayed repeatedly. A winter 2016 start date was pushed to April 2017, but before work could commence, Muni canceled the vendor's contract, citing the need for "additional technical analysis."

This summer, Muni will close the tunnel for up to two months to perform seismic upgrades, improve drainage and replace existing tracks so it can lift a speed restriction that's currently in place. 

View of construction inside the Twin Peaks Tunnel near Eureka Station, circa 1915. | Photo: SFMTA Photography Department & Archive

Additionally, workers will replace track-switching equipment, add new crossover tracks, improve structural supports between West Portal and Forest Hill, and improve the fire-suppression system at West Portal station.

Opened for service in February 1918, the 2.27-mile tunnel was the longest of its kind when it was completed. Today, it carries more than 80,000 riders daily, according to SFMTA.

The tunnel initially connected West Portal and the since-abandoned Eureka Valley station on Market Street, but after the Muni Metro created Castro Station approximately 100 yards to the west, Eureka Valley closed in 1972 and became the Bay Area's only ghost station.

Apr 16, 2021
San Francisco Castro Duboce Triangle

Castro cocktail bar Blackbird reopens after four-month hiatus with expanded outdoor seating

After a four-month hiatus, Castro cocktail bar Blackbird reopened Wednesday with expanded outdoor seating. Read More

Apr 14, 2021
San Francisco Glen Park

Glen Park’s adorably quaint Tyger’s Coffee Shop has permanently closed

The unpretentious, old-school omelette destination at Diamond and Chenery Streets closed April 1, though another cafe will apparently replace it. Read More

Apr 14, 2021
San Francisco Divisadero NoPa

Bay Area bagel boom continues with opening of Schlok's in NoPa

After months of operating a wildly popular bagel pop-up, Schlok's is getting set to open a brick-and-mortar shop at 1263 Fell Street, in a former laundromat off Divisadero in NoPa (in the same complex as RT Rotisserie and Nopalito). Read More

Apr 13, 2021
San Francisco SoMa

30-bed drug sobering center proposed for Howard Street office building

SF Mayor London Breed on Tuesday announced a proposal to lease an empty office building at 1076 Howard Street for use as a 30-bed drug sobering center, making good on a promise first made before the start of the coronavirus pandemic. The facility will focus on those living on the streets who are experiencing methamphetamine-induced psychosis. Read More