Like the three other shared Muni/BART stations in the Market Street subway, Powell has three underground levels. The first level is a fare mezzanine, with two Muni paid areas and two BART paid areas. The second level has a single island platform for Muni Metro, and the third level has an island platform for BART. The station has eight street entrances along its length, plus two underground entrances to the fare mezzanine from the basement level of the Westfield San Francisco Centre mall. A closed passageway leads from the northeast end of the station under Market Street partway to Third Street; this was planned to be a direct entrance from the Yerba Buena Center development, but was never completed. The under-construction Central Subway, expected to open in 2021, passes under the Powell station complex. The new Union Square/Market Street station will be located north of Powell station under Stockton Street. The stations will be connected outside of fare control by a passageway; the result will be a single integrated underground complex running all the way from Union Square to Market and Fifth Streets. The Stockton/Ellis entrance to the station was closed for a planned five years on April 24, 2013, so that it could be modified to include the connection to the new station. The closure was originally planned for the previous August, but delayed after Muni determined it was not yet needed. Muni purchased the entrance from BART for one dollar. Following the 2015 addition of a canopy over an escalator at 19th Street Oakland station, which reduced escalator downtime by one-third, BART decided to add canopies to all downtown Oakland and San Francisco entrances. The canopies will protect the escalator from weather damage, improve lighting, allow the escalator to be fully closed off when the station is not open, and provide a location for real-time train arrival information displays. The Powell station entrance at Market and Ellis was chosen for early implementation; it was closed on November 6, 2017, with the new canopy opened on September 29, 2018. Construction of the Market Street entrances will begin in 2020, with completion in 2027. In September 2015, BART released a report on possible modernization of the station. A total of $93 million in potential improvements were identified, including escalator replacement and canopy construction, a corridor to Cyril Magnin, a new mid-station elevator, platform screen doors, additional platform stairs, and numerous other projects. Bathrooms in underground BART stations were closed due to security concerns after the 9/11 attacks. In 2019, BART indicated plans to open a new bathroom with an attendant at Powell in 2021. In November 2019, the board issued an $11 million contract for improvements at Powell, with the bathroom expected to cost an additional $20 million. Pigeons living in the station are a nuisance, which has prompted BART to take countermeasures such as installing nets and metal screens to block their nesting spots. The pigeons are attracted by passengers littering and by nearby street food vendors.
Connections
Two Muni heritage streetcar stops are located above Powell Street station: Market and 4th Street / Market and Stockton, and Market and 5th Street. Both are served by the F Market and Wharves line. The Powell and Market turntable of the San Francisco cable car system, terminus of the Powell/Hyde and Powell/Mason lines, is located adjacent to the station next to Haladie Plaza. The station is also served by a number of Muni bus and trolleybus routes:
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AC Transit serves Powell Street station with the 800All Nighter route during hours that BART is not operating. The station is also served by Amtrak buses connecting to trains at Emeryville station. Additional Muni, Golden Gate Transit, and SamTrans bus routes run on Mission Street, one block away. Under the planned Better Market Street project, F stops would be consolidated to reduce travel times. The inbound stop at 5th Street and both stops at 4th Street would be discontinued, with a new inbound stop midway between 4th and 5th.