(covers information from several alternate timelines)
In the 20th century, this wharf was where city residents and tourists embarked and disembarked on the MUNI cable car route Powell & Mason. The name of this wharf was mentioned on a destination sign posted on the car's front.
In 1986, its location was labeled on a MUNI system map. Later that year, when Hikaru Sulu flew a helicopter over San Francisco Bay, this wharf was visible in the background. (Star Trek IV: The Voyage Home)