Stockton Street Tunnel

The Stockton Street Tunnel is a tunnel in San Francisco, California, which carries its namesake street underneath a section of Nob Hill near Chinatown for about three blocks. It was opened in 1914. The south portal is located at Bush Street, which is about two blocks to the north of Union Square. The north portal is located at the Sacramento Street intersection.

Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).