San Francisco : Architect and Engineer, Inc · leaf 7
LINED with concrete 4 feet thick at the sidewallsand 3 feet at the crown, the Yerba Buena Tunneltakes its place in modern engineering achievement asthe largest bore tunnel in the world. It is 76 feet wide,58 feet high, and 540 feet long. Its double decks providefor 6 lanes of motor traffic, 3 lanes…
Architecture · Building
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
