SAN FRANCISCO-OAKLAND BAY BRIDGE
Each individual tower of the bridge, standing more
than 700 feet high from the base of its pier on the floor of
the bay to its tip, represents a construction job compar-
able to that of a great skyscraper 60 stories high.
The two suspension bridges have 2310 foot main spans.
The lower deck carries two tracks for interurban electric
cars and three lanes for heavy trucks, and the upper deck
carries a 58-foot highway for six lanes of automobiles.
No. 25
PUB. BY J. C. BARDELL, SAN FRANCISCO
