Alvord Lake Bridge, San Francisco, San Francisco County, CA

Significance: This structure is the first reinforced concrete bridge in America. Though only 20 feet in span, the bridge utilized Ransome twisted steel bars and served as predecessor for thousands of reinforced concrete bridges built in the 20th century.

Survey number: HAER CA-33

Building/structure dates: 1889 Initial Construction

concrete arch bridges bridge construction people civil engineering pedestrian bridges vehicular bridges reinforced concrete construction golden gate alvord bridge alvord lake bridge san francisco san francisco county california city of san francisco historic american engineering record ernest l ransome jean p yearby photo ultra high resolution high resolution library of congress

1969 - 1980

Library of Congress

http://www.loc.gov/

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