Twentieth Street Viaduct, Spans Platte River Valley between Thirty-third Avenue & Blake Street, Denver, Denver County, CO

See also Union Pacific Railroad Warehouse, HABS No. CO-128

Significance: It is the longest of Denver's viaducts. Its length grew from the need to cross not only the Platte River but also Denver's extensive railyards, thus to alleviate the problem of train-automobile and train-pedestrian accidents. Its 85 spans of carying lengths are supported by steel columns and concrete piers. Long spans, bridging the river and the tracks, are carried by Warren trusses; short spans are carried by plate girders at either side of the roadway.

Survey number: HAER CO-51

Building/structure dates: 1911 Initial Construction

steel truss bridges bridge construction civil engineering transportation urban growth vehicular bridges twentieth viaduct twentieth street viaduct platte platte river valley thirty third thirty third avenue blake blake street denver denver county colorado blodget construction company herbert samuel crocker historic american engineering record milwaukee bridge company luisa reyes photo ultra high resolution high resolution united states history railroad bridges bridge library of congress

1969 - 1980

Library of Congress

http://www.loc.gov/

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