20th Street Viaduct 1992.

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20th Street Viaduct 1992.

Documents regarding the 20th Street Viaduct in Denver, Colorado, including blueprints, correspondence, and information from the Historic American Engineering Record, National Park Service.

5 items.

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Historic American Engineering Record

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The Historic American Engineering Record (HAER) document achievements in architecture, engineering, and landscape design in the United States and its territories through a comprehensive range of building types, engineering technologies, and landscapes, including examples as diverse as the Pueblo of Acoma, houses, windmills, one-room schools, the Golden Gate Bridge, and buildings designed by Frank Lloyd Wright. Administered since 1933 through cooperative agreements with the National Park Service,...