Boone Viaduct

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Also known as: Chicago & Northwestern Railroad:Boone Viaduct
W of Boone, Boone, Iowa

Pratt deck truss bridge over Des Moines River on Union Pacific Railroad (formerly Chicago & Northwestern Railway) near Boone



This bridge is one of the last projects of noted bridge engineer George Morison, who died two years after the structure was built. The bridge was the longest and heaviest viaduct of its time, and may be the longest extant double-track railroad viaduct in the world. It is listed in the National Register of Historic Places. -- Historic American Engineering Record (HAER IA-44)

National Register information 

Note: The following information comes from the NRHP database and has not been verified.
Posted to the National Register of Historic Places on November 17, 1978
Reference number
Architectural style
Other architectural type; Pratt deck truss
Areas of significance
Engineering; Transportation
Level of significance
Evaluation criteria
A - Event; C - Design/Construction
Property type
Historic function
Current function
Periods of significance
1900-1924; 1875-1899
Significant years
1899; 1900; 1901