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Dunlap's Creek Bridge

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Dunlap's Creek Bridge
Coordinates40°01′18″N 79°53′17″W / 40.02167°N 79.88806°W / 40.02167; -79.88806[1]
Dunlap's Creek Bridge
Dunlap's Creek Bridge is located in Pennsylvania
Dunlap's Creek Bridge
NRHP reference No.78002398[2]
Added to NRHPJuly 31, 1978
CarriesNational Road
CrossesDunlap's Creek
LocaleBrownsville, Pennsylvania
Characteristics
Designarch bridge
MaterialCast iron
Longest span24.4 metres (80 ft)[3]
No. of spans1
History
DesignerRichard Delafield
Construction start1836
Construction end1839
Location
Map

Dunlap's Creek Bridge was the first cast iron, metal arch bridge in the United States. It was designed by Richard Delafield and built by the United States Army Corps of Engineers.[4] Constructed from 1836 to 1839 on the National Road in Brownsville, Pennsylvania, it remains in use today. It is listed on the National Register of Historic Places and is a National Historic Civil Engineering Landmark (1978). It is located in the Brownsville Commercial Historic District.

History

There have been four structures on this site. The first two collapsed in 1808 and 1820. The third, a wood-framed structure, needed replacement by 1832.[5]

This bridge is constructed using five parallel tubular ribs, each made of 9 elliptical segments to form the 80 feet (24 m) arch.[4]

Image

  • Plaque commemorating Dunlap's Creek Bridge
    Plaque commemorating Dunlap's Creek Bridge

See also

Notes

  1. ^ The First Cast Iron Bridge: Historical Marker Database
  2. ^ "National Register Information System". National Register of Historic Places. National Park Service. April 15, 2008.
  3. ^ Dunlap's Creek Bridge at Structurae
  4. ^ a b Jackson, Donald C. (1996). Great American Bridges and Dams. New York: Wiley. ISBN 0-471-14385-5.
  5. ^ Murphy, Kevin (June 1984). "Dunlap's Creek Bridge" (PDF). Historic American Engineering Record. Washington, D.C.: Library of Congress. p. 1. Retrieved February 1, 2014.

References

  • Vivian, Cassandra (2003). The National Road in Pennsylvania. Arcadia Publishing. pp. 85–86. ISBN 0-7385-1166-8.


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