Dunlap's Creek Bridge

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Dunlap's Creek Bridge
Dunlap creek bridge jet lowe 1983.jpg
Carries National Road
Crosses Dunlap's Creek
Locale Brownsville, Pennsylvania
Designer Richard Delafield
Design arch bridge
Material cast iron
Longest span 24.4 metres (80 ft)[1]
Number of spans 1
Construction begin 1836
Construction end 1839

40°01′18″N 79°53′17″W / 40.02167°N 79.88806°W / 40.02167; -79.88806[2]

Dunlap's Creek Bridge
Dunlap's Creek Bridge is located in Pennsylvania
Dunlap's Creek Bridge
Coordinates 40°1′18″N 79°53′17″W / 40.02167°N 79.88806°W / 40.02167; -79.88806Coordinates: 40°1′18″N 79°53′17″W / 40.02167°N 79.88806°W / 40.02167; -79.88806
Governing body State
NRHP Reference # 78002398[3]
Added to NRHP July 31, 1978

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.


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]


See also[edit]


  1. ^ Dunlap's Creek Bridge at Structurae
  2. ^ The First Cast Iron Bridge: Historical Marker Database
  3. ^ "National Register Information System". National Register of Historic Places. National Park Service. 2008-04-15. 
  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". Historic American Engineering Record. Washington, D.C.: Library of Congress. p. 1. Retrieved February 1, 2014. 


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

External links[edit]