Dunlap's Creek Bridge

Dunlap's Creek Bridge
File:Dunlap creek bridge jet lowe 1983.jpg
Coordinates	40°01′18″N 79°53′17″W
Dunlap's Creek Bridge
U.S. National Register of Historic Places
Dunlap's Creek Bridge is located in Pennsylvania Dunlap's Creek Bridge Dunlap's Creek Bridge is located in the United States Dunlap's Creek Bridge
Coordinates	40°1′18″N 79°53′17″W
NRHP reference No.	78002398
Added to NRHP	July 31, 1978
Carries	National Road
Crosses	Dunlap's Creek
Locale	Brownsville, Pennsylvania
Characteristics
Design	arch bridge
Material	Cast iron
Longest span	24.4 metres (80 ft)
No. of spans	1
History
Designer	Richard Delafield
Construction start	1836
Construction end	1839
Location

Dunlap's Creek Bridge is the first arch bridge in the United States built of cast iron. It was designed by Richard Delafield and built by the United States Army Corps of Engineers. 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 and supports Market Street, the local main thoroughfare. Due to the steep sides of the Monongahela River valley, there is only room for two short streets parallel to the river's shore and graded mild enough to be comfortable to walk before the terrain rises too steeply for business traffic.

File:BrownsvilleNeck.JPG

View of the once vibrant business strip, the Market Street historic district. Market Street's lowest stretch runs north of the ramp off the West Brownsville bridge for 3-4 blocks (about the scene here), whereafter it begins a steady climb to the end of the re-routed U.S. Route 40 bridge built at a much higher elevation near the site of the original settlement, the Tavern, Trading Post, and Inn near today's Bowman's Castle.

File:DunlapsCreekBridge.jpg

Plaque commemorating the first cast iron bridge built in the United States. This plaque is near or at the place the above picture of the Market Street was taken.

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

See also

• List of bridges documented by the Historic American Engineering Record in Pennsylvania
• List of Registered Historic Places in Fayette County, Pennsylvania
• List of historic civil engineering landmarks

References

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

External links

• Dunlap’s Creek Bridge: Historical Marker Database
• National Register nomination form
• Dunlap's Creek Bridge: History and Heritage of Civil Engineering
• Historic American Engineering Record (HAER) No. PA-72, "Dunlap's Creek Bridge, Spanning Dunlap's Creek, Brownsville, Fayette County, PA", 9 photos, 3 measured drawings, 25 data pages, 2 photo caption pages