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Seiderville Road Bridge


Looking South

Photo taken by Royce and Bobette Haley in January 2018


BH Photo #415638


Street View 


Through truss bridge over Saucon Creek on Seiderville Rd in Bethlehem
Bethlehem, Northampton County, Pennsylvania
Intact but closed to all traffic
Built 1936
Pratt through truss
Length of largest span: 130.9 ft.
Total length: 134.8 ft.
Deck width: 18.0 ft.
Vertical clearance above deck: 16.0 ft.
Eligible for the National Register of Historic Places
Approximate latitude, longitude
+40.59103, -75.34771   (decimal degrees)
40°35'28" N, 75°20'52" W   (degrees°minutes'seconds")
Approximate UTM coordinates
18/470577/4493417 (zone/easting/northing)
Quadrangle map:
Inventory numbers
PA 48 7301 0000 9019 (Pennsylvania Bridge Management System number)
PANBI 28904 (Pennsylvania BRKEY bridge number on the 2011 NBI)
BH 31439 (Bridgehunter.com ID)
Inspection report (as of June 2018)
Overall condition: Poor
Superstructure condition rating: Imminent Failure (1 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Poor (4 out of 9)
Sufficiency rating: 34 (out of 100)
View more at BridgeReports.com

Update Log 

  • July 13, 2020: New photos from Patrick Gurwell
  • January 4, 2018: New photos from Royce and Bobette Haley
  • October 29, 2017: New Street View added by Dave King
  • October 24, 2017: Updated by Royce and Bobette Haley: Pin, road name, status


  • Dave King - DKinghawkfan [at] hotmail [dot] com
  • Royce and Bobette Haley - roycehaley111 [at] yahoo [dot] com
  • Patrick Gurwell - pgurwell [at] gmail [dot] com


Seiderville Road Bridge
Posted January 4, 2018, by Nathan Holth (webmaster [at] historicbridges [dot] org)

Royce, please check out my narrative for this bridge for a full discussion. http://historicbridges.org/bridges/browser/?bridgebrowser=pe...

See also another example structure (and note the Historic Bridge Inventory comments)


In short, the construction date for this bridge is accurate, and no welded trusses were not common in the 1930s, although other examples (usually pony trusses) can be found in Pennsylvania and New Jersey. The technology began to be used (in limited quantities) starting in the late 1920s, although the 1933 examples are the oldest dated examples I have personally documented.

Seiderville Road Bridge
Posted January 4, 2018, by Royce and Bobette Haley (roycehaley111 [at] yahoo [dot] com)

My guess is this bridge is much younger than the 30's. Would it be common to have a completely welded bridge in the 30's?


High Street Bridge
Posted June 19, 2011, by Matt (homicide_md [at] yahoo [dot] com)

This bridge is currently closed to traffic, and it is located on Seidersville Road within the Bethlehem city limits. The road doesn't become High St. until it crosses the city line into Hellertown Borough which is on the east side of the former Conrail (originally originally the Reading's North Penn branch line) right-of-way.