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Seaman Bridge


View from south end looking north east

Photo taken by Jodi Christman on 05/11/2012


BH Photo #231913


THE 1996-2001 PENNSYLVANIA HISTORIC BRIDGE SURVEY notes that the 168'-long, pin-connected, Balitmore thru truss bridge was determined eligible for the National Register by PHMC.


Baltimore Through truss bridge over Mahantango Creek on Deibler Gap Road
Dauphin County, Pennsylvania, and Northumberland County, Pennsylvania
Closed to all traffic
- Nelson & Buchanan Co. of Chambersburg & Pittsburgh, Pennsylvania
Baltimore through truss
Length of largest span: 162.1 ft.
Total length: 168.0 ft.
Deck width: 14.1 ft.
Vertical clearance above deck: 12.0 ft.
Posted to the National Register of Historic Places on August 2, 1993
Approximate latitude, longitude
+40.62589, -76.85574   (decimal degrees)
40°37'33" N, 76°51'21" W   (degrees°minutes'seconds")
Approximate UTM coordinates
18/343046/4498884 (zone/easting/northing)
Quadrangle map:
Inventory numbers
PA 22 7212 0474 3027 (Pennsylvania Bridge Management System number)
PANBI 14693 (Pennsylvania BRKEY bridge number on the 2011 NBI)
NRHP 93000720 (National Register of Historic Places reference number)
BH 30840 (Bridgehunter.com ID)
Inspection report (as of August 2017)
Overall condition: Poor
Superstructure condition rating: Imminent Failure (1 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Imminent Failure (1 out of 9)
Sufficiency rating: 15 (out of 100)
View more at BridgeReports.com

Update Log 

  • January 10, 2021: New photos from Patrick Gurwell
  • July 13, 2020: New photo from Patrick Gurwell
  • May 13, 2012: Updated by Jodi Christman: Added category "Pin-connected"
  • April 13, 2012: Updated by Jodi Christman: Added builder and NR # and year
  • January 7, 2012: Updated by Jodi Christman: Corrected Road Name and added description note
  • May 27, 2010: Updated by Cliff Darby: Added GPS coordinates


  • Cliff Darby - cliffsta1987 [at] gmail [dot] com
  • Jodi Christman - masterofchaos [at] outlook [dot] com
  • Patrick Gurwell - pgurwell [at] gmail [dot] com


Seaman Bridge
Posted July 13, 2020, by George A Oakley (Georgeoakley49 [at] yahoo [dot] com)

From looking at the pictures I see that there's a porta-potty that's been by this bridge for the last 8 years.I'm not volunteering to go in there,that's for sure!