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Seaman Bridge

Dauphin County, Pennsylvania, and Northumberland County, Pennsylvania
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Photos 

View from south end looking north east

Photo taken by Jodi Christman on 05/11/2012

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Map 

Description 

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.

View Uglybridges.com report

Facts 

Overview
Baltimore Through truss bridge over Mahantango Creek on Deibler Gap Road
Location
Dauphin County, Pennsylvania, and Northumberland County, Pennsylvania
Status
Closed to all traffic
History
Built ca. 1900
Builder
- Chambersburg Bridge Co.
Design
Baltimore through truss
Dimensions
Length of largest span: 162.1 ft.
Total length: 168.0 ft.
Deck width: 14.1 ft.
Vertical clearance above deck: 12.0 ft.
Recognition
Posted to the National Register of Historic Places in 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)
USGS topographic map
Elizabethville
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 (as of 08/2007)
Deck condition rating: Imminent Failure (1 out of 9)
Superstructure condition rating: Imminent Failure (1 out of 9)
Substructure condition rating: Fair (5 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 13.6 (out of 100)
Average daily traffic (as of 1989)
1

Categories 

Baltimore through truss (149)
Baltimore truss (163)
Built during 1900s (4,247)
Chambersburg Bridge Co. (1)
Closed (2,072)
Dauphin County, Pennsylvania (73)
NR-listed (2,354)
Northumberland County, Pennsylvania (35)
One-lane traffic (7,112)
 Owned by county (16,490)
Pennsylvania (3,038)
Pin-connected (1,521)
Span length 125-175 feet (2,955)
Structurally deficient (16,681)
Through truss (9,210)
Total length 125-175 feet (4,137)
Truss (23,574)
Wooden deck (5,398)

Update Log 

  • 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

Sources 

  • Cliff Darby - clif30 [at] hotmail [dot] com
  • Jodi Christman - masterofchaos [at] outlook [dot] com

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