Historic Bridges
of the United States
Seaman Bridge
Dauphin County
,
Pennsylvania
Overview
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Map
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TopoZone
Terraserver USA
Facts
Overview
Through truss bridge over Mahantango Creek on Deibler Gap Road (TR 474)
Location
Dauphin County
,
Pennsylvania
Status
Closed to all traffic
History
Built ca. 1900
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
Eligible for the National Register of Historic Places
Approximate latitude, longitude
+40.62667, -76.85833
(decimal degrees)
40°37'36" N, 76°51'30" W
(degrees°minutes'seconds")
Approximate UTM coordinates
18/342828/4498974
(zone/easting/northing)
USGS topographic map
Pillow
Inventory numbers
PA 22 7212 0474 3027
(Pennsylvania bridge 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
(44)
Baltimore truss
(47)
Built during 1900s
(2,519)
Closed
(1,660)
Dauphin County, Pennsylvania
(27)
NR-eligible
(2,623)
One-lane traffic
(6,990)
Owned by county
(14,359)
Pennsylvania
(1,716)
Span length 125-175 feet
(2,045)
Structurally deficient
(12,077)
Through truss
(5,556)
Total length 125-175 feet
(2,737)
Truss
(16,273)
Wooden deck
(5,164)
Comments
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