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School House Road Bridge

Lancaster County, Pennsylvania
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Description 

FROM THE 1996-2001 PENNSYLVANIA HISTORIC BRIDGE SURVEY: The 2 span, 148'-long, rivet-connected Warren with verticals pony truss bridge built in 1932 is supported on concrete pier and abutments with flared wingwalls. The truss members are built-up of standard steel sections. Channel railings are set to the inside faces of the trusses. Rolled floorbeams and stringers carry an open steel grid deck. The bridge has been altered by steel plate welded to the lower chords (ca. 1970). The Warren truss design emerged as one of the most commonly used truss designs after 1895 because of advances in metallurgy and the mid-1890s improvements to field pneumatic riveting. The result was a rapid shift from pinned to riveted connections and the Warren design was particularly well suited for rigid connections. Over 125 examples of the type/design have been identified in the state from the late 1890s to 1956. This late example has no noteworthy features or details. It has been altered by welded repairs. The bridge is not historically or technologically distinguished by its setting or context.

Facts 

Overview
Lost Pony truss bridge over Little Conestoga Creek on School House Road
Location
Lancaster County, Pennsylvania
Status
Gone, replaced with concrete bridge.
History
Built 1932; rehabilitated ca. 1970
Builder
- H. W. Crawford
Design
Warren pony truss
Dimensions
Span length: 148.0 ft.
Total length: 148.0 ft.
Deck width: 23.0 ft.
Also called
Little Conestoga Creek Bridge 2
Approximate latitude, longitude
+40.03150, -76.34242   (decimal degrees)
40°01'53" N, 76°20'33" W   (degrees°minutes'seconds")
Approximate UTM coordinates
18/385462/4432116 (zone/easting/northing)
USGS topographic map
Lancaster
Inventory numbers
PA 36 7223 0595 1202 (Pennsylvania Bridge Management System number)
BH 31122 (Bridgehunter.com ID)
Inspection (as of 08/2006)
Deck condition rating: Excellent (9 out of 9)
Superstructure condition rating: Excellent (9 out of 9)
Substructure condition rating: Very Good (8 out of 9)
Sufficiency rating: 97.1 (out of 100)
Average daily traffic (as of 2006)
6,100

Categories 

Built 1932 (730)
Built during 1930s (8,548)
H. W. Crawford (7)
Lancaster County, Pennsylvania (121)
Lost (10,351)
Owned by county (16,482)
Pennsylvania (3,037)
Pony truss (13,214)
 Replaced by new bridge (7,130)
Riveted (1,011)
Skewed (4,080)
Span length 125-175 feet (2,950)
Total length 125-175 feet (4,134)
Truss (23,558)
Warren pony truss (1,987)
Warren truss (3,955)

Update Log 

  • May 26, 2012: Updated by Jodi Christman: Added builder and description
  • April 30, 2009: Updated by Brian McKee: Bridge has been replaced
  • April 26, 2009: Updated by Brian McKee

Sources 

  • Brian McKee - bjmckee51 [at] yahoo [dot] com
  • Jodi Christman - masterofchaos [at] outlook [dot] com

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