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Red Rock Bridge



FROM THE 1996-2001 PENNSYLVANIA HISTORIC BRIDGE SURVEY: The skewed, 3-span continuous, 145'-long, steel stringer bridge built in 1935 is supported on concrete piers and abutments with wingwalls. The rolled steel section beams are made continuous by riveted splice plates. The two-rail high railings are composed of a pipe hand rail, resil-flex guide rail, and concrete posts. The continuous design with riveted splice plates was an important improvement in steel stringer and girder bridges beginning nationally in the late 1920s and 1930s. It was adopted somewhat later in Pennsylvania and this 1935 bridge by Adams County Engineer James B. Long is one of the earliest identified in the state. It is one of two similar bridges in the county (see BMS# 01720401473123, 1936). The continuous design achieved economy of material in comparison to simply supported spans of similar length. It was adopted by the state highway department as a standard design in the late 1930s and early 1940s, and built in increasing numbers after WW II. The bridge is historically and technologically significant as marking the introduction of an important advance in steel stringer design.


Continuous Steel Stringer bridge over Marsh Creek on Red Rock Road
Gettysburg, Adams County, Pennsylvania
Open to traffic
- James B. Long
- John H. Swagner
Three Span Continuous Steel Stringer (Beams Made Continuous By Riveted Splice Plates)
Length of largest span: 47.9 ft.
Total length: 145.0 ft.
Deck width: 22.0 ft.
Eligible for the National Register of Historic Places
Also called
Black Horse Tavern Road Bridge
Approximate latitude, longitude
+39.78380, -77.27620   (decimal degrees)
39°47'02" N, 77°16'34" W   (degrees°minutes'seconds")
Approximate UTM coordinates
18/305083/4406240 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 2009)
Inventory numbers
PA 01 7204 0327 3119 (Pennsylvania Bridge Management System number)
PANBI 00399 (Pennsylvania BRKEY bridge number on the 2011 NBI)
BH 47618 (Bridgehunter.com ID)
Inspection report (as of July 2017)
Overall condition: Fair
Superstructure condition rating: Very Good (8 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 89 (out of 100)
View more at BridgeReports.com

Update Log 

  • December 26, 2011: Updated by Jodi Christman: Added builder and add'l street name
  • March 21, 2011: Updated by Nathan Holth: Verified and corrected bridge type, listed as NR Eligible.
  • January 11, 2011: Updated by Matthew Lohry: Corrected bridge info; added NBI info
  • January 11, 2011: Added by Daniel Hopkins


  • Daniel Hopkins - chimera [at] clovermail [dot] net
  • Matt Lohry
  • Nathan Holth
  • Jodi Christman - masterofchaos [at] outlook [dot] com