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Petroleum Center Bridge

Eagle Rock Road Bridge

Petroleum Center Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: July 1, 2006

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Facility Carried / Feature Intersected
Eagle Rock Road (PA-1004) Over Oil Creek
Petroleum Center (Rural): Venango County, Pennsylvania: United States
Construction Date and Builder / Engineer
1884 By Builder/Contractor: Morse Bridge Company of Youngstown, Ohio
Rehabilitation Date
Main Span Length
117.0 Feet (35.7 Meters)
Structure Length
239.0 Feet (72.8 Meters)
Roadway Width
15.4 Feet (4.69 Meters)
2 Main Span(s)
Inventory Number

Historic Significance Rating (HSR)
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Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This bridge is located in the center of Oil Creek State Park, and it is worthy contender for the park's prime attraction, and most certainly is a fitting centerpiece to the park. The bridge is an extremely rare surviving example of a bridge built by the Morse Bridge Company, and one of the only known surviving multi-span example's of the company's work. Surviving through truss bridges built by the Morse Bridge Company are highly significant since the company was noted for varying its aesthetic treatment from bridge to bridge and so individual surviving bridges may be unique, the only one of their kind. This appears to be the case with the Petroleum Center Bridge as its triangular design, pedimented portal bracing is unlike any other known bridge by the company, with the only thing coming close being the decorative portal bracing seen on Six Mile Creek Road in Michigan, although that bracing has a curved design.

The Petroleum Center Bridge also displays some of the unusual construction details of older Morse Bridge Company bridges, notably the omission of any struts or sway bracing and the use of heavier angle for lateral bracing to compensate for this design. The bridge also has the unusual cast iron washers for the pins that the company was noted for. One unusual construction detail on this bridge not found on other Morse Bridge Company bridges is the v-lacing design on the verticals. The lacing bars do not have the standard rounded ends and also there are two rivets at the end of each bar instead of the usual single rivet. Furthermore, the lacing bars do not overlap and share rivers. These three noted design details of the v-lacing are not normally found on highway truss bridges, but is more common on railroad bridges.

It is also a wonderfully ornate structure, with Both the Six Mile Creek Road and the Eagle Rock Bridge were built by the Morse Bridge Company. The Eagle Rock Bridge is a particularly stunning example of the company's work since it is a two-span structure. The bridge features unusual "railroad style" v-lacing on the vertical members. I have not seen this v-lacing style, which features a separate rivet for each lacing piece, on many pin connected highway truss bridges. Restoration should be considered a priority for this bridge, although I am doubtful that it is.

Information and Findings From Pennsylvania's Historic Bridge Inventory

Discussion of Bridge

The 1884, pin connected, 2 span, 239'-long (2 @ 115'), Pratt thru truss bridge is supported on an ashlar substructure. The portal is detailed with corner brackets with pierced decoration and a lattice-filled pedimented top brace. The original floorbeams were built up sections, but a number of them and their hangers were replaced with rolled I sections in 1984. There are limited repairs to the verticals. The steel channel railings inside the truss lines were placed in 1947 as was the open grid steel deck. The bridge is historically and technologically significant as an early and fairly complete example of the important bridge type and as an example of the work of the Morse Bridge Company of Youngstown, OH.

Discussion of Surrounding Area

The bridge carries 1 lane of a road over a stream in Oil Creek State Park. The wooded setting with scattered, undistinguished 20th century residences does not have historic district potential.

Bridge Considered Historic By Survey: Yes


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