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Iron Bridge Trail Bridge

McNay Ridge Road Bridge

Iron Bridge Trail Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 3, 2013

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Key Facts

Rural: Greene County, Pennsylvania: United States
Construction Date and Builder / Engineer
1914 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Main Span Length
90 Feet (27.4 Meters)
Structure Length
96 Feet (29.3 Meters)
Roadway Width
13.8 Feet (4.21 Meters)
1 Main Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

This bridge sits in its original location, but carries a trail in Ryerson Station State Park. This trail follows an abandoned stretch of McNay Ridge Road. The bridge is the reason for the name of the trail: Iron Bridge Trail. It is one of the only preserved historic truss bridges in southwestern Pennsylvania. The bridge is a late example of a pin-connected truss bridge and omits the use of eyebars for diagonals except for the counters, which is not unusual among late pin-connected truss bridges. The built-up top chord and end posts have an uncommon appearance because the flanges of the channels face inward, not outward.

Information and Findings From Pennsylvania's Historic Bridge Inventory

Discussion of Bridge

The 96' long and 17' wide pin connected Pratt pony truss bridge supported on ashlar abutments with wingwalls has the floor beams placed above the lower chords. The bridge is dated 1914 making it a late example of its design. The trusses are traditionally composed, and the floor beams are rolled sections. There are some welded replacement of original members, especially at the lower chords. With no innovative or distinctive details, the bridge is not historically or technologically significant.

Discussion of Surrounding Area

The pedestrian bridge carried a park road over a stream in a sparsely developed, wooded setting in Ryerson Station State Park. The bridge, which is closed to vehicular traffic, connects a local road to a trail and picnic area. The land for the 1,164-acre park that has as its focus the 62 acre lake was acquired in 1958. The lake was created in 1960. The park was opened to the public in 1967. It was named for the 1792 Fort Ryerson. The park is not a potential historic district.

Bridge Considered Historic By Survey: No


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