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Mansfield Bridge

Dravosburg Bridge

Mansfield Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: July 20, 2019

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Key Facts

Facility Carried / Feature Intersected
Richland Avenue Over Monongahela River and Various Roads and Railroads
Dravosburg and McKeesport: Allegheny County, Pennsylvania: United States
Structure Type
Metal Cantilever 20 Panel Rivet-Connected Warren Through Truss, Fixed and Approach Spans: Metal Deck Girder, Fixed
Construction Date and Builder / Engineer
1951 By Builder/Contractor: American Bridge Company of New York, New York and Engineer/Design: Allegheny County Department of Public Works

Technical Facts

Rehabilitation Date
Main Span Length
500 Feet (152.4 Meters)
Structure Length
1,934 Feet (589.5 Meters)
Roadway Width
48 Feet (14.63 Meters)
3 Main Span(s) and 10 Approach Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

This is an outstanding, unaltered example of a mid 20th century cantilever truss bridge. Due to the staggering loss of older and more historic bridges over this river, this bridge, which once might have been beneath notice, is an increasingly rare and interesting example of a riveted truss bridge over a large river. The full name of the bridge is the W.D. Mansfield Memorial Bridge, named after William D. Mansfield, who served as an Allegheny County Commissioner and later as a State Senator. Reportedly, this bridge was under construction by 1948 and was made from steel specifically sourced from the melted scrap of the Wabash Bridge.

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

Information and Findings From Pennsylvania's Historic Bridge Inventory

Discussion of Bridge

The 13-span bridge has a 3-span, continuous thru truss main span with a suspended section (200'-500'-200') and 10 simple, built up deck grider approach spans. It was built in 1951, and it is supported on a concrete substructure. The cantilevered sidewalks are finished with standard-design metal railings. The main truss member are built up. Although a major river crossing, the large bridge has no innovative or distinctive details and is one of several similar cantilevered thru truss bridges design and built by the county after World War II. It utilizes engineering principles known and used since the late 1920s. Neither the bridge nor its setting/contexts are historically or technologically significant. The bridge is not historic in association with either of the railroads that it crosses.

Discussion of Surrounding Area

The bridge carries a barrier-divided, 4-lane road over the river, local streets, and railroads on both riverbanks. Conrail is on the west bank, and P & LE RR is on the east side of the river. The bridge links Dravosburg and McKeesport.

Bridge Considered Historic By Survey: No


Photo Galleries and Videos: Mansfield Bridge

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