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Duquesne Slag Bridge

Duquesne Slag Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: July 14, 2011

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Key Facts

Monaca: Beaver County, Pennsylvania: United States
Construction Date and Builder / Engineer
1928 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
Not Available
Structure Length
377 Feet (114.9 Meters)
Roadway Width
28 Feet (8.53 Meters)
5 Main Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

This bridge, which carries a private road over railroad and a state route, is of most unusual design. It is a deck truss cantilever bridge, however the trusses are not variable depth like most cantilever truss bridges. Instead, trapezoidal-shaped trusses extend beyond the steel bents to hold suspended a suspended span, or at the eastern end, a span suspended at one end and resting on the abutment at the other end.

Information and Findings From Pennsylvania's Historic Bridge Inventory

Discussion of Bridge

The 5-span, 377'-long, riveted Warren with verticals deck truss built in 1928 is supported on concrete abutments and steel bents. The trusses and the bents have rolled section. The bridge is historically and technologically significant as an early example of the use of rolled section for substructure and superstructure members that made fabrication and erection simpler than with built up sections. The bridge appears to be complete.

Discussion of Surrounding Area

The bridge carries a two-lane private road over a four-lane road and four railroad tracks at the Jones & Laughlin mill slag yard is north of the mill. The bridge crosses rail lines associated with operation of the slag yard. The area of the former Jones & Laughlin mill near the bridge does not have integrity of original design since the buildings and equipment have been removed. The site is being redeveloped as a jail.

Bridge Considered Historic By Survey: Yes


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