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6th Street Bridge

Roberto Clemente Bridge

6th Street Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: June 12, 2004 and July 16, 2011

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Key Facts

Facility Carried / Feature Intersected
6th Street Over Allegheny River
Pittsburgh: Allegheny County, Pennsylvania: United States
Structure Type
Metal Through Plate Girder Stiffening Eyebar Chain Suspension, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
1928 By Builder/Contractor: American Bridge Company of New York, New York and Engineer/Design: Allegheny County Department of Public Works, Vernon R Covell

Technical Facts

Rehabilitation Date
Main Span Length
430 Feet (131.1 Meters)
Structure Length
995 Feet (303.3 Meters)
Roadway Width
38 Feet (11.58 Meters)
3 Main Span(s) and 2 Approach Span(s)
NBI Number

Historic Significance Rating (HSR)
View Information About HSR Ratings

Bridge Documentation

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

View Historic American Engineering Record (HAER) Documentation For This Bridge

HAER Drawings, PDF - HAER Data Pages (Overview of All Three Sisters Bridges), PDF

The Sixth Street Bridge is one of three nearly identical bridges that sit by side and are known as the "Three Sisters Bridges." They are unusual bridges due to the fact that instead of having cables, they use eye-bars. This gives them quite a different appearance from the average cable suspension bridge. Stiffening for the bridge is accomplished by through plate girders. They were the first examples of self-anchored suspension bridges, meaning the eyebars tie into the the stiffening girders, but not to any anchorages. The bridge has a 430 Feet (292.6 Meters) span between towers, 960 Feet (11.6 Meters) total suspended length, and 39.7 Feet (12.1 Meters) of navigation vertical clearance. The listed Minimum Vertical Underclearance is 14.3 Feet (4.36 Meters) Over Highway.

The bridge apparently sometimes closes to vehicular traffic during games at PNC Park, allowing pedestrians to walk on the vehicular roadway. This is a great opportunity to photograph the bridge from the roadway without the nuisance of angry drivers honking their horns at you.

Above: Photo showing previous bridge at location. Source: Library of Congress


Photo Galleries and Videos: 6th Street Bridge

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