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Portal Bridge

Portal Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: July 17, 2011

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Facility Carried / Feature Intersected
I-279 Over Point State Park Walkway
Location
Pittsburgh: Allegheny County, Pennsylvania: United States
Construction Date and Builder / Engineer
1968 By Builder/Contractor: Unknown and Engineer/Design: Richardson, Gordon, and Associates of Pittsburgh, Pennsylvania (George S. Richardson)
Rehabilitation Date
2002
Main Span Length
182.0 Feet (55.5 Meters)
Structure Length
186.0 Feet (56.7 Meters)
Roadway Width
154 Feet (46.94 Meters)
Spans
1 Main Span(s)
Inventory Number
2027900602009

Historic Significance Rating (HSR)
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Bridge Documentation

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

This bridge is a very unusual structure, not only because of its structural design, but also because bridges built in the late 1960s did not normally place as high a priority on aesthetics as this bridge did. The bridge was designed to deal with a large freeway that cut Point State Park off from downtown Pittsburgh, and to do so in a way that people would see a gateway to the park rather than an unsightly freeway. With a very shallow arch for a span of its length, the structure presents a pleasing but most unusual appearance. The design is equally unusual since it features a three hinge design as well as post-tensioning. The bridge is a ribbed arch bridge, but the ribs are covered with a curving shell for aesthetic purposes. George S. Richardson of Richardson, Gordon, and Associates was the engineer for the bridge.

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Photo Galleries and Videos: Portal Bridge

 

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Maps and Links: Portal Bridge

Coordinates (Latitude, Longitude):

Search For Additional Bridge Listings:

Bridgehunter.com: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

Bridgehunter.com: View listed bridges within 10 miles (16 kilometers) of this bridge.

HistoricBridges.org Bridge Browser: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

HistoricBridges.org Bridge Browser: View listed bridges within 10 miles (16 kilometers) of this bridge.

2021 National Bridge Inventory: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

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