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McKinley Bridge

McKinley Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: November 15, 2016

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Key Facts

Facility Carried / Feature Intersected
Salisbury Street Over Mississippi River
Location
St. Louis and Venice: St. Louis City, Missouri and Madison County, Illinois: United States
Structure Type
Metal 18 Panel Multiple-Type-Connected Pennsylvania Through Truss, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
1910 By Builder/Contractor: Pennsylvania Steel Company of Steelton, Pennsylvania and Engineer/Design: Ralph Modjeski

Technical Facts

Rehabilitation Date
2005
Main Span Length
517.5 Feet (157.73 Meters)
Structure Length
5733.5 Feet (1747.57 Meters)
Roadway Width
24 Feet (7.32 Meters)
Spans
3 Main Span(s) and 31 Approach Span(s)
NBI Number
32776

Historic Significance Rating (HSR)

Bridge Documentation

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

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This bridge is a massive through truss. It was designed by famous engineer Ralph Modjeski and is among the earlier of his surviving bridges. The bridge was originally designed to handle railroad traffic, but today only serves vehicular traffic plus a bicycle path. Not part of the original design, there are extra decks cantilevered outside of the truss lines on each side. Although both appear capable of handling a single lane of highway traffic, the south outer deck is now used for the bicycle path, while the other side is closed but appears to be intended for use for detours when the main two lanes between the truss lines are closed for repair. The approach spans for this bridge are all two lanes only, with the cantilevered lanes on the truss ending after the truss spans.

The original approach viaduct for this bridge has been demolished and replaced, with the exception of a section of railroad viaduct which was converted for use on the bike path. The original approach included large deck truss spans that were replaced with steel stringer spans. Historical photos below show the original design and layout of the bridge.

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