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Seneca Railroad Bridge

Seneca Railroad Bridge

Primary Photographer(s): Tom Winkle

Bridge Documented: August 22, 2010

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Key Facts

Facility Carried / Feature Intersected
Railroad (CSX) Over Illinois River
Location
Seneca: Grundy County, Illinois: United States
Structure Type
Metal 6 Panel Pin-Connected Pratt Through Truss, Movable: Vertical Lift (Tower Drive) and Approach Spans: Metal 6 Panel Pin-Connected Pratt Through Truss, Fixed
Construction Date and Builder / Engineer
1882 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
180 Feet (54.9 Meters)
Structure Length
650 Feet (198.1 Meters)
Roadway Width
Not Available
Spans
1 Main Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)
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Bridge Documentation

This bridge has an unusual history. It reportedly was built in 1882. As originally built all spans were fixed pin-connected Pratt through truss spans. In 1916, a derailment collapsed part of the bridge and at that time two spans were replaced with deck plate girder spans. Later, likely in the 1930s, one of the truss spans was retrofitted with towers and turned into a vertical lift span. The actual lift span is the same fixed truss span, with the towers and connecting beams having simply been added to the existing trusses. The bridge is historically and technologically significant not only for its 19th century pin-connected trusses, but the conversion into a lift span is also historically significant as a notable engineering achievement.

Bridge lengths given above are approximate/estimates.

Above: A historical ca. 1910 photo of the bridge showing it as originally configured.

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Photo Galleries and Videos: Seneca Railroad Bridge

 
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Maps and Links: Seneca Railroad Bridge

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