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Keokuk-Hamilton Bridge

Keokuk-Hamilton Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: March 20, 2016

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Key Facts

Facility Carried / Feature Intersected
Railroad (Keokuk Junction Railway) Over Mississippi River
Location
Keokuk and Hamilton: Lee County, Iowa and Hancock County, Illinois: United States
Structure Type
Metal 13 Panel Multiple-Type-Connected Pratt Through Truss, Movable: Swing (Rim Bearing Center Pier) and Approach Spans: Metal 9 Panel Multiple-Type-Connected Pratt Through Truss, Fixed
Construction Date and Builder / Engineer
1917 By Builder/Contractor: Strobel Steel Construction Company of Chicago, Illinois and Engineer/Design: Ralph Modjeski

Technical Facts

Rehabilitation Date
1956
Main Span Length
380 Feet (116 Meters)
Structure Length
3,800 Feet (1,158 Meters)
Roadway Width
18 Feet (5.49 Meters)
Spans
1 Main Span(s) and 10 Approach Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)

Bridge Documentation

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

HAER Data Pages, PDF

Historical Article About Bridge

Built as a double-deck railroad bridge with an upper deck for highway traffic, in 1985 a new highway bridge resulted in the upper deck being abandoned.

The swing span and two of the approach spans are unusual as they have the general appearance and design of through truss spans, but they do not have overhead bracing in the typical sense. With the upper deck passing through them there is no room nor any need for bracing as the deck likely braces the truss.

The bridge is a noted example of a bridge designed by famous engineer Ralph Modjeski.

The west end of the upper deck of this bridge is now an observation platform, so that part of this bridge at least remains open to the public.


This bridge is tagged with the following special condition(s): Double-Deck

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Photo Galleries and Videos: Keokuk-Hamilton Bridge

 
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Maps and Links: Keokuk-Hamilton Bridge

Coordinates (Latitude, Longitude):
40.390900,-91.372550

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