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Ganson Street Bridge

Ganson Street Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 21, 2009

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Key Facts

Facility Carried / Feature Intersected
Ganson Street Over Grand River
Location
Jackson: Jackson County, Michigan: United States
Construction Date and Builder / Engineer
1956 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
39 Feet (12 Meters)
Structure Length
39 Feet (12 Meters)
Roadway Width
46 Feet (14.02 Meters)
Spans
1 Main Span(s)
NBI Number
384345000070B01

Historic Significance Rating (HSR)

Bridge Documentation

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

The bridge retains original and unaltered R4 style railings. It displays the less common R4 railing design which uses metal posts instead of concrete posts.

This bridge is one of the oldest examples of a pre-stressed concrete bridge in Michigan, with a 1956 construction date. Because of this fact, the bridge was highlighted in the most recent update to Michigan's Historic Bridge Inventory and is considered eligible for the National Register of Historic Places.

Pre-stressed concrete was a material and construction method that would go on to become the most common form of bridge construction in the late 20th Century and to the present day. As such, the material has a rather wicked reputation among historic bridge enthusiasts since this form of bridge is what is used to demolish and replace historic bridges.

Interestingly, the bridge's deck and superstructure is listed in "poor" condition in the National Bridge Inventory and evaluated as structurally deficient. This bridge hardly made it past 50 years before gaining this evaluation. This calls into serious question claims made by some states like Pennsylvania who claim that historic truss bridges should be demolished and replaced with modern bridges because the new bridges require less maintenance and will last 100 years. Pre-stressed concrete is not a miracle material, is not an excuse to demolish historic bridges, and  it deteriorates just like any bridge material especially as long as salt is used to deice roads. The Ganson Street Bridge suggests that pre-stressed concrete is far less long-lived than the steel and concrete found in many historic bridges.

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Photo Galleries and Videos: Ganson Street Bridge

 
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Maps and Links: Ganson Street Bridge

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