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Griswold Road Bridge

   


Griswold Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: Spring 2007
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Key Facts

Facility Carried / Feature Intersected
Griswold Road Over Pine River
Location
Rural: St. Clair County, Michigan
Construction Date and Builder / Engineer
1925 By Builder/Contractor: Unknown and Engineer/Design: Michigan State Highway Department

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
84 Feet (25.6 Meters)
Structure Length
90 Feet (27.4 Meters)
Roadway Width
22 Feet (6.7 Meters)
Spans
1 Main Span(s)
NBI Number
77200026000B040

Historic Significance Rating (HSR)

Bridge Documentation

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

Learn about Michigan's Unique Concrete Camelback Bridges

This bridge is in a small valley and you do not see it until you are on top of it, and it is a welcome surprise. It is an example of Michigan's unique curved-chord through girder bridge. Built to the 90 foot plan style, this bridge has the characteristic taller girder than shorter plans. The curved portion of the girders have vertical stripes painted on them all the way across. The reasoning for these strips is unclear, perhaps it is decorative, or it could be some sort of old reflecting paint that has long since faded. The bridge deck appears to have been resurfaced, perhaps when the rest of this section of Griswold Road was redone. The girders of the bridge are a sad sight, however. The concrete is spalling severely in several spots. This is still an interesting bridge, and it is be one tough bridge, because there is no weight limit posted despite this deterioration! The repair of the deck was a nice gesture, but without repairing the beautiful girders, which give the bridge both historic and aesthetic value, there is not much point. Even with these repairs, the bridge continues to deteriorate visually. The bridge should have been restored like the 7 Mile Road Bridge, which included adding concrete to spalled areas, paying attention to the original shape and design of the girder, and also applying a protective paint on the girders.

The Griswold Road Bridge appears to have replaced a metal truss bridge. The remains of steel caissons still sit under the bridge today. In 1925, when this bridge was built, the truss bridge would have been considered anything but historic at that time.

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