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| Key Facts |
| Bridge Name | Facility Carried / Feature Intersected | Location | Structure Type | Construction Date and Builder/Engineer | |
|---|---|---|---|---|---|
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7 Mile Road Bridge
| 7 Mile Road Over Salt River | Sanford: Midland County, Michigan | Concrete 90 Foot Plan Curved Chord Through Girder, Fixed | 1927 By Builder/Contractor: Unknown and Engineer/Design: Michigan State Highway Department |
| Technical Facts |
| Main Span Length | Structure Length | Roadway Width | Main Spans | NBI Number |
| 90 Feet (27.4 Meters) | 92 Feet (28 Meters) | 22 Feet (6.7 Meters) | 1 | 56200060000B020 |
The 7 Mile Road Bridge is located less than a mile from another curved chord through girder, the Irish Street Bridge. Even more odd, is that the Irish Street Bridge is, like this bridge, a 90 foot plan concrete camelback bridge, which is the largest style of this bridge type. It is rare to find two camelbacks of any size so close together. There were once four historic bridges in this one mile area when you include the Sanford Railroad Bridge which is also in this area, as well as the North Saginaw Road Bridge that was moved. The 7 Mile Road Bridge was beautifully restored representing a major benchmark for other counties to follow. Concrete camelback bridges are very rare structures, and beautiful as well, but are not currently receiving the attention they deserve.
As little attention as truss bridges get, concrete curved chord through girder bridges, commonly called concrete camelbacks, are just as deserving of attention. They are unique to Michigan and are found in no other state. Michigan had around 45 left in 1995, and probably has a lot less today. As a result, each remaining example is nationally significant. Despite this, they are commonly demolished due to their narrow two lane widths. Midland County however, acted sensibly to preserve its transportation heritage, and chose to restore this bridge instead. They probably considered that while 7 Mile Road is a well-traveled road, it does not carry tons of heavy, constant traffic, as well as the fact that people should not be going very fast when the cross this bridge, due to a nearby intersection and a curve. The width of this bridge is very appropriate for the road. Midland County did a good job restoring this bridge, as they patched sections that had deteriorated with concrete. As they did this, they made an effort to preserve its historic integrity by ensuring that their patch jobs conformed to the original shape of the bridge. They finalized the restoration with a protective layer of white concrete paint on the girders of the bridge. This will protect the bridge, and also blends the patched areas in with the rest of the bridge. Midland County deserves to be thanked for saving this bridge!
It is too bad that a plaque does not survive on the bridge. Michigan Historic Bridge Inventory gave a 1927 construction date for the bridge.
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