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| Key Facts |
| Bridge Name | Facility Carried / Feature Intersected | Location | Structure Type | Construction Date and Builder/Engineer | |
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Alec Johnson Road Bridge
Johnson Road Bridge | Alec Johnson Road (Johnson Road) Over Whitefish River | Rural: Alger County, Michigan | Metal 3 Panel Rivet-Connected Pratt Half-Hip Pony Truss, Fixed | 1910 By Builder/Contractor: Unknown |
| Technical Facts |
| Main Span Length | Structure Length | Roadway Width | Main Spans | NBI Number |
| 40 Feet (12.2 Meters) | 42 Feet (12.8 Meters) | 16 Feet (4.9 Meters) | 1 | 02304A00006B010 |
This bridge is a small three panel Pratt half-hip pony truss that appears to retain good historic integrity. Original channel railings are present on the bridge. A fairly recent, yet historically accurate traditional wooden deck with running boards is present on the bridge. The bridge is supported by caissons. Given that another bridge in the county was built by Joliet Bridge and Iron Company, and given that the design of the bridge resembles other Joliet bridges elsewhere in the state, this bridge may also be the work of the Joliet Bridge and Iron Company, although there is no factual evidence at this time. Another issue with this bridge is with the construction date. A 1910 date is listed in the National Bridge Inventory. However some the metal on the bridge has the name "Jones and Laughlins." After around 1905, Jones and Laughlins dropped the "s" from their name. As such, this either indicates that the construction date for this bridge is incorrect, or that the metal on the bridge was already five years old or more when the bridge was built. The latter is possible, since many bridge builders likely stockpiled commonly used iron and steel and may have not used it all immediately.
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Bridge Photo-Documentation
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Westbound Crossing Full Motion Video |
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Eastbound Crossing Full Motion Video |
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