Structure 4534 · Jackson County, MI
Carries Spring Street over N Br Kalamazoo River, In Concord 100ft So M60.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.
How ratings work24 ft end to end. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a slab bridge.
| State | Michigan |
| County | Jackson |
| Location | In Concord 100ft So M60 |
| Carries | Spring Street |
| Crosses | N Br Kalamazoo River |
| Coordinates | 42.17959, -84.64894 |
| Material | Wood or Timber |
| Design | Slab |
| Total Length | 24.3 ft (7.4 m) |
| Max Span | 23.3 ft (7.1 m) |
| Deck Width | 35.4 ft (10.8 m) |
| Deck Area | 79.9 sq m |
| Main Spans | 1 |
| Year Built | 1980 |
| Avg Daily Traffic | 240 (2002) |
| Truck Traffic | 10% |
| Lanes On Bridge | 2 |
| Last Inspection | June 2023 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 000000000004534 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.