Prairie Corner Rd over St Joseph River
St. Joseph County, Michigan · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Prairie Corner Rd over St Joseph River in St. Joseph County, Michigan, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1974, making it 51 years old at the 2025 inventory.
- It carries about 466 vehicles a day (traffic count year 2003).
- Its listed owner is the county highway agency.
- It is one of 16 of the 132 inventoried bridges in St. Joseph County rated poor (12.1%); 16 (12.1%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (41.98507, -85.4808)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 3 | Serious condition |
| Superstructure | 3 | Serious condition |
| Substructure | 4 | Poor condition |
Bridge details
| Structure | Timber slab |
| Length | about 155 ft |
| Location | 2.5 Mi SW of Mendon |
| NBI structure number | 000000000010377 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in St. Joseph County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-131 over St Joseph River | 2013 | 9,999 | Good |
| US-131 NB over Rocky River | 1951 | 9,588 | Fair |
| US-131 SB over Rocky River | 1956 | 9,588 | Fair |
| US-131 over White Pigeon River | 1994 | 9,556 | Fair |
| M-60 & US-131 Br over Rocky River | 1966 | 9,299 | Fair |
| M-60 & US-131 Br over Rocky River Race | 1942 | 9,299 | Fair |
All bridges nearby: St. Joseph County, MI bridge conditions · every bridge in St. Joseph County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.