US-12 over St Joseph River
Hillsdale County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US-12 over St Joseph River in Hillsdale County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1999, making it 26 years old at the 2025 inventory.
- It carries about 15,669 vehicles a day (traffic count year 2007).
- Its listed owner is the state highway agency.
- It is one of 61 of the 104 inventoried bridges in Hillsdale County rated fair (58.7%); 15 (14.4%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated May 2024, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (41.98277, -84.66431)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 45 ft |
| Location | In Jonesville |
| NBI structure number | 000000000003267 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Hillsdale County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-127 over Beecher Creek | 1991 | 5,142 | Fair |
| US-127 over Bean Creek | 1947 | 5,136 | Fair |
| US-127 over Bean Creek | 1947 | 5,136 | Fair |
| Fayette St over St Joseph River | 2022 | 3,798 | Good |
| US-127 over Blanchard Drain | 1948 | 3,056 | Poor |
| US-127 over Lime Creek | 1946 | 3,056 | Fair |
All bridges nearby: Hillsdale County, MI bridge conditions · every bridge in Hillsdale County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.