US-31 over Pine River
Charlevoix County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US-31 over Pine River in Charlevoix County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1949 and reconstructed in 1992, making it 76 years old at the 2025 inventory.
- It carries about 15,321 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 9 of the 18 inventoried bridges in Charlevoix County rated fair (50.0%); 2 (11.1%) are rated poor.
- 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 → (45.31876, -85.25867)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 5 | Fair condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Steel movable bascule |
| Length | about 223 ft |
| Location | In Charlevoix |
| NBI structure number | 000000000001471 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Charlevoix County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-131 over Boyne River | 1947 | 6,736 | Fair |
| M-75|s East St over Boyne River | 1974 | 6,546 | Fair |
| Park Street over Boyne River | 1991 | 5,000 | Fair |
| M-32|water St over S Arm Lake Charlevoix | 1959 | 4,600 | Fair |
| Lake Street over Boyne River | 1959 | 3,000 | Fair |
| M-32|maple St over Deer Creek | 1949 | 2,665 | Fair |
All bridges nearby: Charlevoix County, MI bridge conditions · every bridge in Charlevoix County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.