Usfs Rte 2231 over Sturgeon River
Delta County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Usfs Rte 2231 over Sturgeon River in Delta 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 1948 and reconstructed in 1992, making it 77 years old at the 2025 inventory.
- It carries about 10 vehicles a day (traffic count year 1998).
- It is one of 52 of the 86 inventoried bridges in Delta County rated fair (60.5%); 0 (0.0%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated September 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 → (45.94258, -86.70675)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 65 ft |
| Location | Sec 17 Nahma Twp |
| NBI structure number | 091001000001011 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | September 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Delta County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Us-2|us-41|m-35 over Escanaba River | 2016 | 21,906 | Good |
| Us-2|us-41 over Portage Creek | 1928 | 14,094 | Fair |
| US-2 US-41 over Ford River | 1941 | 13,600 | Fair |
| Us-2|us-41 over Willow Creek | 1979 | 12,255 | Fair |
| US-2 over Tacoosh River | 1990 | 8,505 | Fair |
| US-2 over Rapid River | 1931 | 8,505 | Fair |
All bridges nearby: Delta County, MI bridge conditions · every bridge in Delta County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.