US-23 over Tawas River
Iosco County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US-23 over Tawas River in Iosco 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 1984, making it 41 years old at the 2025 inventory.
- It carries about 15,836 vehicles a day (traffic count year 2007).
- Its listed owner is the state highway agency.
- It is one of 32 of the 47 inventoried bridges in Iosco County rated fair (68.1%); 3 (6.4%) 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 July 2023, 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 → (44.25979, -83.52713)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 68 ft |
| Location | In Tawas City |
| NBI structure number | 000000000004125 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Iosco County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| F 41 over Van Ettan Creek | 1979 | 12,300 | Fair |
| US-23 over Au Sable River | 1972 | 8,367 | Fair |
| M-55|hemlock St over Tawas River | 1950 | 8,047 | Fair |
| M-65 over Hale Creek | 1952 | 6,737 | Fair |
| US-23 over Private Road | 1931 | 5,497 | Fair |
| River Road over Au Sable River | 1963 | 4,920 | Fair |
All bridges nearby: Iosco County, MI bridge conditions · every bridge in Iosco County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.