M-65 over Thunder Bay River
Alpena County, Michigan · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- M-65 over Thunder Bay River in Alpena County, Michigan, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1953, making it 72 years old at the 2025 inventory.
- It carries about 1,861 vehicles a day (traffic count year 2007).
- Its listed owner is the state highway agency.
- It is one of 2 of the 32 inventoried bridges in Alpena County rated poor (6.2%); 2 (6.2%) 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 → (45.1208, -83.72233)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 4 | Poor condition |
| Superstructure | 5 | Fair condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Concrete tee beam |
| Length | about 201 ft |
| Location | 0.5 Mi S of Long Rapids |
| NBI structure number | 000000000000326 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Alpena County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-23 over Thunder Bay River | 1932 | 16,200 | Fair |
| Second Avenue over Thunder Bay River | 1939 | 15,700 | Fair |
| Bagley Street over Thunder Bay River | 2021 | 15,000 | Good |
| US-23 over S Br Devil River | 1936 | 5,537 | Fair |
| US-23 over N Br Devil River | 1933 | 5,537 | Fair |
| M-32 over Bean Creek | 1934 | 5,505 | Fair |
All bridges nearby: Alpena County, MI bridge conditions · every bridge in Alpena County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.