M-55 over Au Gres River
Ogemaw County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- M-55 over Au Gres River in Ogemaw County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1929 and reconstructed in 1992, making it 96 years old at the 2025 inventory.
- It carries about 3,875 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 23 of the 31 inventoried bridges in Ogemaw County rated fair (74.2%); 1 (3.2%) 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 October 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 → (44.27711, -83.90953)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 35 ft |
| Location | 1.4 Mi W of Iosco Co Line |
| NBI structure number | 000000000008416 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 7: scour countermeasures installed |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Ogemaw County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-75 Bl|county 23 over Ogemaw Creek | 1932 | 13,157 | Fair |
| I-75 SB over M-55 | 1972 | 7,700 | Fair |
| I-75 NB over M-55 | 1972 | 7,700 | Fair |
| I-75 NB over Ski Park Rd | 1972 | 7,368 | Fair |
| I-75 SB over Ski Park Rd | 1972 | 7,368 | Fair |
| I-75 SB over I-75 Bl|cook Rd | 1972 | 6,301 | Fair |
All bridges nearby: Ogemaw County, MI bridge conditions · every bridge in Ogemaw County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.