M-66 over N Br Chippewa River
Mecosta County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- M-66 over N Br Chippewa River in Mecosta 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 1927 and reconstructed in 1999, making it 98 years old at the 2025 inventory.
- It carries about 2,357 vehicles a day (traffic count year 2007).
- Its listed owner is the state highway agency.
- It is one of 47 of the 80 inventoried bridges in Mecosta County rated fair (58.8%); 3 (3.8%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: superstructure 7 to 6, substructure 5 to 6.
- Its most recent inspection on record is dated August 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 → (43.75367, -85.14761)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 6 | Satisfactory condition |
| Substructure | 5 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 80 ft |
| Location | In Barryton |
| NBI structure number | 000000000006754 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2024 |
| 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 Mecosta County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-131 SB over 3 Mile Road | 1979 | 20,300 | Good |
| US-131 NB over 3 Mile Road | 1979 | 20,300 | Fair |
| US-131 SB over Little Muskegon River | 1979 | 20,200 | Fair |
| US-131 NB over Little Muskegon River | 1979 | 20,200 | Fair |
| US-131 SB over Muskegon River | 1983 | 18,000 | Fair |
| US-131 NB over Muskegon River | 1982 | 18,000 | Fair |
All bridges nearby: Mecosta County, MI bridge conditions · every bridge in Mecosta County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.