M-66 over Quaker Brook
Barry County, Michigan · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- M-66 over Quaker Brook in Barry County, Michigan, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2019, making it 6 years old at the 2025 inventory.
- It carries about 6,083 vehicles a day (traffic count year 2015).
- Its listed owner is the state highway agency.
- It is one of 19 of the 69 inventoried bridges in Barry County rated good (27.5%); 15 (21.7%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (good), but component ratings moved: superstructure 9 to 8.
- Its most recent inspection on record is dated March 2025, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (42.60018, -85.09366)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 9 | 8 | Very good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 44 ft |
| Location | In Village of Nashville |
| NBI structure number | 000000000000544 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 2025 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Barry County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| M-43 over Thornapple River | 1963 | 12,750 | Fair |
| M-37 over Duncan Creek | 1957 | 10,700 | Fair |
| Main Street over Thornapple River | 2015 | 8,000 | Good |
| Michigan Ave over Thornapple River | 2012 | 7,215 | Good |
| M-66 over Thornapple River | 1999 | 6,177 | Fair |
| M-66 over Quaker Brook | 1940 | 4,450 | Fair |
All bridges nearby: Barry County, MI bridge conditions · every bridge in Barry County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.