F4001 FH10 over Au Sable River
Alcona County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- F4001 FH10 over Au Sable River in Alcona 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 1970, making it 55 years old at the 2025 inventory.
- It carries about 307 vehicles a day (traffic count year 2003).
- Its listed owner is the county highway agency.
- It is one of 9 of the 27 inventoried bridges in Alcona County rated fair (33.3%); 5 (18.5%) 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 May 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 → (44.61276, -83.83655)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 194 ft |
| Location | 5 Mi W 4 Mi N of Glennie |
| NBI structure number | 000000000000019 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2023 |
| 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 Alcona County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-23 over Black River | 1935 | 4,714 | Fair |
| County Hwy F41 over Van Etten Creek | 1956 | 2,770 | Fair |
| County Hwy F41 over Van Etten Creek | 1956 | 2,770 | Fair |
| County Hwy F41 over Pine River | 1956 | 2,250 | Fair |
| Hurbert Road over Thunder Bay River | 1955 | 1,730 | Poor |
| Mikado Glennie Rd over Pine River | 1995 | 1,450 | Fair |
All bridges nearby: Alcona County, MI bridge conditions · every bridge in Alcona County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.