Blair Road over Bad River Drain
Gratiot County, Michigan · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Blair Road over Bad River Drain in Gratiot County, Michigan, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1978, making it 47 years old at the 2025 inventory.
- It carries about 114 vehicles a day (traffic count year 2004).
- Its listed owner is the county highway agency.
- It is one of 22 of the 167 inventoried bridges in Gratiot County rated poor (13.2%); 22 (13.2%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated fair in the 2024 inventory and is now poor (deck 6 to 5, superstructure 5 to 4).
- Its most recent inspection on record is dated July 2024, on a 12-month routine inspection cycle.
- 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 → (43.25742, -84.50387)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 5 | Fair condition |
| Superstructure | 5 | 4 | Poor condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete tee beam |
| Length | about 36 ft |
| Location | Sec 13-14 North Star Twp |
| NBI structure number | 000000000003233 |
| Condition class | Poor |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Gratiot County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-127 NB over US-127 Br | 1961 | 15,400 | Fair |
| US-127 SB over US-127 Br | 1961 | 15,400 | Fair |
| M-46 & US-127BR over US-127 | 1961 | 11,219 | Poor |
| US-127 NB over Maple River | 1988 | 10,831 | Fair |
| US-127 SB over Maple River | 1955 | 10,831 | Good |
| US-127 Br over Pine River | 1928 | 10,432 | Fair |
All bridges nearby: Gratiot County, MI bridge conditions · every bridge in Gratiot County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.