Mission Road over Ann Arbor Railroad
Isabella County, Michigan · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Mission Road over Ann Arbor Railroad in Isabella 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 2005, making it 20 years old at the 2025 inventory.
- It carries about 9,200 vehicles a day (traffic count year 2004).
- Its listed owner is the county highway agency.
- It is one of 85 of the 183 inventoried bridges in Isabella County rated good (46.4%); 26 (14.2%) 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 June 2024, 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 → (43.56985, -84.76732)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 64 ft |
| Location | 0.1M N SE Cor Sec 27 T14N |
| NBI structure number | 000000000004309 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | June 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Isabella County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Pickard Avenue over Chippewa River | 1979 | 16,211 | Fair |
| M-20 over Chippewa River | 1996 | 10,842 | Good |
| US-127 NB over Little Salt River | 1961 | 10,457 | Fair |
| US-127 SB over Little Salt River | 1961 | 10,457 | Fair |
| Mission Road over North Br Chippewa River | 2008 | 9,019 | Good |
| US-127 NB over Chippewa River | 1961 | 8,658 | Poor |
All bridges nearby: Isabella County, MI bridge conditions · every bridge in Isabella County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.