Mn 78 over US 10
Otter Tail County, Minnesota · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Mn 78 over US 10 in Otter Tail County, Minnesota, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1974, making it 51 years old at the 2025 inventory.
- It carries about 6,500 vehicles a day (traffic count year 2019).
- Its listed owner is the state highway agency.
- 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 → (46.58132, -95.57463)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 5 | Fair condition |
| Substructure | 4 | Poor condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 310 ft |
| Location | at the Jct of Th 78 |
| NBI structure number | 56007 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Minnesota department of transportation.
All bridges nearby: Otter Tail County, MN bridge conditions · Minnesota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.