Mn 56 over I 90
Mower County, Minnesota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Mn 56 over I 90 in Mower County, Minnesota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1959, making it 66 years old at the 2025 inventory.
- It carries about 2,900 vehicles a day (traffic count year 2018).
- Its listed owner is the state highway agency.
- It is one of 162 of the 343 inventoried bridges in Mower County rated fair (47.2%); 28 (8.2%) 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 August 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 → (43.67148, -92.86923)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 201 ft |
| Location | at Jct Th 56 |
| NBI structure number | 9505 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2023 |
| 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 Minnesota department of transportation.
Busiest bridges in Mower County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Con 2589 over I 90 | 2010 | 27,200 | Good |
| I 90 over Dobbins Creek | 2009 | 18,300 | Good |
| I 90 over Rose Creek | 1959 | 13,166 | Poor |
| I 90 over Rose Creek | 1959 | 13,166 | Fair |
| I 90 EB over Cedar River | 2024 | 11,649 | Good |
| I 90 over Cedar River | 1958 | 11,649 | Fair |
All bridges nearby: Mower County, MN bridge conditions · every bridge in Mower County · Minnesota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.