I 90 over Rock River
Rock County, Minnesota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I 90 over Rock River in Rock County, Minnesota, 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 1965, making it 60 years old at the 2025 inventory.
- It carries about 5,696 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 44 of the 266 inventoried bridges in Rock County rated fair (16.5%); 5 (1.9%) 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 2024, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- 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 → (43.63828, -96.19891)
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 193 ft |
| Location | 0.8 Mi E of Jct TH75 |
| NBI structure number | 67805 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Minnesota department of transportation.
Busiest bridges in Rock County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 90 over Spring Water Creek | 1960 | 15,110 | Fair |
| I 90 over Elk Creek | 1964 | 11,392 | Fair |
| I 90 over Beaver Creek | 1960 | 11,300 | Fair |
| I 90 over Beaver Creek | 1971 | 11,300 | Fair |
| I 90 over Stream | 1964 | 9,344 | Good |
| US 75 over I 90 | 1992 | 9,172 | Fair |
All bridges nearby: Rock County, MN bridge conditions · every bridge in Rock County · Minnesota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.