M 75 over Rock River Overflow
Rock County, Minnesota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- M 75 over Rock River Overflow in Rock County, Minnesota, 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 297 vehicles a day (traffic count year 2022).
- Its listed owner is a city or municipal highway agency.
- It is one of 217 of the 266 inventoried bridges in Rock County rated good (81.6%); 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 November 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 → (43.64732, -96.19405)
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 | Continuous concrete slab |
| Length | about 74 ft |
| Location | .6 Mi S of Jct Csah 4 |
| NBI structure number | 67551 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | November 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
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.