Mn 4 over Watonwan River
Watonwan County, Minnesota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Mn 4 over Watonwan River in Watonwan County, Minnesota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1941, making it 84 years old at the 2025 inventory.
- It carries about 1,300 vehicles a day (traffic count year 2018).
- Its listed owner is the state highway agency.
- It is one of 49 of the 166 inventoried bridges in Watonwan County rated fair (29.5%); 1 (0.6%) 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 September 2024, 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 → (43.88402, -94.68591)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 117 ft |
| Location | 7.5 Mi S of St James |
| NBI structure number | 5965 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 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 Watonwan County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Mn 60 over UP RR | 1985 | 6,958 | Fair |
| Mn 15 over Th 60 | 1975 | 6,600 | Fair |
| Mn 60 over St James Creek | 1977 | 5,300 | Fair |
| Mn 15 over Csah 9 | 1975 | 5,083 | Fair |
| Mn 15 over Csah 9 | 1975 | 4,350 | Fair |
| Mn 15 over Watonwan River | 1975 | 4,150 | Fair |
All bridges nearby: Watonwan County, MN bridge conditions · every bridge in Watonwan County · Minnesota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.