Csah 4 over Rum River
Mille Lacs County, Minnesota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Csah 4 over Rum River in Mille Lacs 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 1980, making it 45 years old at the 2025 inventory.
- It carries about 810 vehicles a day (traffic count year 2018).
- Its listed owner is the county highway agency.
- It is one of 46 of the 107 inventoried bridges in Mille Lacs County rated fair (43.0%); 8 (7.5%) 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 July 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 → (45.7021, -93.58521)
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 | Prestressed concrete stringer or multi-beam girder |
| Length | about 279 ft |
| Location | 0.2 Mi N of Jct Csah 8 |
| NBI structure number | 48522 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2023 |
| 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 Mille Lacs County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Csah 29 over W Br Rum River | 2010 | 10,400 | Good |
| Mn 95 over US 169 | 1979 | 10,100 | Fair |
| Mn 95 over Battle Brook | 1956 | 10,100 | Fair |
| US 169 over Bradbury Brook | 1990 | 9,915 | Fair |
| US 169 over W Br Rum River | 1978 | 9,650 | Fair |
| US 169 over W Br Rum River | 1978 | 9,650 | Fair |
All bridges nearby: Mille Lacs County, MN bridge conditions · every bridge in Mille Lacs County · Minnesota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.