Csah 4 over St Louis River
St. Louis County, Minnesota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Csah 4 over St Louis River in St. Louis 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 1982, making it 43 years old at the 2025 inventory.
- It carries about 1,450 vehicles a day (traffic count year 2019).
- Its listed owner is the county highway agency.
- It is one of 285 of the 670 inventoried bridges in St. Louis County rated fair (42.5%); 41 (6.1%) 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 May 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 → (47.43328, -92.32215)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 197 ft |
| Location | 1.0 Mi SE of Jct Csah 10 |
| NBI structure number | 69518 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Minnesota department of transportation.
Busiest bridges in St. Louis County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 35 over Miller & Coffee Creek | 2022 | 46,000 | Good |
| I 35 over Unstable Material | 1970 | 45,454 | Fair |
| I 35 over Recycle Way | 2011 | 38,802 | Good |
| I 35 over I 35 NB Off Ramp | 1965 | 35,500 | Fair |
| I 35 over Abandoned City St | 1969 | 35,500 | Fair |
| I 535 over SB Garfield; BNSF RR | 1969 | 28,098 | Fair |
All bridges nearby: St. Louis County, MN bridge conditions · every bridge in St. Louis County · Minnesota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.