I 35 over Portage River
Carlton County, Minnesota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I 35 over Portage River in Carlton County, Minnesota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1968, making it 57 years old at the 2025 inventory.
- It carries about 16,400 vehicles a day (traffic count year 2016).
- Its listed owner is the state highway agency.
- It is one of 63 of the 148 inventoried bridges in Carlton County rated fair (42.6%); 13 (8.8%) are rated poor.
- 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 → (46.44972, -92.73277)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 26 ft |
| Location | 1.1 Mi N of Jct Th 73 |
| NBI structure number | 09810 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Minnesota department of transportation.
Busiest bridges in Carlton County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Mn 33 over I 35 | 1965 | 16,100 | Fair |
| I 35 over St Louis River | 1971 | 14,250 | Fair |
| I 35 over St Louis River | 1971 | 14,250 | Fair |
| I 35 over Korby Road | 1973 | 14,250 | Good |
| I 35 over Korby Road | 1973 | 14,250 | Good |
| I 35 over Midway River | 1971 | 14,250 | Good |
All bridges nearby: Carlton County, MN bridge conditions · every bridge in Carlton County · Minnesota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.