CR 145 over Rat Root River
Koochiching County, Minnesota · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- CR 145 over Rat Root River in Koochiching County, Minnesota, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1963, making it 62 years old at the 2025 inventory.
- It carries about 44 vehicles a day (traffic count year 2021).
- Its listed owner is the county highway agency.
- It is one of 6 of the 98 inventoried bridges in Koochiching County rated poor (6.1%); 6 (6.1%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its class is unchanged from 2024 (poor), but component ratings moved: superstructure 7 to 6, substructure 4 to 3.
- Its most recent inspection on record is dated September 2024, on a 12-month routine inspection cycle.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (48.49145, -93.37419)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 7 | 6 | Satisfactory condition |
| Substructure | 4 | 3 | Serious condition |
Bridge details
| Structure | Timber stringer or multi-beam girder |
| Length | about 94 ft |
| Location | 0.9 Mi W of Jct Th 53 |
| NBI structure number | 36503 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | September 2024 |
| Inspection interval (item 91) | 12 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 Koochiching County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Mn 11 over Stream | 1949 | 5,227 | Fair |
| Mn 11 over Dwp RR | 2018 | 3,565 | Good |
| US 53 over Rat Root River | 1976 | 2,833 | Fair |
| Mn 11 over Jack Fish Bay | 2012 | 2,016 | Good |
| Mn 11 over Tilson Creek | 2012 | 2,016 | Good |
| US 53 over E Br Rat Root River | 1964 | 1,733 | Good |
All bridges nearby: Koochiching County, MN bridge conditions · every bridge in Koochiching County · Minnesota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.