Csah 18 over Willow River
Aitkin County, Minnesota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Csah 18 over Willow River in Aitkin County, Minnesota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2022, making it 3 years old at the 2025 inventory.
- It carries about 17 vehicles a day (traffic count year 2021).
- Its listed owner is the county highway agency.
- It is one of 50 of the 96 inventoried bridges in Aitkin County rated good (52.1%); 8 (8.3%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (46.82651, -93.4325)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 9 | Excellent condition |
| Substructure | 9 | Excellent condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 150 ft |
| Location | 3.3 Mi W of Jct Csah 10 |
| NBI structure number | 01535 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Minnesota department of transportation.
Busiest bridges in Aitkin County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Mn 210 over Ripple River | 1980 | 8,900 | Fair |
| US 169 over Ripple River | 1929 | 8,300 | Fair |
| US 169 over Ripple River | 1931 | 5,627 | Fair |
| Mn 65 over Sandy River | 2000 | 5,300 | Fair |
| Mn 65 over Minnewawa Creek | 2009 | 5,300 | Good |
| Mn 210 over Rice River | 1984 | 4,732 | Good |
All bridges nearby: Aitkin County, MN bridge conditions · every bridge in Aitkin County · Minnesota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.