391 Ave over Ck
Aurora County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 391 Ave over Ck in Aurora County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2021, making it 4 years old at the 2025 inventory.
- It carries about 33 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 25 of the 61 inventoried bridges in Aurora County rated good (41.0%); 7 (11.5%) 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 → (43.75499, -98.38534)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 8 | Very good condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 49 ft |
| Location | 5E and 2.6N Plankinton |
| NBI structure number | 000000002210124 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Aurora County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I090 over Ck | 1965 | 9,890 | Fair |
| I090 W over Platte Ck | 1964 | 4,425 | Fair |
| I090 E over Platte Ck | 1964 | 4,425 | Fair |
| US281 over I090 | 1965 | 1,694 | Fair |
| US281 over Ck | 2007 | 1,434 | Good |
| US281 over West Br Firesteel Ck | 1959 | 1,284 | Fair |
All bridges nearby: Aurora County, SD bridge conditions · every bridge in Aurora County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.