30430 446TH Avenue over Unnamed Creek
Yankton County, South Dakota · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 30430 446TH Avenue over Unnamed Creek in Yankton County, South Dakota, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1941, making it 84 years old at the 2025 inventory.
- It carries about 100 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 13 of the 99 inventoried bridges in Yankton County rated poor (13.1%); 13 (13.1%) are rated poor.
- 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 → (42.97589, -97.27893)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 3 | Serious condition |
| Superstructure | 4 | Poor condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 53 ft |
| Location | 1.7N & 5W of Volin |
| NBI structure number | 000000068180133 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Yankton County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US081 over Marne Ck | 1959 | 16,870 | Fair |
| SD050 over Marne Ck | 1971 | 9,753 | Fair |
| US081 over Missouri Rv | 2007 | 7,755 | Fair |
| SD052 over Ck | 1988 | 6,711 | Fair |
| W 21ST Street over Marne Creek | 1973 | 6,324 | Good |
| Burleigh Street over Marne Creek | 1989 | 4,996 | Good |
All bridges nearby: Yankton County, SD bridge conditions · every bridge in Yankton County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.