412TH Avenue over Creek
Day County, South Dakota · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 412TH Avenue over Creek in Day County, South Dakota, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1920, making it 105 years old at the 2025 inventory.
- It carries about 69 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 9 of the 34 inventoried bridges in Day County rated poor (26.5%); 9 (26.5%) 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 → (45.40606, -97.98046)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 4 | Poor condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 22 ft |
| Location | 0.7 S & 4 W of Andover |
| NBI structure number | 000000019000127 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Day County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| 446A Avenue over Blue Dog Lake | 2023 | 852 | Good |
| SD027 over Antelope Ck | 1970 | 428 | Fair |
| SD027 over Ck | 1970 | 428 | Fair |
| 130TH Street over Creek | 1935 | 385 | Fair |
| 130TH Street over Creek | 1930 | 376 | Good |
| 128TH Street over Creek | 2011 | 307 | Good |
All bridges nearby: Day County, SD bridge conditions · every bridge in Day County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.