W 21ST Street over Marne Creek
Yankton County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- W 21ST Street over Marne Creek in Yankton County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 1973 and reconstructed in 1998, making it 52 years old at the 2025 inventory.
- It carries about 6,324 vehicles a day (traffic count year 2022).
- Its listed owner is a city or municipal highway agency.
- It is one of 42 of the 99 inventoried bridges in Yankton County rated good (42.4%); 13 (13.1%) 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 → (42.89065, -97.39752)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Steel culvert |
| Length | about 21 ft |
| Location | W 21ST Street - Yankton |
| NBI structure number | 000000068119192 |
| Condition class | Good |
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 |
| Burleigh Street over Marne Creek | 1989 | 4,996 | Good |
| SD050 over Marne Ck | 1980 | 4,096 | 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.