Bridge conditions in Yankton County, South Dakota
99 inventoried bridges · 13 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Yankton County has 13 bridges rated poor out of 99 inventoried, a 13.1% share that puts it well above the national rate of about 7%.
- 13 of the 99 bridges in Yankton County, South Dakota, are rated in poor condition (13.1%) in the 2025 National Bridge Inventory, as of .
- 42 bridges (42.4%) are rated good and 44 (44.4%) fair.
- The median Yankton County bridge was built in 1989.
- The busiest poor-rated bridge is W 23RD Street over Marne Creek (built 1976), carrying about 3,980 vehicles a day.
Good 42.4% · Fair 44.4% · Poor 13.1% of 99 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| W 23RD Street over Marne Creek | 1976 | 3,980 | Poor |
| Cedar Street over Marne Creek | 1978 | 969 | Poor |
| 29280 431ST Avenue over James River | 1959 | 315 | Poor |
| 30430 446TH Avenue over Unnamed Creek | 1941 | 100 | Poor |
| 44930 295 St over Turkey Creek | 1991 | 75 | Poor |
| 44960 296 St over Turkey Creek | 1979 | 75 | Poor |
| 29250 442ND Avenue over Clay Creek | 1930 | 50 | Poor |
| 45170 313 St over Unnamed Creek | 1940 | 45 | Poor |
| 30730 436TH Avenue over Marne Creek | 1935 | 33 | Poor |
| 29690 450 Ave over Turkey Creek | 1987 | 33 | Poor |
| 44660 298TH Street over Trib. to Clay Creek | 1940 | 25 | Poor |
| 43160 307TH Street over Marne Creek | 1930 | 10 | Poor |
| 45190 299 St over Trib. to Turkey Creek | 1940 | 5 | Poor |
Busiest bridges in the 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 |
| SD050 over Marne Ck | 1980 | 4,096 | Good |
| W 23RD Street over Marne Creek | 1976 | 3,980 | Poor |
| W 15TH Street over Marne Creek | 2005 | 3,820 | Fair |
| US081 N over Beaver Ck | 2024 | 3,664 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of South Dakota: South Dakota bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.