Bridge conditions in Turner County, South Dakota
143 inventoried bridges · 38 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Turner County has 38 bridges rated poor out of 143 inventoried, a 26.6% share that puts it well above the national rate of about 7%.
- 38 of the 143 bridges in Turner County, South Dakota, are rated in poor condition (26.6%) in the 2025 National Bridge Inventory, as of .
- 51 bridges (35.7%) are rated good and 54 (37.8%) fair.
- The median Turner County bridge was built in 1991.
- The busiest poor-rated bridge is 45520 275 St over West Fork Vermillion Rv (built 1952), carrying about 758 vehicles a day.
Good 35.7% · Fair 37.8% · Poor 26.6% of 143 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.
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SD044 over BNSF RR | 1976 | 2,416 | Good |
| SD044 over West Fork Vermillion Rv | 1976 | 2,416 | Fair |
| SD044 over West Fork Vermillion Rv | 1976 | 2,416 | Fair |
| US018 over Vermillion Rv | 2013 | 1,836 | Good |
| US018 over Ck | 2018 | 1,836 | Good |
| SD044 over Ck | 1961 | 1,790 | Good |
| US018 over Hurley Ck | 2019 | 1,775 | Good |
| SD019 over East Fork Vermillion Rv | 1989 | 1,648 | Fair |
| SD019 over Ck | 1999 | 1,648 | Good |
| SD019 over West Fork Vermillion Rv | 1986 | 1,648 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
Every bridge in Turner County → - all 143, busiest first, each with its own condition record.
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.