Bridge conditions in Walworth County, South Dakota
33 inventoried bridges · 1 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 33 bridges in Walworth County: 11 rated good, 21 fair, and 1 poor.
- 1 of the 33 bridges in Walworth County, South Dakota, are rated in poor condition (3.0%) in the 2025 National Bridge Inventory, as of .
- 11 bridges (33.3%) are rated good and 21 (63.6%) fair.
- The median Walworth County bridge was built in 1965.
- The busiest poor-rated bridge is S. 1ST Avenue over Creek (built 1930), carrying about 183 vehicles a day.
Good 33.3% · Fair 63.6% · Poor 3.0% of 33 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 |
|---|---|---|---|
| S. 1ST Avenue over Creek | 1930 | 183 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US012 over Burlington Northern RR | 1969 | 2,111 | Good |
| US012 over Ck | 1969 | 2,111 | Good |
| Irr US012 over Missouri Rv (oahe Lk) | 1959 | 2,071 | Fair |
| Irr Ar US012 over Burlington Northern RR | 1957 | 2,071 | Fair |
| US012 over Blue Blanket Ck | 1964 | 1,963 | Fair |
| US012 over Ck | 1965 | 1,544 | Fair |
| US012 Wf over Ck | 1965 | 1,374 | Fair |
| US012 over Spring Lk | 1986 | 1,145 | Good |
| US083 over Rieger Ck | 2005 | 885 | Good |
| US083 over Swan Ck | 2005 | 767 | Fair |
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.