Bridge conditions in Hanson County, South Dakota
62 inventoried bridges · 8 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
About one in 8 bridges in Hanson County is rated in poor condition: 8 of 62 on the federal inventory, one of the higher shares in South Dakota.
- 8 of the 62 bridges in Hanson County, South Dakota, are rated in poor condition (12.9%) in the 2025 National Bridge Inventory, as of .
- 12 bridges (19.4%) are rated good and 42 (67.7%) fair.
- The median Hanson County bridge was built in 1975.
- The busiest poor-rated bridge is 25810 416 Avenue over James Rv (built 1959), carrying about 165 vehicles a day.
Good 19.4% · Fair 67.7% · Poor 12.9% of 62 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 |
|---|---|---|---|
| 25810 416 Avenue over James Rv | 1959 | 165 | Poor |
| 25210 413 Avenue over Rock Ck | 1983 | 70 | Poor |
| 25020 415 Avenue over Rock Ck | 1967 | 60 | Poor |
| 41330 264 Street over Ck | 1982 | 45 | Poor |
| 41440 267 Street over Twelve Mile Ck | 1982 | 45 | Poor |
| 25170 415 Avenue over Ck | 1984 | 40 | Poor |
| 41390 251 Street over Rock Ck | 1963 | 30 | Poor |
| 314TH Ave over Enemy Ck | 2021 | 23 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I090 W over James Rv BNSF RR | 1967 | 7,206 | Fair |
| I090 E over James Rv BNSF RR | 1967 | 7,206 | Fair |
| I090 W over SD038 P | 1965 | 6,685 | Fair |
| I090 E over SD038 P | 1965 | 6,685 | Fair |
| I090 W over 419 Ave | 1965 | 6,685 | Good |
| I090 E over 419 Ave | 1965 | 6,685 | Fair |
| I090 W over Wolf Ck | 1964 | 6,380 | Fair |
| I090 E over Wolf Ck | 1964 | 6,380 | Fair |
| SD262 over I090 | 1965 | 2,478 | Fair |
| SD038 over Johnson Ck | 1991 | 2,372 | 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.