Bridge conditions in Big Stone County, Minnesota
17 inventoried bridges · 1 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 17 bridges in Big Stone County: 10 rated good, 6 fair, and 1 poor.
- 1 of the 17 bridges in Big Stone County, Minnesota, are rated in poor condition (5.9%) in the 2025 National Bridge Inventory, as of .
- 10 bridges (58.8%) are rated good and 6 (35.3%) fair.
- The median Big Stone County bridge was built in 1992.
- The busiest poor-rated bridge is T 149 over Five Mile Creek (built 1968), carrying about 10 vehicles a day.
Good 58.8% · Fair 35.3% · Poor 5.9% of 17 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 |
|---|---|---|---|
| T 149 over Five Mile Creek | 1968 | 10 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 12 over Minnesota River | 2012 | 4,366 | Fair |
| US 75 over Stony Run | 1932 | 1,527 | Fair |
| Csah 30 over Minnesota River | 2007 | 1,400 | Good |
| US 12 over Stony Run | 2021 | 1,250 | Good |
| Mn 7 over Five Mile Creek | 1934 | 1,137 | Fair |
| Mn 28 over Co Ditch # 10 | 1978 | 1,035 | Fair |
| US 75 over BNSF Rail | 1992 | 590 | Good |
| US 12 over Ditch | 2021 | 544 | Good |
| Csah 18 over E Toqua Lake Outlet | 2002 | 170 | Good |
| Mn 7 over Stream | 1965 | 166 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Minnesota: Minnesota 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.