Bridge conditions in Lyon County, Minnesota
234 inventoried bridges · 6 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 234 bridges in Lyon County: 177 rated good, 51 fair, and 6 poor.
- 6 of the 234 bridges in Lyon County, Minnesota, are rated in poor condition (2.6%) in the 2025 National Bridge Inventory, as of .
- 177 bridges (75.6%) are rated good and 51 (21.8%) fair.
- The median Lyon County bridge was built in 1985.
- The busiest poor-rated bridge is Csah 11 over Stream (built 1938), carrying about 517 vehicles a day.
Good 75.6% · Fair 21.8% · Poor 2.6% of 234 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 |
|---|---|---|---|
| Csah 11 over Stream | 1938 | 517 | Poor |
| M 5 over Redwood River | 1976 | 60 | Poor |
| T 112 over S Br Yellow Medicine R | 1966 | 51 | Poor |
| CR 69 over Big Cottonwood River | 1959 | 36 | Poor |
| M 20 over S Br Yellow Medicine R | 1925 | 25 | Poor |
| T 263 over Redwood River | 1969 | 24 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 59 over Redwood River | 1950 | 9,500 | Fair |
| Mn 19 over Redwood River | 1931 | 8,800 | Fair |
| Mn 19 over Redwood River | 1975 | 8,300 | Fair |
| Mn 23 over Ditch | 1999 | 5,910 | Good |
| Mn 23 over Redwood River | 1973 | 5,204 | Fair |
| US 59 over Redwood R Diversion Chan | 1962 | 5,200 | Fair |
| Mn 23 over Three Mile Creek | 1973 | 4,677 | Fair |
| Csah 33 over BNSF RR | 1983 | 4,014 | Fair |
| Csah 33 over Redwood River | 1983 | 4,014 | Good |
| Mn 68 over Redwood R Diversion Chan | 1962 | 3,810 | 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.