Bridge conditions in Winnebago County, Iowa
54 inventoried bridges · 16 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Winnebago County has 16 bridges rated poor out of 54 inventoried, a 29.6% share that puts it well above the national rate of about 7%.
- 16 of the 54 bridges in Winnebago County, Iowa, are rated in poor condition (29.6%) in the 2025 National Bridge Inventory, as of .
- 18 bridges (33.3%) are rated good and 20 (37.0%) fair.
- The median Winnebago County bridge was built in 1988.
- The busiest poor-rated bridge is FM over Blue Earth River (built 1924), carrying about 938 vehicles a day.
Good 33.3% · Fair 37.0% · Poor 29.6% of 54 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 |
|---|---|---|---|
| FM over Blue Earth River | 1924 | 938 | Poor |
| Broadway Ave over Winnebago River | 1975 | 245 | Poor |
| Local over Drainage Ditch | 1928 | 82 | Poor |
| Local over Drainage Ditch | 1976 | 72 | Poor |
| Local over Beaver Creek | 1976 | 41 | Poor |
| Local over Drainage Ditch | 1966 | 41 | Poor |
| Local over Beaver Creek | 1985 | 35 | Poor |
| Local over Drainage Ditch | 1950 | 35 | Poor |
| Local over Buffalo Creek | 1975 | 26 | Poor |
| Local over Drainage Ditch | 1985 | 26 | Poor |
| Local over Drainage Ditch | 1964 | 20 | Poor |
| Local over Pike Run | 1976 | 11 | Poor |
| Local over N Buffalo Creek | 1949 | 11 | Poor |
| Local over Pike Run | 1976 | 5 | Poor |
| Local over N Fork Buffalo Creek | 1900 | 5 | Poor |
| Local over N Buffalo Creek | 1949 | 5 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 69 over Winnebago River | 1988 | 5,400 | Fair |
| Secor Ave over Winnebago River | 1966 | 3,200 | Fair |
| US 69 & Ia 9 over Winnebago River | 1988 | 2,960 | Fair |
| Ia 9 over Drainage Ditch | 1975 | 2,320 | Fair |
| US 69 over Lime Creek | 1931 | 1,970 | Fair |
| J St over Winnebago River | 1974 | 1,884 | Fair |
| US 69 over Pike Run Creek | 1968 | 1,650 | Fair |
| Ia 9 over Stream | 1975 | 1,650 | Fair |
| FM over Blue Earth River | 1924 | 938 | Poor |
| FM over Beaver Creek | 1987 | 848 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Iowa: Iowa 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.