Bridge conditions in Mitchell County, Iowa
167 inventoried bridges · 16 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
16 of the 167 bridges the federal inventory lists in Mitchell County are rated poor; the rest split 81 good and 70 fair.
- 16 of the 167 bridges in Mitchell County, Iowa, are rated in poor condition (9.6%) in the 2025 National Bridge Inventory, as of .
- 81 bridges (48.5%) are rated good and 70 (41.9%) fair.
- The median Mitchell County bridge was built in 1980.
- The busiest poor-rated bridge is Lancer Ave over Small Natural Stream (built 1925), carrying about 1,011 vehicles a day.
Good 48.5% · Fair 41.9% · Poor 9.6% of 167 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 |
|---|---|---|---|
| Lancer Ave over Small Natural Stream | 1925 | 1,011 | Poor |
| Walnut Ave over Wapsipinicon River | 1940 | 462 | Poor |
| 430TH over Creek | 1953 | 403 | Poor |
| 320TH over Fish Creek | 1965 | 226 | Poor |
| 320TH over Little Cedar River | 1931 | 226 | Poor |
| 390TH over Rock Creek | 1973 | 216 | Poor |
| 480TH over Small Stream | 1984 | 216 | Poor |
| Lawrence St over Drainage | 1950 | 167 | Poor |
| Rampart Ave over Small Stream | 1974 | 59 | Poor |
| 440TH over Deer Creek | 1950 | 59 | Poor |
| Primrose Ave over Little Cedar River | 1908 | 33 | Poor |
| 400TH over Beaver Creek | 1915 | 29 | Poor |
| Timber Ave over Wapsipinicon River | 1959 | 29 | Poor |
| Primrose Ave over Creek | 1950 | 20 | Poor |
| 420TH over Burr Oak Creek | 1966 | 15 | Poor |
| Valley Ave over Creek | 1960 | 11 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ia 9 over Cedar River | 1992 | 2,990 | Good |
| Ia 9 over Sugar Creek | 2013 | 2,990 | Good |
| US 218 over Turtle Creek | 1987 | 2,530 | Good |
| US 218 over Stream | 1986 | 2,530 | Good |
| US 218 over Stream | 1967 | 2,530 | Good |
| US 218 over Otter Creek | 1970 | 2,530 | Fair |
| US 218 & Ia 9 over Spring Creek | 1975 | 2,460 | Fair |
| US 218 & Ia 9 over Spring Creek | 1967 | 2,460 | Fair |
| Ia 9 over Rock Creek | 1992 | 2,340 | Good |
| US 218 over Stream | 1979 | 2,260 | Good |
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.