Bridge conditions in Calhoun County, Iowa
198 inventoried bridges · 49 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 198 Calhoun County bridges in the federal inventory, 49 carry a poor rating. That 24.7% share is roughly 4x the national average.
- 49 of the 198 bridges in Calhoun County, Iowa, are rated in poor condition (24.7%) in the 2025 National Bridge Inventory, as of .
- 50 bridges (25.3%) are rated good and 99 (50.0%) fair.
- The median Calhoun County bridge was built in 1976.
- The busiest poor-rated bridge is FM over Lake CR. (built 1978), carrying about 359 vehicles a day.
Good 25.3% · Fair 50.0% · Poor 24.7% of 198 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 Lake CR. | 1978 | 359 | Poor |
| Co Rd N-37 over Lake Creek | 1985 | 354 | Poor |
| FM over Dd 261 | 1963 | 300 | Poor |
| FM over Dd 9-13 | 1966 | 290 | Poor |
| Local over Camp Ck | 1973 | 279 | Poor |
| Co Rd over East Cedar Creek | 1968 | 220 | Poor |
| FM over Dd 181 Big Cedar | 1938 | 219 | Poor |
| FM over E Cedar Creek | 1970 | 180 | Poor |
| FM over Cedar Creek | 1971 | 150 | Poor |
| FM over Cain Creek | 1971 | 110 | Poor |
| FM over Cain Creek | 1968 | 110 | Poor |
| FM over Cedar Creek | 1970 | 71 | Poor |
| Local over Lake Ck | 1931 | 60 | Poor |
| FM over Cedar Creek | 1972 | 60 | Poor |
| P13 Valley Ave over Dd #83 | 1917 | 60 | Poor |
| FM over Calhoun Co Dd | 1976 | 45 | Poor |
| Local over D.d. No 20 | 1900 | 40 | Poor |
| Local over Dd 9-13 | 1900 | 40 | Poor |
| Local over Purgatory CR. | 1900 | 34 | Poor |
| FM over Cedar Creek | 1938 | 34 | Poor |
| Local over Prairie Creek | 1980 | 30 | Poor |
| Local over Dd No 83 | 1900 | 30 | Poor |
| FM over Dd | 1973 | 30 | Poor |
| FM over Drainage | 1975 | 26 | Poor |
| Local over Dd 20 | 1948 | 26 | Poor |
| Local over N Fork Camp CR | 1900 | 26 | Poor |
| Local over Dd 1-54 | 1900 | 26 | Poor |
| Local over Dd 12 | 1974 | 26 | Poor |
| 180TH St over Dd 88 | 1900 | 26 | Poor |
| Local over Dd 2 | 1975 | 26 | Poor |
| Local over Dd 37 | 1960 | 26 | Poor |
| FM over E.cedar CR. | 1938 | 20 | Poor |
| Local over Camp CR. | 1900 | 20 | Poor |
| Local over D.d. | 1900 | 20 | Poor |
| Local over Dd 65 | 1929 | 20 | Poor |
| Local over Dd 13 | 1974 | 20 | Poor |
| Local over South Branch Lizard | 1957 | 20 | Poor |
| Local over Lake Creek | 1917 | 20 | Poor |
| Local over Dd. No 31 | 1971 | 15 | Poor |
| Local over D.d. | 1957 | 15 | Poor |
| Local over D.d. No 83 | 1900 | 15 | Poor |
| Local over E Cedar CR. | 1980 | 15 | Poor |
| Local over Big Cedar CR Dd 181 | 1900 | 15 | Poor |
| FM over Dd 82 | 1938 | 11 | Poor |
| Local over Lake Creek W Br | 1900 | 11 | Poor |
| Local over Purgatory CR. | 1971 | 11 | Poor |
| Local over Stream | 1900 | 5 | Poor |
| Local over Drainage Ditch | 1974 | 5 | Poor |
| Local over W Cedar CR. | 1900 | 5 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 20 over East Cedar Creek | 2008 | 7,000 | Good |
| US 20 over Dd 9 & 13 | 2008 | 6,900 | Good |
| US 20 over W Fork Camp Creek | 2010 | 5,900 | Good |
| US 20 over Drainage Ditch No 1 & 54 | 2010 | 5,900 | Good |
| US 20 WB over Cc RR | 2011 | 3,450 | Good |
| US 20 EB over Cc RR | 2010 | 3,450 | Good |
| Ia 7 over over Cc RR | 1974 | 2,560 | Fair |
| US 20 EB over Ia 4 | 2012 | 2,410 | Good |
| US 20 WB over Ia 4 | 2012 | 2,410 | Good |
| Ia 175 over Raccoon River | 1980 | 1,560 | 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.