Bridge conditions in O'Brien County, Iowa
263 inventoried bridges · 16 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
O'Brien County tracks close to typical: 16 of its 263 inventoried bridges (6.1%) are rated poor, against a national rate of about 7%.
- 16 of the 263 bridges in O'Brien County, Iowa, are rated in poor condition (6.1%) in the 2025 National Bridge Inventory, as of .
- 128 bridges (48.7%) are rated good and 119 (45.2%) fair.
- The median O'Brien County bridge was built in 1980.
- The busiest poor-rated bridge is FM over Willow Creek (built 1964), carrying about 279 vehicles a day.
Good 48.7% · Fair 45.2% · Poor 6.1% of 263 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 Willow Creek | 1964 | 279 | Poor |
| Local over Ginger Creek | 1952 | 62 | Poor |
| Local over Mill Creek | 1924 | 50 | Poor |
| Local over Grass Waterway | 1954 | 50 | Poor |
| Local over Lamkin Creek | 1945 | 35 | Poor |
| FM over Waterman Creek | 2003 | 34 | Poor |
| Local Sec Rd over Willow CR | 1919 | 26 | Poor |
| Local Sec Rd over Willow Creek | 1935 | 26 | Poor |
| Local over W Br Mill Creek | 1925 | 26 | Poor |
| Local over Floyd River | 1900 | 26 | Poor |
| Local over Barry Creek | 1938 | 21 | Poor |
| Local Sec Rd over Ginger CR | 1900 | 15 | Poor |
| Local over Mill Creek | 1935 | 15 | Poor |
| Local over Willow Creek | 1900 | 11 | Poor |
| Sec Rd over Jordan Creek | 1916 | – | Poor |
| Sec Rd over Waterman CR | 1915 | – | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ia 60 over Engels Creek | 2006 | 5,300 | Good |
| US 18 over Branch Little Floyd Rvr | 1958 | 4,530 | Fair |
| US 18 over Drainage Ditch | 1958 | 4,530 | Fair |
| US 18 over Little Floyd River | 1957 | 4,230 | Fair |
| US 18 over Stream | 1959 | 3,640 | Fair |
| US 18 over Waterman Creek | 2020 | 3,530 | Good |
| US 18 over Stream | 1958 | 3,530 | Fair |
| US 18 over Drainage Ditch | 1957 | 3,210 | Fair |
| Ia 60 SB over Floyd River | 2004 | 2,650 | Good |
| Ia 60 NB over Floyd River | 2004 | 2,650 | 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.