Bridge conditions in Dickinson County, Iowa
83 inventoried bridges · 13 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 83 Dickinson County bridges in the federal inventory, 13 carry a poor rating. That 15.7% share is roughly 2x the national average.
- 13 of the 83 bridges in Dickinson County, Iowa, are rated in poor condition (15.7%) in the 2025 National Bridge Inventory, as of .
- 37 bridges (44.6%) are rated good and 33 (39.8%) fair.
- The median Dickinson County bridge was built in 1979.
- The busiest poor-rated bridge is Ia 9 over W Fork Little Sioux Rvr (built 1929), carrying about 4,310 vehicles a day.
Good 44.6% · Fair 39.8% · Poor 15.7% of 83 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 |
|---|---|---|---|
| Ia 9 over W Fork Little Sioux Rvr | 1929 | 4,310 | Poor |
| FM over Creek | 1941 | 2,060 | Poor |
| FM over Little Sioux River | 1979 | 1,076 | Poor |
| FM over Dugout Creek | 1970 | 843 | Poor |
| N14 (310TH Ave) over Drainage Ditch | 1948 | 803 | Poor |
| FM over Little Sioux | 1969 | 319 | Poor |
| FM over Stony Creek | 1990 | 315 | Poor |
| FM A-31 over Drainage Ditch | 1994 | 305 | Poor |
| FM over W Br Little Sioux | 1977 | 61 | Poor |
| 270TH St over Creek | 1926 | 41 | Poor |
| Local over Little Sioux | 1920 | 31 | Poor |
| Local over Stony Creek | 1946 | 11 | Poor |
| 270TH St over Drainage Ditch | 1926 | 5 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 71 over E to W Okoboji Lkes Conn | 1999 | 14,600 | Good |
| Ia 9 over Inlet W Okoboji Lake | 1971 | 8,500 | Fair |
| US 71 & Ia 9 over East Okoboji Lake | 1939 | 8,200 | Fair |
| US 71 & Ia 9 over Dry Run Creek | 1978 | 5,400 | Good |
| Ia 9 over W Fork Little Sioux Rvr | 1929 | 4,310 | Poor |
| Ia 9 over Little Sioux River | 1971 | 4,310 | Good |
| FM over Lake Channel | 2006 | 4,040 | Good |
| 220TH St over Stream | 1952 | 2,834 | Fair |
| South Market St over W Br Little Sioux River | 1967 | 2,277 | Fair |
| FM over Creek | 1941 | 2,060 | Poor |
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.