Bridge conditions in Hancock County, Iowa
135 inventoried bridges · 27 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Hancock County has 27 bridges rated poor out of 135 inventoried, a 20.0% share that puts it well above the national rate of about 7%.
- 27 of the 135 bridges in Hancock County, Iowa, are rated in poor condition (20.0%) in the 2025 National Bridge Inventory, as of .
- 55 bridges (40.7%) are rated good and 53 (39.3%) fair.
- The median Hancock County bridge was built in 1979.
- The busiest poor-rated bridge is US 69 over Galls Creek (built 1930), carrying about 2,450 vehicles a day.
Good 40.7% · Fair 39.3% · Poor 20.0% of 135 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.
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 18 over E Branch Iowa River | 2002 | 6,500 | Good |
| US 18 over Drainage Ditch | 1958 | 5,200 | Fair |
| US 18 over West Fork Iowa River | 1958 | 5,200 | Fair |
| B-14 over Private Dr | 1972 | 3,502 | Fair |
| US 18 over Boone River | 1959 | 2,980 | Fair |
| US 18 over Branch Boone River | 1959 | 2,980 | Fair |
| US 69 over E Branch Iowa River | 2018 | 2,470 | Fair |
| US 69 over Galls Creek | 1930 | 2,450 | Poor |
| US 69 over Drainage Ditch | 1930 | 2,450 | Fair |
| FM 1870 330TH over Winnebago River | 1963 | 2,192 | Poor |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
Every bridge in Hancock County → - all 135, busiest first, each with its own condition record.
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.