Bridge conditions in Black Hawk County, Iowa
489 inventoried bridges · 25 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 489 bridges in Black Hawk County: 254 rated good, 210 fair, and 25 poor.
- 25 of the 489 bridges in Black Hawk County, Iowa, are rated in poor condition (5.1%) in the 2025 National Bridge Inventory, as of .
- 254 bridges (51.9%) are rated good and 210 (42.9%) fair.
- The median Black Hawk County bridge was built in 1986.
- The busiest poor-rated bridge is E Ridgeway Ave over Dry Run Creek (built 1950), carrying about 8,392 vehicles a day.
Good 51.9% · Fair 42.9% · Poor 5.1% of 489 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 218 over Quarry Lake & Wyth Rd | 1989 | 29,000 | Fair |
| US 218 over Broadway St | 1989 | 23,100 | Fair |
| US 218 over Airport Blvd | 1989 | 23,100 | Fair |
| US 218 over Cedar Rvr & Trail | 1989 | 21,500 | Fair |
| Ia 27 over Br Dry Run Creek | 1993 | 20,900 | Good |
| I 380 NB over Ianr RR Tx St Cedar Rvr | 1983 | 19,950 | Fair |
| I-380 over Stream | 1984 | 17,100 | Good |
| I 380 NB over Mccoy Rd | 1983 | 16,600 | Good |
| I 380 SB over Mccoy Rd | 1983 | 16,600 | Good |
| I 380 NB over Elk Run Creek & Rd | 1983 | 16,600 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
Every bridge in Black Hawk County → - all 489, 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.