Bridge conditions in Adair County, Iowa
303 inventoried bridges · 37 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Adair County has 37 bridges rated poor out of 303 inventoried, a 12.2% share that puts it well above the national rate of about 7%.
- 37 of the 303 bridges in Adair County, Iowa, are rated in poor condition (12.2%) in the 2025 National Bridge Inventory, as of .
- 145 bridges (47.9%) are rated good and 121 (39.9%) fair.
- The median Adair County bridge was built in 1997.
- The busiest poor-rated bridge is 3RD St over over Abandon RR (built 1900), carrying about 387 vehicles a day.
Good 47.9% · Fair 39.9% · Poor 12.2% of 303 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 |
|---|---|---|---|
| I-80 over Drainage Ditch | 1959 | 27,600 | Fair |
| I-80 over Drainage Ditch | 1959 | 27,600 | Fair |
| I-80 over North River | 1958 | 25,900 | Fair |
| I-80 over Plunger Creek | 1959 | 25,900 | Fair |
| I-80 over Middle River | 1958 | 24,800 | Fair |
| I-80 over Drainage Ditch | 1958 | 24,800 | Fair |
| Ia 25 over Iowa 25 | 1958 | 23,600 | Fair |
| I-80 over Stream | 1958 | 23,300 | Fair |
| I 80 EB over Middle River | 2013 | 12,400 | Good |
| WB I-80 over Middle River | 2011 | 12,400 | 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 Adair County → - all 303, 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.