Bridge conditions in Audubon County, Iowa
204 inventoried bridges · 37 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
About one in 6 bridges in Audubon County is rated in poor condition: 37 of 204 on the federal inventory, one of the higher shares in Iowa.
- 37 of the 204 bridges in Audubon County, Iowa, are rated in poor condition (18.1%) in the 2025 National Bridge Inventory, as of .
- 71 bridges (34.8%) are rated good and 96 (47.1%) fair.
- The median Audubon County bridge was built in 1970.
- The busiest poor-rated bridge is Edgerton St over Drainage (built 1960), carrying about 616 vehicles a day.
Good 34.8% · Fair 47.1% · Poor 18.1% of 204 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 71 over Stream | 1983 | 3,700 | Good |
| US 71 over Bluegrass Creek | 2006 | 3,080 | Good |
| US 71 over East Nishnabotna River | 1959 | 2,470 | Fair |
| US 71 over Stream | 1923 | 2,380 | Fair |
| US 71 over Stream | 1961 | 2,380 | Fair |
| US 71 over Stream | 1961 | 2,380 | Fair |
| US 71 over Stream | 1923 | 2,380 | Fair |
| US 71 over East Nishnabotna River | 1979 | 2,380 | Fair |
| US 71 over Bluegrass Creek | 1976 | 2,280 | Fair |
| Washington St over Davids Creek | 1959 | 1,987 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
Every bridge in Audubon County → - all 204, 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.