Bridge conditions in Union County, Iowa
172 inventoried bridges · 55 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Union County has 55 bridges rated poor out of 172 inventoried, a 32.0% share that puts it well above the national rate of about 7%.
- 55 of the 172 bridges in Union County, Iowa, are rated in poor condition (32.0%) in the 2025 National Bridge Inventory, as of .
- 53 bridges (30.8%) are rated good and 64 (37.2%) fair.
- The median Union County bridge was built in 1981.
- The busiest poor-rated bridge is Lincoln St over Hurley Creek (built 1973), carrying about 875 vehicles a day.
Good 30.8% · Fair 37.2% · Poor 32.0% of 172 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 34 over Br. East Platte River | 1971 | 4,890 | Fair |
| US 34 over over BNSF RR | 1971 | 4,890 | Fair |
| US 34 over Twelve Mile Creek | 1971 | 4,890 | Fair |
| US 34 over Twelve Mile Creek | 1971 | 4,890 | Fair |
| Ia 25 over Stream | 1976 | 4,870 | Fair |
| US 169 over BNSF RR | 1980 | 3,870 | Good |
| US 34 & Ia 25 over Branch Platte River | 1973 | 3,730 | Fair |
| US 34 & 169 over over UP Rr(aband) | 1971 | 3,450 | Fair |
| US 34 & 169 over Grand River | 1971 | 3,450 | Fair |
| US 34 over Four Mile Creek | 1971 | 3,040 | 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 Union County → - all 172, 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.