Bridge conditions in Mills County, Iowa
184 inventoried bridges · 35 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 184 Mills County bridges in the federal inventory, 35 carry a poor rating. That 19.0% share is roughly 3x the national average.
- 35 of the 184 bridges in Mills County, Iowa, are rated in poor condition (19.0%) in the 2025 National Bridge Inventory, as of .
- 54 bridges (29.3%) are rated good and 95 (51.6%) fair.
- The median Mills County bridge was built in 1971.
- The busiest poor-rated bridge is Fa-barrus Rd over Pony Creek (built 1969), carrying about 1,524 vehicles a day.
Good 29.3% · Fair 51.6% · Poor 19.0% of 184 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-29 over Fulsom Lake Outlet | 2010 | 19,700 | Good |
| NB I-29 over St Marys Creek | 2009 | 9,850 | Good |
| SB I-29 over St Marys Creek | 2009 | 9,850 | Good |
| Locust Street over Tinkle Branch | 1976 | 8,957 | Fair |
| US 34 over Missouri River | 2014 | 7,100 | Good |
| NB I-29 over Drainage Ditch | 2009 | 6,850 | Good |
| SB I-29 over Drainage Ditch | 2009 | 6,850 | Good |
| NB I-29 over Haynie Slough | 1971 | 6,850 | Fair |
| SB I-29 over Haynie Slough | 1971 | 6,850 | Fair |
| NB I-29 over Keg Creek | 1971 | 6,850 | 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 Mills County → - all 184, 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.