Bridge conditions in Dallas County, Iowa
206 inventoried bridges · 18 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
18 of the 206 bridges the federal inventory lists in Dallas County are rated poor; the rest split 96 good and 92 fair.
- 18 of the 206 bridges in Dallas County, Iowa, are rated in poor condition (8.7%) in the 2025 National Bridge Inventory, as of .
- 96 bridges (46.6%) are rated good and 92 (44.7%) fair.
- The median Dallas County bridge was built in 1980.
- The busiest poor-rated bridge is FM over Johnson Creek (built 1933), carrying about 2,628 vehicles a day.
Good 46.6% · Fair 44.7% · Poor 8.7% of 206 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.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| FM over Johnson Creek | 1933 | 2,628 | Poor |
| FM over Sugar Creek | 1933 | 2,628 | Poor |
| F-60 over Panther Creek | 1966 | 1,930 | Poor |
| FM over Stream | 1970 | 1,544 | Poor |
| 15TH St over Butler Creek | 1907 | 1,027 | Poor |
| Thomas St over Middle Racoon River | 1951 | 574 | Poor |
| Warford St over Frog Creek | 1915 | 536 | Poor |
| Local over Bear Creek | 1949 | 180 | Poor |
| Local over North Raccoon River | 1882 | 153 | Poor |
| FM over over Iais RR | 1940 | 150 | Poor |
| Park Rd(sw) over Frog Creek | 1930 | 95 | Poor |
| County Road over Mosquito Creek | 1942 | 72 | Poor |
| County Road over Panther Creek | 1964 | 35 | Poor |
| County Road over Frog Creek | 1937 | 35 | Poor |
| County Road over Branch Mosquito Creek | 1926 | 21 | Poor |
| County Road over Mosquito Creek | 1900 | 21 | Poor |
| Local over Beaver Creek | 1890 | 21 | Poor |
| Local over Jim Creek | 1917 | 20 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-80 over Panther Creek | 1965 | 32,100 | Good |
| I-80 over Bear Creek | 1965 | 29,500 | Good |
| EB I-80 over over UP RR | 1966 | 27,550 | Fair |
| WB I-80 over over UP RR | 1966 | 26,850 | Fair |
| EB I-80 over Sugar Creek | 1966 | 24,500 | Fair |
| WB I-80 over Sugar Creek | 1966 | 24,050 | Fair |
| EB I-80 over South Raccoon River | 1966 | 19,100 | Fair |
| EB I-80 over North Raccoon River | 1966 | 19,100 | Fair |
| WB I-80 over South Raccoon River | 1966 | 18,750 | Fair |
| WB I-80 over North Raccoon River | 1966 | 18,750 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
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.