Bridge conditions in Clayton County, Iowa
257 inventoried bridges · 38 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Clayton County has 38 bridges rated poor out of 257 inventoried, a 14.8% share that puts it well above the national rate of about 7%.
- 38 of the 257 bridges in Clayton County, Iowa, are rated in poor condition (14.8%) in the 2025 National Bridge Inventory, as of .
- 78 bridges (30.4%) are rated good and 141 (54.9%) fair.
- The median Clayton County bridge was built in 1967.
- The busiest poor-rated bridge is Fleetwood Rd over Bear CR (built 1930), carrying about 589 vehicles a day.
Good 30.4% · Fair 54.9% · Poor 14.8% of 257 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 |
|---|---|---|---|
| Fleetwood Rd over Bear CR | 1930 | 589 | Poor |
| Bridge St over Honey Creek | 1973 | 589 | Poor |
| Grandview Rd over Volga River | 1960 | 491 | Poor |
| 6TH St over Drainage | 1920 | 242 | Poor |
| Mesquite Rd over Peck Creek | 1913 | 113 | Poor |
| Glacier Rd over Stream | 1925 | 79 | Poor |
| Hornet Rd over Bear Creek | 1923 | 73 | Poor |
| Essex Ave over Stream | 1910 | 73 | Poor |
| Kennedy Rd over Stream | 1955 | 62 | Poor |
| Keystone Rd over Stream | 1957 | 62 | Poor |
| Bighorn Rd over Hewett Creek | 1920 | 51 | Poor |
| Coffee Rd over Plum Creek | 1900 | 49 | Poor |
| Chariot Rd over Small Stream | 1956 | 49 | Poor |
| Main St-fox Ave over Honey Creek | 1925 | 47 | Poor |
| Oak St over Nagle Creek | 1915 | 45 | Poor |
| 300TH St over Miners Creek | 1916 | 39 | Poor |
| 318TH St over Cox Creek | 1920 | 30 | Poor |
| 265TH St over Stream | 1925 | 26 | Poor |
| 155TH St over Silver Creek | 1925 | 26 | Poor |
| Hennepin Rd over Elk Creek | 1920 | 25 | Poor |
| June Ave over Small Stream | 1910 | 21 | Poor |
| Kahle Ave over Carlan CR | 1900 | 21 | Poor |
| Harvest Rd over Stream | 1920 | 21 | Poor |
| Delta Ave over Stream | 1905 | 16 | Poor |
| Colony Rd over Wolf Creek | 1916 | 16 | Poor |
| 172ND St over Stream | 1916 | 16 | Poor |
| Essex Rd over Roberts Creek | 1917 | 16 | Poor |
| Echo Ave over Stream | 1920 | 11 | Poor |
| Lantern Ave over Miners Creek | 1912 | 11 | Poor |
| A Ave over Stream | 1900 | 11 | Poor |
| 270TH St over Sm Stream | 1920 | 11 | Poor |
| Dove Ave over Roberts Creek | 1964 | 11 | Poor |
| Lantern Ave over Mill Creek | 1940 | 11 | Poor |
| 300TH St over Branch Nagel Creek | 1935 | 11 | Poor |
| Home Ent (sdb) over Panther Creek | 1920 | 10 | Poor |
| Drumlin Rd over Schneiders Creek | 1914 | 10 | Poor |
| B60-ivory Rd over North Cedar Creek | 1913 | 5 | Poor |
| 310TH St over Miners Creek | 1915 | 4 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 18 over Mississippi River Ia 76 | 1974 | 10,100 | Fair |
| Ia 13 over Roberts Creek | 1979 | 4,900 | Good |
| Bridge St over Turkey River | 1889 | 4,755 | Fair |
| US 18 over Unnamed Creek | 1988 | 4,730 | Fair |
| US 18 & 52 over Branch Roberts Creek | 1967 | 4,140 | Fair |
| US 18 over Bloody Run & Dme RR | 1988 | 4,140 | Fair |
| US 18 & 52 over Natural Stream | 1967 | 3,780 | Good |
| Ia 76 over Bloody Run Creek | 1994 | 3,580 | Good |
| Ia 13 over Dry Run Creek | 1977 | 3,370 | Good |
| US 52 over Turkey River | 1968 | 3,340 | 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.