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Bridge conditions in Clayton County, Iowa

257 inventoried bridges · 38 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

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 August 20, 2026.
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.

Every bridge in Clayton County → - all 257, 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.