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Bridge conditions in Madison County, Iowa

225 inventoried bridges · 82 rated poor · 2025 National Bridge Inventory

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

Of the 225 Madison County bridges in the federal inventory, 82 carry a poor rating. That 36.4% share is roughly 5x the national average.

82 of the 225 bridges in Madison County, Iowa, are rated in poor condition (36.4%) in the 2025 National Bridge Inventory, as of August 20, 2026.
38 bridges (16.9%) are rated good and 105 (46.7%) fair.
The median Madison County bridge was built in 1972.
The busiest poor-rated bridge is FM over Br Badger Creek (built 1970), carrying about 1,714 vehicles a day.

Good 16.9% · Fair 46.7% · Poor 36.4% of 225 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 Br Badger Creek	1970	1,714	Poor
FM over Badger Creek	1956	1,404	Poor
FM over Over-flow-north River	1970	880	Poor
FM over Jones Creek	1929	788	Poor
FM over Jim Creek	1948	668	Poor
FM over Drainage	1949	597	Poor
FM over Howerdon Creek	1972	597	Poor
FM over Jim Creek	1972	597	Poor
FM over Tom Creek	1962	597	Poor
FM over Clanton Creek	1932	477	Poor
FM over Howerdon Creek	1954	477	Poor
FM over Tom Creek	1954	477	Poor
FM over Overflow Clanton Creek	1932	450	Poor
FM over Middle River	1932	450	Poor
FM over Field Drainage Ditch	1951	417	Poor
FM over Field Drainage Ditch	1951	417	Poor
FM over Grand River	1940	379	Poor
FM over South River	1936	349	Poor
FM over Middle River	1958	300	Poor
Local Rd over Drainage	1930	219	Poor
FM over Drainage	1975	180	Poor
FM over Drainage	1930	180	Poor
FM over Waterway	1955	159	Poor
FM over Grand River	1957	131	Poor
FM over West Branch	1957	131	Poor
FM over Badger Creek	1955	131	Poor
Local over Drainage	1955	131	Poor
FM over Waterway	1930	100	Poor
FM over North River	1960	100	Poor
Local over Drainage	1940	90	Poor
FM over Drainage	1940	89	Poor
FM over Branch to Clanton Creek	1940	71	Poor
Local over Small Stream	1982	71	Poor
FM over Jim Creek	1931	71	Poor
Local Rd over Drainage	1956	61	Poor
Local Rd over North Clanton Creek	1937	60	Poor
FM over Jones Creek	1953	60	Poor
Local Rd over Small	1976	60	Poor
Local Rd over Drainage	1940	60	Poor
Local Rd over Br to Middle	1942	50	Poor
Local over Drainage	1972	50	Poor
Local Rd over N Br North River	1915	50	Poor
Local over Drainage	1981	45	Poor
Local Rd over Jones Creek	1979	45	Poor
Local Rd over Middle River	1948	45	Poor
Local over Jones Creek	1938	45	Poor
Local over Waterway	1950	41	Poor
FM over Drainage	1930	40	Poor
FM over Drainage	1951	40	Poor
Local Rd over Drainage	1978	40	Poor
Local over Badger Creek	1890	40	Poor
FM over Drainage	1960	40	Poor
Local Rd over S Fork Clanton Creek	1978	34	Poor
Local over Drainage	1939	34	Poor
Local Rd over Jim Creek	1961	34	Poor
Local over Drainage	1945	29	Poor
Local over Jones Creek	1974	29	Poor
Local Rd over Cedar Creek	1952	29	Poor
Local Rd over Tom Creek	1910	29	Poor
Local over Drainage	1948	26	Poor
Local Rd over Cedar Creek	1966	26	Poor
Local Rd over North River	1909	26	Poor
Local over Drainage	1960	26	Poor
Local Rd over Tom Creek	1930	26	Poor
Local Rd over W Br Grand River	1951	20	Poor
FM over Drainage	1941	20	Poor
Local over Drainage	1952	20	Poor
Local over Drainage	1938	20	Poor
Local Rd over Jim Creek	1895	20	Poor
Local over Jim Creek	1981	20	Poor
Local Rd over N Fork Clanton Creek	1900	15	Poor
Local over Drainage	1952	15	Poor
Local Rd over Drainage	1900	15	Poor
Local over Drainage	1952	15	Poor
Local over Drainage	1958	11	Poor
FM over Middle River	1935	11	Poor
Local over Drainage	1965	11	Poor
Local over Drainage	1967	11	Poor
Local Rd over Drainage	1956	11	Poor
Local over Jim Creek	1939	11	Poor
Co Entrance over Drainage	1972	11	Poor
Grandview Trl over N Clanton Creek	1895	5	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I-80 over Drainage Ditch	1959	27,600	Fair
US 169 over Cedar Creek	1990	5,900	Good
US 169 over North River	1969	4,280	Fair
US 169 over N Branch North River	1983	4,280	Fair
US 169 over Stream	1944	4,280	Fair
FM over Middle River	1996	2,091	Fair
US 169 over Clanton Creek	1976	1,890	Good
US 169 over Drainage Ditch	1976	1,890	Fair
US 169 over Middle River	1976	1,890	Fair
FM over Stream	1936	1,714	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.