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Bridge conditions in Iowa County, Iowa

239 inventoried bridges · 45 rated poor · 2025 National Bridge Inventory

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

About one in 5 bridges in Iowa County is rated in poor condition: 45 of 239 on the federal inventory, one of the higher shares in Iowa.

45 of the 239 bridges in Iowa County, Iowa, are rated in poor condition (18.8%) in the 2025 National Bridge Inventory, as of August 20, 2026.
90 bridges (37.7%) are rated good and 104 (43.5%) fair.
The median Iowa County bridge was built in 1979.
The busiest poor-rated bridge is M Ave over Iowa River (built 1950), carrying about 2,340 vehicles a day.

Good 37.7% · Fair 43.5% · Poor 18.8% of 239 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
M Ave over Iowa River	1950	2,340	Poor
FM over English River	1958	690	Poor
FM over Middle Fk English River	1970	450	Poor
FM over Small	1950	160	Poor
Local over Miller Creek	1900	110	Poor
Local over Convey Creek	1920	100	Poor
Local over Price Creek	1940	100	Poor
FM over Iowa River	1952	92	Poor
FM over Small	1979	90	Poor
FM over North Fork Clear Creek	1963	80	Poor
FM over Little Bear Creek	1970	80	Poor
Local over Deer Creek	1976	71	Poor
Local over Small Stream	1984	71	Poor
Local over Branch Old Mans Creek	1925	71	Poor
Local over Branch of Clear Creek	1978	71	Poor
FM over Small Stream	1930	60	Poor
FM over Small Stream	1959	60	Poor
FM over English River	1957	50	Poor
Local over Branch Old Mans Creek	1930	50	Poor
FM over Small	1952	45	Poor
Local over Little Bear Creek	1978	40	Poor
FM over English River	1950	35	Poor
Local over Old Mans Creek	1975	34	Poor
Local over Miller Creek	1930	30	Poor
FM over Old Mans Creek	1949	30	Poor
Local over Small Stream	1955	30	Poor
Local over Stream	1981	30	Poor
Local over Small Stream	1920	30	Poor
Local over Small Stream	1977	30	Poor
Local over Branch Bradley Creek	1965	26	Poor
Local over Branch Devils Run	1963	26	Poor
Ff Ave over Drainage Ditch	1971	26	Poor
FM over Little Bear Creek	1975	25	Poor
FM over Stream	1980	25	Poor
Local over Stream	1976	20	Poor
Local over Drainage Ditch	1955	20	Poor
Local over North English River	1929	20	Poor
Local over Stream	1976	20	Poor
Poweshiek Iowa Rd over Honey Creek	1969	20	Poor
FM over Gritter Creek	1970	15	Poor
Local over Clear Creek	1905	15	Poor
Local over Br Middle Fork English R	1925	11	Poor
FM over Drainage Way	1945	10	Poor
Local over Small Stream	1969	5	Poor
FM Legno over Devils Run	1900	–	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I-80 over Clear Creek	1963	33,800	Good
I 80 over Stream	1963	33,000	Fair
I-80 over No Name Creek	1963	31,400	Fair
I-80 over Stream	1962	30,300	Fair
I-80 over Old Mans Creek	1962	30,100	Fair
I-80 over Stream	1961	29,700	Good
EB I-80 over V 52 (h Ave)	1963	14,750	Fair
EB I-80 over Iowa 149	1963	14,650	Fair
WB I-80 over V 52 (h Ave)	1963	14,500	Fair
I 80 EB over V38	1964	14,450	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 Iowa County → - all 239, 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.