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Bridge conditions in Calhoun County, Iowa

198 inventoried bridges · 49 rated poor · 2025 National Bridge Inventory

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

Of the 198 Calhoun County bridges in the federal inventory, 49 carry a poor rating. That 24.7% share is roughly 4x the national average.

49 of the 198 bridges in Calhoun County, Iowa, are rated in poor condition (24.7%) in the 2025 National Bridge Inventory, as of August 20, 2026.
50 bridges (25.3%) are rated good and 99 (50.0%) fair.
The median Calhoun County bridge was built in 1976.
The busiest poor-rated bridge is FM over Lake CR. (built 1978), carrying about 359 vehicles a day.

Good 25.3% · Fair 50.0% · Poor 24.7% of 198 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 Lake CR.	1978	359	Poor
Co Rd N-37 over Lake Creek	1985	354	Poor
FM over Dd 261	1963	300	Poor
FM over Dd 9-13	1966	290	Poor
Local over Camp Ck	1973	279	Poor
Co Rd over East Cedar Creek	1968	220	Poor
FM over Dd 181 Big Cedar	1938	219	Poor
FM over E Cedar Creek	1970	180	Poor
FM over Cedar Creek	1971	150	Poor
FM over Cain Creek	1971	110	Poor
FM over Cain Creek	1968	110	Poor
FM over Cedar Creek	1970	71	Poor
Local over Lake Ck	1931	60	Poor
FM over Cedar Creek	1972	60	Poor
P13 Valley Ave over Dd #83	1917	60	Poor
FM over Calhoun Co Dd	1976	45	Poor
Local over D.d. No 20	1900	40	Poor
Local over Dd 9-13	1900	40	Poor
Local over Purgatory CR.	1900	34	Poor
FM over Cedar Creek	1938	34	Poor
Local over Prairie Creek	1980	30	Poor
Local over Dd No 83	1900	30	Poor
FM over Dd	1973	30	Poor
FM over Drainage	1975	26	Poor
Local over Dd 20	1948	26	Poor
Local over N Fork Camp CR	1900	26	Poor
Local over Dd 1-54	1900	26	Poor
Local over Dd 12	1974	26	Poor
180TH St over Dd 88	1900	26	Poor
Local over Dd 2	1975	26	Poor
Local over Dd 37	1960	26	Poor
FM over E.cedar CR.	1938	20	Poor
Local over Camp CR.	1900	20	Poor
Local over D.d.	1900	20	Poor
Local over Dd 65	1929	20	Poor
Local over Dd 13	1974	20	Poor
Local over South Branch Lizard	1957	20	Poor
Local over Lake Creek	1917	20	Poor
Local over Dd. No 31	1971	15	Poor
Local over D.d.	1957	15	Poor
Local over D.d. No 83	1900	15	Poor
Local over E Cedar CR.	1980	15	Poor
Local over Big Cedar CR Dd 181	1900	15	Poor
FM over Dd 82	1938	11	Poor
Local over Lake Creek W Br	1900	11	Poor
Local over Purgatory CR.	1971	11	Poor
Local over Stream	1900	5	Poor
Local over Drainage Ditch	1974	5	Poor
Local over W Cedar CR.	1900	5	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
US 20 over East Cedar Creek	2008	7,000	Good
US 20 over Dd 9 & 13	2008	6,900	Good
US 20 over W Fork Camp Creek	2010	5,900	Good
US 20 over Drainage Ditch No 1 & 54	2010	5,900	Good
US 20 WB over Cc RR	2011	3,450	Good
US 20 EB over Cc RR	2010	3,450	Good
Ia 7 over over Cc RR	1974	2,560	Fair
US 20 EB over Ia 4	2012	2,410	Good
US 20 WB over Ia 4	2012	2,410	Good
Ia 175 over Raccoon River	1980	1,560	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 Calhoun County → - all 198, 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.