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Bridge conditions in Warren County, Iowa

238 inventoried bridges · 48 rated poor · 2025 National Bridge Inventory

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

Of the 238 Warren County bridges in the federal inventory, 48 carry a poor rating. That 20.2% share is roughly 3x the national average.

48 of the 238 bridges in Warren County, Iowa, are rated in poor condition (20.2%) in the 2025 National Bridge Inventory, as of August 20, 2026.
102 bridges (42.9%) are rated good and 88 (37.0%) fair.
The median Warren County bridge was built in 1984.
The busiest poor-rated bridge is FM over North River (built 1960), carrying about 1,714 vehicles a day.

Good 42.9% · Fair 37.0% · Poor 20.2% of 238 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 North River	1960	1,714	Poor
G-58 over Otter Creek	1951	996	Poor
FM over Butcher Creek	1952	830	Poor
FM over S River	1949	807	Poor
FM over Short Creek	1968	717	Poor
W Main St over Small Natural Stream	1959	643	Poor
FM over Stony Creek	1958	400	Poor
Local Road over Branch Otter Creek	1970	288	Poor
R35 10TH Ave over North River	1962	260	Poor
Local over Cavitt Creek	1967	176	Poor
FM over Wolf Creek	1955	110	Poor
Local over Middle River	1940	103	Poor
FM over S River	1950	100	Poor
FM over North River	1949	89	Poor
Local Road over Mill Branch	1920	82	Poor
FM over Cavitt Creek	1967	79	Poor
Local over Middle River	1950	72	Poor
FM over S River	1940	71	Poor
FM over Painter Creek	1900	71	Poor
FM over North River	1960	60	Poor
Local Road over North Wolf Creek	1970	51	Poor
Local over Branch West Creek	1960	51	Poor
Local Road over Branch Painter Creek	1961	51	Poor
FM over Cotton Creek	1974	50	Poor
FM over Branch Coal Creek	1955	50	Poor
FM over S River	1966	50	Poor
Local over Branch Flank Creek	1965	46	Poor
Local over Broadhorn Creek	1915	46	Poor
Local Road over Painter Creek	1958	35	Poor
Local Road over Painter Creek	1947	35	Poor
Local Road over Wolf Creek	1958	30	Poor
Local Road over Branch Otter Creek	1970	30	Poor
Local Road over Flank Creek	1965	30	Poor
Local Road over Flank CR	1955	30	Poor
Local over Felters Branch	1953	30	Poor
Local Road over Branch Coal Creek	1960	26	Poor
Local Road over Flank Creek	1963	26	Poor
Local over Cavitt Creek	1960	26	Poor
Local Road over Lime Stone Creek	1965	20	Poor
Local over Branch North Wolf Creek	1950	15	Poor
Local Road over Branch Otter Creek	1950	15	Poor
Local Road over Box Elder Creek	1940	15	Poor
Grimes St over Branch North River	2000	15	Poor
Roosevelt St over Br North Wolf Creek	1945	11	Poor
Local Road over Painter Creek	1952	11	Poor
Pierce St over Painter Creek	1945	11	Poor
Local over Br.south River	1940	11	Poor
Local over Branch South River	1973	11	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I-35 over Drainage Ditch	1957	24,700	Good
I 35 over Broad Horn Creek	1957	21,000	Fair
I-35 over Drainage Ditch	1958	21,000	Fair
Ia 28 over South Middle Creek	1984	18,500	Good
I 35 SB over North River	2014	12,550	Good
I 35 SB over Badger Creek	2014	12,550	Good
I 35 NB over North River	2014	12,350	Good
I 35 NB over Badger Creek	2016	12,350	Good
SB I 35 over Clanton Creek	2007	11,600	Good
I 35 SB over Middle River	2017	11,600	Good

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.