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Bridge conditions in Montgomery County, Iowa

209 inventoried bridges · 52 rated poor · 2025 National Bridge Inventory

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

Montgomery County has 52 bridges rated poor out of 209 inventoried, a 24.9% share that puts it well above the national rate of about 7%.

52 of the 209 bridges in Montgomery County, Iowa, are rated in poor condition (24.9%) in the 2025 National Bridge Inventory, as of August 20, 2026.
44 bridges (21.1%) are rated good and 113 (54.1%) fair.
The median Montgomery County bridge was built in 1969.
The busiest poor-rated bridge is Old US 71 over BNSF RR (built 1929), carrying about 1,187 vehicles a day.

Good 21.1% · Fair 54.1% · Poor 24.9% of 209 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
Old US 71 over BNSF RR	1929	1,187	Poor
4TH St over Red Oak Creek	1965	861	Poor
FM over Walnut Creek	1967	750	Poor
FM over Walnut Creek	1956	528	Poor
Third St over Middle Nodaway	1939	415	Poor
FM over W Nodaway	1939	300	Poor
FM over Indian Creek	1957	270	Poor
FM over Tarkio Creek	1955	219	Poor
FM over Tarkio Creek Trib	1959	219	Poor
FM over Little Tarkio	1958	219	Poor
FM over Crabapple Creek	1958	199	Poor
FM over Nishnabotna Trib	1957	173	Poor
FM over Tarkio Creek	1949	159	Poor
FM over Walnut Creek Trib	1965	153	Poor
Local Road over Local Creek	1963	112	Poor
Local Rd over M Nodaway River	1952	100	Poor
FM over Little Tarkio Trib	1964	89	Poor
Local over over BNSF RR	1977	61	Poor
Local Road over Minor Drainage	1930	61	Poor
FM over Little Tarkio Trib	1947	60	Poor
Local over Tarkio Creek	1949	60	Poor
FM over Nishnabotna	1942	60	Poor
Local over West Nodaway River	1924	58	Poor
Local Rd over West Nodaway River	1940	45	Poor
FM over Little Tarkio Trib	1947	29	Poor
FM over Nishnabotna Trib	1949	29	Poor
Local Rd over W Nodaway River	1970	26	Poor
Local over Drainage	1945	20	Poor
Local Road over Local Stream	1985	20	Poor
Local Road over Walnut Creek	1951	20	Poor
Local over Nodaway River	1968	20	Poor
Local over Drainage	1942	20	Poor
Local Road over Minor Drainage	1971	20	Poor
Redwood Ave over BNSF RR	1913	15	Poor
Local over Drainage	1952	15	Poor
Local over Tarkio Creek Trib	1956	15	Poor
Local Road over Walnut Creek	1930	15	Poor
Local Rd over Branch Tarkio Creek	1959	15	Poor
Local Rd over Tarkio Creek	1966	11	Poor
Local over Walnut Creek	1966	11	Poor
County Road over Br Tarkio Creek	1956	11	Poor
Local over Drainage	1966	11	Poor
Local Rd over Little Tarkio Creek	1950	11	Poor
Local-cass#104b over Tarkio Creek	1990	11	Poor
Local over Br Walnut Creek	1988	11	Poor
Local over Trib Tarkio	1955	5	Poor
Local over Small Stream	1985	5	Poor
Local over Drainage	1987	5	Poor
Local over Drainage	1969	5	Poor
Local over Nishnabotna Trib	1970	5	Poor
Local over Drainage	1945	5	Poor
Local over Minor Drainage	1966	5	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
Ia 48 over Stream	1931	7,600	Fair
US 34 over East Nishnabotna River	1964	4,460	Fair
Ia 48 over Red Oak Creek	1918	4,460	Fair
US 34 over Indian Creek	1964	4,030	Fair
US 34 over Crabapple Creek	1964	4,030	Fair
US 34 over West Tarkio Creek	1964	3,990	Fair
US 34 over Tarkio River	1964	3,990	Fair
US 34 over Walnut Creek	1964	3,730	Good
US 34 over Little Tarkio Creek	1964	2,880	Fair
US 34 over Middle Nodaway River	1964	2,240	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 Montgomery County → - all 209, 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.