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Bridge conditions in Marshall County, Iowa

303 inventoried bridges · 130 rated poor · 2025 National Bridge Inventory

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

Marshall County has 130 bridges rated poor out of 303 inventoried, a 42.9% share that puts it well above the national rate of about 7%.

130 of the 303 bridges in Marshall County, Iowa, are rated in poor condition (42.9%) in the 2025 National Bridge Inventory, as of August 20, 2026.
100 bridges (33.0%) are rated good and 73 (24.1%) fair.
The median Marshall County bridge was built in 1978.
The busiest poor-rated bridge is So Center St over Linn Creek (built 1951), carrying about 10,448 vehicles a day.

Good 33.0% · Fair 24.1% · Poor 42.9% of 303 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
So Center St over Linn Creek	1951	10,448	Poor
So Center St over RR and Madison St	1951	9,491	Poor
S. 18TH Ave over over UP RR	1980	6,813	Poor
Local over UP RR & Lynn Ck	1971	3,584	Poor
FM over Rock Creek	1965	2,838	Poor
FM over Iowa River	1955	2,838	Poor
FM over Iowa River	1953	1,365	Poor
FM over N Timber Creek	1963	903	Poor
FM over Linn Creek	1988	737	Poor
FM over Lutes Creek	1957	697	Poor
Walnut St over Abandon RR	1977	689	Poor
FM over Small	1983	509	Poor
W State St over Drainage	1900	472	Poor
FM over Little Asher CR	1968	432	Poor
So 3RD Ave over Anson Creek	1979	418	Poor
FM over Linn CR	1956	369	Poor
FM over Branch Burnette Creek	1984	304	Poor
FM over Mud Creek	1967	265	Poor
FM over Big Minerva Creek	1967	265	Poor
Local Rd over Timber Creek	1977	227	Poor
FM over Linn Creek	1963	216	Poor
Local over Linn CR	1916	157	Poor
Local over Creek	1955	148	Poor
FM over Minerva Creek	1916	147	Poor
Local over Creek	1916	145	Poor
Local over Creek	1916	123	Poor
FM over Little Asher CR	1916	118	Poor
FM over Creek	1917	108	Poor
Local over Creek	1953	104	Poor
FM over South Timber Creek	1942	88	Poor
Local over Lutes Creek	1938	82	Poor
Local over Lutes Creek	1937	82	Poor
Local over Branch N Skunk River	1910	82	Poor
FM over Stream	1935	79	Poor
FM over Timber Creek	1947	79	Poor
FM over N Skunk River	1917	79	Poor
Local over Creek	1944	73	Poor
FM over Burnett Creek	1921	69	Poor
FM over Devils Run Creek	1940	69	Poor
Local over Rock CR	1942	62	Poor
Local over Creek	1939	62	Poor
140TH St over Minerva Creek	1912	62	Poor
FM over Timber Creek	1945	59	Poor
FM over South Timber Creek	1954	59	Poor
FM over Minerva Creek	1957	59	Poor
Local over Snipe Creek	1915	51	Poor
Local over Middle Timber Creek	1916	51	Poor
Local over Small	1979	51	Poor
Local over Creek	1956	49	Poor
Local over N Skunk River	1917	49	Poor
FM over Iowa River	1952	49	Poor
Local over Brush Creek	1917	47	Poor
Local over Brush Creek	1977	47	Poor
150TH St over Burnett CR	1979	47	Poor
Local over Creek	1918	47	Poor
Local over South Timber Creek	1938	44	Poor
Local over Linn CR	1945	44	Poor
Local over Middle Timber Creek	1940	41	Poor
Local over Branch North Timber Crk	1924	41	Poor
Local over Mud Creek	1946	41	Poor
Local over Br Minerva Creek	1941	40	Poor
FM over South Timber Creek	1957	39	Poor
FM over Minerva Creek	1981	39	Poor
Local over Little Asher CR	1984	39	Poor
Local over Dowd Creek	1916	39	Poor
Local over Snipe Creek	1918	35	Poor
Local over Snipe Creek	1917	35	Poor
Local over Creek	1917	35	Poor
Local over Creek	1918	35	Poor
Local over South Timber Creek	1949	34	Poor
Local over Br Wolf Creek	1953	33	Poor
Local over Brush Creek	1964	30	Poor
Local over Raven Creek	1934	30	Poor
Local over Creek	1918	30	Poor
Local over North Timber Creek	1951	30	Poor
Local over Branch N Timber Creek	1920	30	Poor
Local over Rock CR	1950	30	Poor
Local over Minerva CR	1946	30	Poor
Local over Br Linn CR	1942	30	Poor
Local over Minerva CR	1919	30	Poor
Local over Linn Creek	1919	30	Poor
Local over Creek	1940	30	Poor
Local over Br Minerva CR	1919	30	Poor
FM over Lutes Creek	1940	29	Poor
Local over North Skunk River	1938	29	Poor
Local over Asher Creek	1955	29	Poor
FM over Creek	1963	29	Poor
Local over Branch N Skunk River	1940	26	Poor
Local over Clear Creek	1941	26	Poor
Local over Minerva CR	1949	26	Poor
Local over Minerva CR	1950	26	Poor
Local over Br Minerva CR	1984	26	Poor
Local over Mud Creek	1985	26	Poor
Local over Br Raven Creek	1986	26	Poor
FM over Creek	1918	25	Poor
Parker Ave over South Timber Creek	1950	21	Poor
Local over Snipe Creek	1939	21	Poor
Local over Davisons Creek	1951	21	Poor
Local over Linn Creek	1916	21	Poor
Local over Minerva CR	1917	21	Poor
Local over Little Asher Creek	1944	21	Poor
Local over Creek	1947	21	Poor
Local over Creek	1940	21	Poor
Local over N Minerva Creek	1917	21	Poor
Local over Snipe Creek	1920	20	Poor
Local over Davisons Creek	1978	20	Poor
Local over Burnett CR	1957	20	Poor
Local over Creek	1945	20	Poor
Local over Small	1983	20	Poor
Local over Brush Creek	1917	16	Poor
Local over South Timber Creek	1939	16	Poor
Local over Snipe Creek	1950	16	Poor
Local over Br Minerva CR	1947	16	Poor
Local over Creek	1956	16	Poor
Local over Dowd Creek	1916	16	Poor
Local over Branch S Timber Creek	1951	15	Poor
Local over Branch N Skunk River	1954	15	Poor
FM over Minerva Creek	1915	15	Poor
Local over Br Minerva CR	1917	15	Poor
Local over South Timber Creek	1932	11	Poor
Local over Branch Snipe Creek	1920	11	Poor
Local over Branch S Timber Creek	1938	11	Poor
Local over Clear Creek	1950	11	Poor
Local over Creek	1983	11	Poor
Local over Mud Creek	1945	11	Poor
Local over Stream	1981	11	Poor
Local over Branch N Skunk River	1939	10	Poor
Local over North Timber Creek	1950	5	Poor
Local over Burnett CR	1917	5	Poor
Local over Minerva CR	1945	5	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
US 30 over Davisons Creek	1954	14,700	Fair
Ia 14 over Linn Creek	1985	13,300	Good
Ia 14 over UP RR Madison&market St	1985	13,300	Fair
So. 6TH St. over Linn Creek	1984	11,300	Fair
So Center St over Linn Creek	1951	10,448	Poor
So Center St over RR and Madison St	1951	9,491	Poor
Ia 330 SB over North Timber Creek	1979	9,000	Good
S 3RD St over UP RR & St	1984	9,000	Fair
Ia 330 over Drainage Ditch	1982	8,300	Good
Ia 330 NB over North Skunk River	1969	8,300	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.