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Bridge conditions in Pottawattamie County, Iowa

557 inventoried bridges · 50 rated poor · 2025 National Bridge Inventory

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

Pottawattamie County tracks close to typical: 50 of its 557 inventoried bridges (9.0%) are rated poor, against a national rate of about 7%.

50 of the 557 bridges in Pottawattamie County, Iowa, are rated in poor condition (9.0%) in the 2025 National Bridge Inventory, as of August 20, 2026.
219 bridges (39.3%) are rated good and 288 (51.7%) fair.
The median Pottawattamie County bridge was built in 1980.
The busiest poor-rated bridge is South Expressway over Viaduct(rr & Streets) (built 1976), carrying about 7,488 vehicles a day.

Good 39.3% · Fair 51.7% · Poor 9.0% of 557 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
South Expressway over Viaduct(rr & Streets)	1976	7,488	Poor
9TH Ave over Indian Creek	1930	4,059	Poor
5TH Ave over Indian Creek	1935	3,013	Poor
Fm-magnolia Rd over Mosquito Creek	1965	2,949	Poor
Creek Top Rd over Indian Creek	1937	2,027	Poor
North 13TH Street over Indian Creek	1937	2,027	Poor
FM over Pony Creek	1966	1,733	Poor
Railroad Hwy over Stream	1952	1,676	Poor
Tamarack Road over over BNSF RR	1930	1,325	Poor
Ia 92 over Indian Creek	1938	1,180	Poor
1ST Street over Indian Creek	1936	684	Poor
FM over Drainage	1964	270	Poor
7TH Ave over Indian Creek	1930	235	Poor
L19 over I-29	1958	229	Poor
3RD Ave over Indian Creek	1935	179	Poor
Broadway to RR over Indian Creek	1937	126	Poor
Fm-310th Street over Iais RR	1952	110	Poor
FM over E Nishnabotna River	1958	60	Poor
310TH Street over Stream	1994	60	Poor
Teakwood Road over Neola Creek	1978	60	Poor
Sumac Rd over Stream	1949	45	Poor
210TH Street over Pigeon Creek	1952	40	Poor
Fm-145th Street over Drainage	1959	40	Poor
Local over Graybill Creek	1950	29	Poor
Elmtree Road over Silver Creek	1961	29	Poor
Dogwood Road over Silver Creek	1930	29	Poor
Local over Graybill Creek	1951	26	Poor
470TH Street over Jordan Creek	1967	26	Poor
Missouri Avenue over Walnut Creek	1953	26	Poor
430TH Street over Stream	1940	26	Poor
FM over Mud Creek	1976	20	Poor
Road L-34 over Stream	1965	20	Poor
Rosewood Road over Keg Creek	1976	20	Poor
320TH Street over Stream	1976	20	Poor
Lombardy Road over Little Silver Creek	1989	20	Poor
432ND Street over Jordan Creek	1968	15	Poor
Rosewood Road over Second Creek	1949	15	Poor
Local over Drainage	1995	11	Poor
250TH Street over Stream	1940	11	Poor
Idelwood Road over Walnut Creek	1977	11	Poor
390TH Street over Iais RR	1952	11	Poor
Inca Lane over Pigeon Creek	1924	11	Poor
Sumac Road over Stream	1992	11	Poor
Magnolia Road over Stream	1982	11	Poor
Hemlock Ave over Graybill Creek	1947	5	Poor
Edison Lane over Jordan Creek	1976	5	Poor
Magnolia Road over Stream	1961	5	Poor
515TH Street over Stream	1991	5	Poor
220TH Street over Pigeon Creek	1925	5	Poor
510TH Street over Stream	1992	5	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I-480 & US 6 over Missouri River & RR	1966	53,700	Fair
I-80 EB over Missouri River Rd & RR	1972	31,550	Fair
I 80 & US 6 over Little Mosquito Creek	1966	31,100	Fair
I 80 WB over Missouri Rvr Rd RR	2010	25,250	Good
I 29 SB over I-80 & I-29 Interchange	2014	23,900	Good
I-80 over Bedell Creek	1965	23,800	Fair
I-80 over Stream	1965	23,600	Fair
I 80 over Drainage Ditch	1966	23,000	Fair
I-80 over Stream	1965	22,600	Fair
I 29 over Drainage Ditch	2022	20,600	Good

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

Every bridge in Pottawattamie County → - all 557, 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.