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Bridge conditions in Polk County, Iowa

548 inventoried bridges · 34 rated poor · 2025 National Bridge Inventory

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

The federal inventory lists 548 bridges in Polk County: 319 rated good, 195 fair, and 34 poor.

34 of the 548 bridges in Polk County, Iowa, are rated in poor condition (6.2%) in the 2025 National Bridge Inventory, as of August 20, 2026.
319 bridges (58.2%) are rated good and 195 (35.6%) fair.
The median Polk County bridge was built in 1994.
The busiest poor-rated bridge is Fleur Dr over Old UP RR & SW 22ND (built 1936), carrying about 15,634 vehicles a day.

Good 58.2% · Fair 35.6% · Poor 6.2% of 548 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
Fleur Dr over Old UP RR & SW 22ND	1936	15,634	Poor
SW 9TH St over Cherry RR Mlk Pkwy	1967	14,108	Poor
SW 9TH St over Raccoon River & Trail	1967	12,809	Poor
SE 6TH St over Des Moines River	1976	7,911	Poor
SW 8TH St over RR Cherry Mlk Jr Pkwy	1967	6,875	Poor
SE 5TH St over Yeader Creek	1976	4,717	Poor
Williams St over Four Mile Creek	1978	3,908	Poor
Walnut St over Des Moines River	1911	3,844	Poor
Grant St South over Mud Creek	1927	2,902	Poor
Fleur Dr over Raccoon and RR	1936	2,825	Poor
NE 38TH St over I 80	1959	1,654	Poor
St Johns Rd over Drainage	1900	684	Poor
NE 108TH St over Camp Creek	1950	467	Poor
NE 38TH St over Drainage Ditch	1914	459	Poor
NE Berwick Drive over UP Railroad	1948	406	Poor
FM SW Mckinley over Frink Creek	1937	246	Poor
NW 86TH St over Little Beaver Creek	1926	199	Poor
SE 48TH Ave over Mud Creek Tributary	1962	162	Poor
SE 45TH St over over UP RR	1962	148	Poor
FM over Branch Skunk River	1968	139	Poor
NE 150TH Ave over Skunk River Tributary	1968	132	Poor
NE 86TH Ave over Four Mile Creek	1941	89	Poor
SE 124TH St over Camp Creek	1930	81	Poor
NW 166TH Ave over Little Creek	1917	80	Poor
Local Road over Mud Creek	1913	79	Poor
NW 150TH Ave over Turkey Creek Tributary	1980	51	Poor
SE 80TH Ave over Mud Creek	1920	50	Poor
Local Road over Indian Creek	1916	45	Poor
NE 23RD Ave over Camp Creek	1959	36	Poor
Local Road over Skunk River	1928	29	Poor
SE Miller Dr over Camp Creek	1914	26	Poor
Local Road over Mud Creek	1925	20	Poor
Off NE 108TH St over Camp Creek Tributary	1950	10	Poor
Yellow Banks Pk over Stream	1980	–	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I-235 over Drainage Ditch	1966	118,600	Fair
I-235 & 17TH St over Blue Creek	1968	113,200	Fair
I 235 over Des Moines Rvr Rbrtraydr	1962	88,200	Good
I-35 & I-80 over N Walnut Creek	1958	81,600	Fair
I 35 over Trib to Four Mile Creek	2018	58,300	Good
EB I-235 over Walnut Creek	1968	58,050	Fair
WB I-235 over Walnut Creek	1968	58,050	Fair
EB I-235 over 17TH St	1967	56,600	Fair
WB I-235 over 17TH St	1967	56,600	Fair
NB I-35 EB I-80 over Walnut Creek	1958	55,950	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 Polk County → - all 548, 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.