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South Ave over Iowa River

Hardin County, Iowa · rated Poor in the 2025 National Bridge Inventory

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

South Ave over Iowa River in Hardin County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
It was built in 1957, making it 68 years old at the 2025 inventory.
It carries about 1,041 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 69 of the 241 inventoried bridges in Hardin County rated poor (28.6%); 69 (28.6%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 169 ft
Location	089201708
NBI structure number	000000000176590
Condition class	Poor

Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.

Bridge	Built	Vehicles/day	Condition
US 20 over Drainage	2003	9,800	Good
US 20 over Drainage	2003	9,200	Good
US 20 over Iowa River	2003	9,200	Good
US 65 over Iowa River	2011	7,800	Good
Washington St over Iowa River	1934	6,251	Fair
US 65 over Beaver Creek	1976	5,300	Good