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Ia 175 over Hardin Creek

Calhoun County, Iowa · rated Fair in the 2025 National Bridge Inventory

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

Ia 175 over Hardin Creek in Calhoun County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1990, making it 35 years old at the 2025 inventory.
It carries about 950 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 99 of the 198 inventoried bridges in Calhoun County rated fair (50.0%); 49 (24.7%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 117 ft
Location	0.7 mi. W of jct. SR P21
NBI structure number	000000000017021
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 20 over East Cedar Creek	2008	7,000	Good
US 20 over Dd 9 & 13	2008	6,900	Good
US 20 over W Fork Camp Creek	2010	5,900	Good
US 20 over Drainage Ditch No 1 & 54	2010	5,900	Good
US 20 WB over Cc RR	2011	3,450	Good
US 20 EB over Cc RR	2010	3,450	Good