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Ia 4 over Mosquito Creek

Guthrie County, Iowa · rated Good in the 2025 National Bridge Inventory

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

Ia 4 over Mosquito Creek in Guthrie County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2001, making it 24 years old at the 2025 inventory.
It carries about 1,260 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 65 of the 263 inventoried bridges in Guthrie County rated good (24.7%); 94 (35.7%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 100 ft
Location	0.3 mi. S of S Jct IA 141
NBI structure number	000000000026071
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Ia 44 over Bays Branch Creek	1981	3,460	Good
Ia 44 over Branch Mosquito Creek	1981	3,460	Fair
Ia 25 over South Raccoon River	1983	3,200	Good
Ia 44 over Brushy Creek	1972	3,200	Fair
Ia 44 over Middle Raccoon River	1972	3,200	Fair
Ia 141 over Dry Run Creek	2004	2,160	Good