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FM over W Fork Floyd River

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

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

FM over W Fork Floyd River in Sioux County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1967, making it 58 years old at the 2025 inventory.
It carries about 2,992 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 153 of the 448 inventoried bridges in Sioux County rated fair (34.2%); 14 (3.1%) 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	Continuous steel stringer or multi-beam girder
Length	about 127 ft
Location	095451201
NBI structure number	000000000310210
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 75 over W Fork Floyd River	1989	7,300	Good
US 75 over Stream	1998	7,300	Good
US 18 over Rogg Creek	1985	6,700	Good
Ia 60 over Stream	1991	6,500	Good
Ia 10 over Floyd River	1993	5,300	Fair
US 18 over Drainage Ditch	1976	5,200	Fair