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330TH St over Unnamed Creek

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

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

330TH St over Unnamed Creek in Sioux County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 9 (excellent condition) on the 0-9 scale.
It was built in 2022, making it 3 years old at the 2025 inventory.
It carries about 11 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 281 of the 448 inventoried bridges in Sioux County rated good (62.7%); 14 (3.1%) are rated poor.
Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
Its condition class and component ratings are unchanged from the 2024 inventory.
Its most recent inspection on record is dated March 2024, on a 24-month routine inspection cycle.
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

Component	Rating (2024)	Rating (2025)	FHWA scale meaning
Culvert	9	9	Excellent condition


Structure	Steel culvert
Length	about 25 ft
Location	096440401
NBI structure number	000000000311301
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	March 2024
Inspection interval (item 91)	24 months
Scour (item 113)	8: foundations stable, scour above the top of the footing

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