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180TH Street over Dd

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

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

180TH Street over Dd in Floyd 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 8 (very good condition) on the 0-9 scale.
It was built in 2008, making it 17 years old at the 2025 inventory.
It carries about 44 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 108 of the 214 inventoried bridges in Floyd County rated good (50.5%); 30 (14.0%) 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 48-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	8	8	Very good condition


Structure	Continuous concrete culvert
Length	about 20 ft
Location	096173203
NBI structure number	000000000365360
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	March 2024
Inspection interval (item 91)	48 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 18 over Stewart Creek	1998	11,200	Good
US 18 & 218 over Stewart Creek	1998	10,900	Good
US 18 over Drainage Ditch	1998	10,700	Good
US 18 over Cedar River	1967	10,500	Fair
US 218 over Stream	2001	10,200	Fair
US 218 over Bloody Run	1999	10,000	Good