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Dogwood Ave over Small Stream

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

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

Dogwood Ave over Small Stream in Lyon 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 2015, making it 10 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 104 of the 273 inventoried bridges in Lyon County rated good (38.1%); 70 (25.6%) 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 July 2023, 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	Concrete culvert
Length	about 21 ft
Location	100472402
NBI structure number	000000000366125
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	July 2023
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
Ia 9 over Stream	1980	4,840	Good
Ia 9 over Stream	1940	4,520	Fair
Ia 9 over Bloodrun Creek	1977	4,520	Fair
US 75 & Ia 9 over Moon Creek	1972	4,400	Fair
Ia 9 over Rock River	1974	3,920	Fair
Ia 9 over Mud Creek	1975	3,270	Fair