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US 30 over Davisons Creek

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

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

US 30 over Davisons Creek in Marshall County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1954 and reconstructed in 2002, making it 71 years old at the 2025 inventory.
It carries about 14,700 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 73 of the 303 inventoried bridges in Marshall County rated fair (24.1%); 130 (42.9%) 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

Component	Rating (2025)	FHWA scale meaning
Culvert	6	Satisfactory condition


Structure	Continuous concrete culvert
Length	about 52 ft
Location	1.4 Miles W of Jct Ia 146
NBI structure number	000000000035340
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Ia 14 over Linn Creek	1985	13,300	Good
Ia 14 over UP RR Madison&market St	1985	13,300	Fair
So. 6TH St. over Linn Creek	1984	11,300	Fair
So Center St over Linn Creek	1951	10,448	Poor
So Center St over RR and Madison St	1951	9,491	Poor
Ia 330 SB over North Timber Creek	1979	9,000	Good