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Marion St-275 A over Maquoketa River

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

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

Marion St-275 A over Maquoketa River in Delaware County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2003, making it 22 years old at the 2025 inventory.
It carries about 681 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 114 of the 294 inventoried bridges in Delaware County rated good (38.8%); 20 (6.8%) are rated poor.
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


Structure	Continuous prestressed concrete stringer or multi-beam girder
Length	about 243 ft
Location	000000000
NBI structure number	000000000006051
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US 20 over Stream	1963	9,700	Fair
US 20 over Stream	1963	9,000	Good
US 20 over Drainage Ditch	1963	9,000	Fair
Ia 13 over Maquoketa River	1991	7,900	Good
Ia 13 over US 20	1970	6,400	Fair
W Marion St over Maquoketa River	1980	6,294	Poor