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FM 145 Ave over Prairie Creek

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

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

FM 145 Ave over Prairie Creek in Delaware County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1971, making it 54 years old at the 2025 inventory.
It carries about 1,296 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 160 of the 294 inventoried bridges in Delaware County rated fair (54.4%); 20 (6.8%) 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


Structure	Continuous steel stringer or multi-beam girder
Length	about 154 ft
Location	089062604
NBI structure number	000000000142031
Condition class	Fair

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