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Derby Ave SW over Stream

Johnson County, Iowa · rated Poor in the 2025 National Bridge Inventory

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

Derby Ave SW over Stream in Johnson County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
It was built in 1954, making it 71 years old at the 2025 inventory.
It carries about 60 vehicles a day (traffic count year 2021).
Its listed owner is the county highway agency.
It is one of 34 of the 376 inventoried bridges in Johnson County rated poor (9.0%); 34 (9.0%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Timber stringer or multi-beam girder
Length	about 20 ft
Location	078083402
NBI structure number	000000000203860
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
I 80 EB over Iowa River	1960	32,900	Good
US 218 over Deer Creek	1970	32,400	Good
I 80 WB over Iowa River	1960	32,050	Good
EB I-80 over over US 6 & Iais RR	1995	31,000	Fair
I 80 WB over over US 6 & Iais RR	1992	31,000	Fair
EB I-80 over Cic Railway	1963	30,600	Fair