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590TH Ave over Grant 5 Open Ditch

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

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

590TH Ave over Grant 5 Open Ditch in Story County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1938 and reconstructed in 1969, making it 87 years old at the 2025 inventory.
It carries about 230 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 40 of the 302 inventoried bridges in Story County rated poor (13.2%); 40 (13.2%) 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	Steel stringer or multi-beam girder
Length	about 33 ft
Location	083231002
NBI structure number	000000000314700
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
I-35 over Ballard Creek	1964	48,300	Fair
I-35 over Walnut Creek	1964	48,300	Fair
I 35 over South Skunk Rvr Overflow	2017	48,300	Good
I-35 over Drainage Ditch	1967	28,300	Good
US 69 over Ioway Creek	1924	24,600	Good
NB I-35 over Bike Path	1964	24,150	Fair