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310TH St over Ballard Creek

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

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

310TH St over Ballard Creek in Story County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1936 and reconstructed in 1974, making it 89 years old at the 2025 inventory.
It carries about 100 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 160 of the 302 inventoried bridges in Story County rated fair (53.0%); 40 (13.2%) 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	Steel stringer or multi-beam girder
Length	about 48 ft
Location	082242409
NBI structure number	000000000314350
Condition class	Fair

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