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310TH St over Deadbrier Creek

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

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

310TH St over Deadbrier Creek in Greene County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1998, making it 27 years old at the 2025 inventory.
It carries about 26 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 82 of the 168 inventoried bridges in Greene County rated fair (48.8%); 25 (14.9%) 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

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

Bridge	Built	Vehicles/day	Condition
Ia 4 (N Elm St) over UP RR & Mckinley St	2012	6,200	Good
US 30 over UP RR & 222ND	2017	4,970	Good
US 30 over West Beaver Creek	2017	4,970	Good
US 30 over Little Beaver Creek	2009	4,570	Good
US 30 over Hardin Creek	1957	4,230	Fair
US 30 over Buttrick Creek	1957	4,230	Fair