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I 29 Ia 12 over Drainage-all of Roadway

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

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

I 29 Ia 12 over Drainage-all of Roadway in Woodbury County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1957, making it 68 years old at the 2025 inventory.
It carries about 32,900 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 182 of the 455 inventoried bridges in Woodbury County rated fair (40.0%); 95 (20.9%) 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

Component	Rating (2025)	FHWA scale meaning
Culvert	6	Satisfactory condition

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

Bridge	Built	Vehicles/day	Condition
I29 NB Off Ramp over Perry Creek Conduit	2017	91,000	Good
US 77 over Missouri River & Rd	1981	34,600	Fair
US 77 over I 29 & Ia 12 NB	2012	26,900	Good
I 29 SB over Pierce St Frontage Rd	2018	21,100	Fair
Ia 12 over BNSF Rvr Sts & Ia 376	1936	20,600	Poor
I 29 SB over Bacon Creek	2014	18,900	Fair