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EB I-235 over E 21ST Street

Polk County, Iowa · rated Good in the 2025 National Bridge Inventory

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

EB I-235 over E 21ST Street in Polk County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2005, making it 20 years old at the 2025 inventory.
It carries about 35,150 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 319 of the 548 inventoried bridges in Polk County rated good (58.2%); 34 (6.2%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 93 ft
Location	0.3 mi. E of Jct. IA #163
NBI structure number	000000000042971
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I-235 over Drainage Ditch	1966	118,600	Fair
I-235 & 17TH St over Blue Creek	1968	113,200	Fair
I 235 over Des Moines Rvr Rbrtraydr	1962	88,200	Good
I-35 & I-80 over N Walnut Creek	1958	81,600	Fair
I 35 over Trib to Four Mile Creek	2018	58,300	Good
EB I-235 over Walnut Creek	1968	58,050	Fair