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I 35 SB over Middle River

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

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

I 35 SB over Middle River in Warren 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 2017, making it 8 years old at the 2025 inventory.
It carries about 11,600 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 102 of the 238 inventoried bridges in Warren County rated good (42.9%); 48 (20.2%) 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 336 ft
Location	0.4 Miles South of Ia 92
NBI structure number	000000000051351
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I-35 over Drainage Ditch	1957	24,700	Good
I 35 over Broad Horn Creek	1957	21,000	Fair
I-35 over Drainage Ditch	1958	21,000	Fair
Ia 28 over South Middle Creek	1984	18,500	Good
I 35 SB over North River	2014	12,550	Good
I 35 SB over Badger Creek	2014	12,550	Good