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SB Ia 5 over North River

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

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

SB Ia 5 over North River in Warren County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1996, making it 29 years old at the 2025 inventory.
It carries about 8,250 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 88 of the 238 inventoried bridges in Warren County rated fair (37.0%); 48 (20.2%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 291 ft
Location	0.9 Mi. S of Jct US 65
NBI structure number	000000000606315
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 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