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Ih 43 SB over Ih 39 / Ih 90 / Sth 81

Rock County, Wisconsin · rated Good in the 2025 National Bridge Inventory

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

Ih 43 SB over Ih 39 / Ih 90 / Sth 81 in Rock County, Wisconsin, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2021, making it 4 years old at the 2025 inventory.
It carries about 5,800 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 168 of the 304 inventoried bridges in Rock County rated good (55.3%); 13 (4.3%) 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	Continuous steel stringer or multi-beam girder
Length	about 2,227 ft
Location	Ih 43 / Ih 39 / Ih 90 Int
NBI structure number	B53030400000000
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Ih 39 /ih 90 over Br Rock River	2018	57,700	Good
Ih 39 SB / Ih 90 E over Spring Brook / Spring Br	2019	38,500	Good
Ih 39 NB / Ih 90 W over Spring Brook / Spring Br	2018	38,500	Good
Ih 39 SB / Ih 90 E over Cth O	2003	32,550	Good
Ih 39 NB/90 WB over Cth O/ East Delavan Road	2004	32,550	Good
Ih 39 SB / Ih 90 E over Cnw RR	2019	32,550	Good