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Sth 23 over Wis River Overflow

Sauk County, Wisconsin · rated Fair in the 2025 National Bridge Inventory

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

Sth 23 over Wis River Overflow in Sauk County, Wisconsin, 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 2005, making it 20 years old at the 2025 inventory.
It carries about 2,900 vehicles a day (traffic count year 2021).
Its listed owner is the state highway agency.
It is one of 112 of the 275 inventoried bridges in Sauk County rated fair (40.7%); 25 (9.1%) 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

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

Bridge	Built	Vehicles/day	Condition
Ih 90 Eb-ih 94 EB over Ush 12	1960	23,500	Fair
Ih 90 Wb-ih 94 WB over Ush 12	1960	23,500	Fair
Ih 90 Eb-ih 94 EB over Sth 23	1961	23,500	Fair
Ih 90 Wb-ih 94 WB over Sth 23	1961	23,500	Good
Ih 90 Eb-ih 94 EB over Mirror Lake	1961	23,500	Fair
Ih 90 Wb-ih 94 WB over Mirror Lake	1961	23,500	Fair