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Sth 21 over Wisconsin R Backwater

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

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

Sth 21 over Wisconsin R Backwater in Adams 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 2010, making it 15 years old at the 2025 inventory.
It carries about 4,300 vehicles a day (traffic count year 2021).
Its listed owner is the state highway agency.
It is one of 27 of the 42 inventoried bridges in Adams County rated good (64.3%); 1 (2.4%) 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

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

Bridge	Built	Vehicles/day	Condition
Sth 13 over Carter Creek	1937	7,100	Fair
Sth 13-main St over Little Roche A Cri Creek	1993	7,020	Fair
Sth 13 over Fourteen Mile Creek	1957	5,800	Fair
Sth 21 over Wisconsin River	1959	4,600	Fair
Sth 13 over Big Roche A Cri Lake	2012	4,200	Good
Sth 21 over Big Roche A Cri Creek	1950	3,700	Fair