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Irr Bia Rte 15 over Trout River

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

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

Irr Bia Rte 15 over Trout River in Vilas 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 2020, making it 5 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2024).
It is one of 13 of the 29 inventoried bridges in Vilas County rated good (44.8%); 3 (10.3%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 54 ft
Location	2.3KM SE of Jct Cth H
NBI structure number	0000F55432B0333
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Ush 45-sth 17-sth over Eagle River	2000	14,000	Fair
Sth 17-sth 70 over Mud Creek	1981	9,600	Fair
Sth 70 over Wisconsin River 53	1993	6,000	Fair
Sth 70 over Link Creek	1988	5,700	Fair
Sth 47 over Mishonagon Creek	2008	4,800	Good
Sth 70 over Saint Germain River	1968	4,300	Fair