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Ih 41 over Supple Marsh Creek

Fond du Lac County, Wisconsin · rated Fair in the 2025 National Bridge Inventory

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

Ih 41 over Supple Marsh Creek in Fond du Lac County, Wisconsin, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1951 and reconstructed in 1952, making it 74 years old at the 2025 inventory.
It carries about 44,700 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 98 of the 252 inventoried bridges in Fond du Lac County rated fair (38.9%); 27 (10.7%) 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

Component	Rating (2025)	FHWA scale meaning
Culvert	6	Satisfactory condition

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

Bridge	Built	Vehicles/day	Condition
Sth 23 over Lrd Brooke Street	2001	29,100	Fair
Ih 41 NB over W Br Fond Du Lac River	1953	21,450	Fair
Ih 41 SB over W Br Fond Du Lac River	1961	21,450	Good
Ush 41 NB over Cth N	1999	21,450	Good
Ih 41 SB over Cth N	1999	21,450	Fair
Sth 23 over Taycheeda Creek	1987	20,500	Fair