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
- 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 ).
- 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.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated April 2023, on a 24-month routine inspection cycle.
- 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.
View this bridge on a map → (43.79063, -88.48287)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 28 ft |
| Location | 0.2 Mi North of Sth 23 |
| NBI structure number | B20383800000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Wisconsin department of transportation.
Busiest bridges in Fond du Lac County
| 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 |
All bridges nearby: Fond du Lac County, WI bridge conditions · every bridge in Fond du Lac County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.