Sth 42-4th St over Ahnapee River
Kewaunee County, Wisconsin · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Sth 42-4th St over Ahnapee River in Kewaunee County, Wisconsin, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1984, making it 41 years old at the 2025 inventory.
- It carries about 4,331 vehicles a day (traffic count year 2022).
- Its listed owner is a city or municipal highway agency.
- It is one of 52 of the 92 inventoried bridges in Kewaunee County rated fair (56.5%); 5 (5.4%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: substructure 7 to 6.
- Its most recent inspection on record is dated June 2024, on a 48-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 → (44.61158, -87.43853)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 7 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 168 ft |
| Location | 0.5M N Jct Sth 54 |
| NBI structure number | B31003000000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | June 2024 |
| Inspection interval (item 91) | 48 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 Kewaunee County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Sth 57 over Unnamed Stream | 2005 | 10,800 | Fair |
| Sth 57 | Cth Dk over Red River | 1958 | 10,100 | Fair |
| Sth 54 over Br School Creek | 1981 | 7,800 | Fair |
| Sth 54 over School Creek | 1997 | 7,800 | Good |
| Sth 54 over School Creek | 1997 | 7,800 | Good |
| Sth 54 over School Creek | 1997 | 7,800 | Fair |
All bridges nearby: Kewaunee County, WI bridge conditions · every bridge in Kewaunee County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.