Cth W over Thunder Lake
Oneida County, Wisconsin · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Cth W over Thunder Lake in Oneida County, Wisconsin, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1977, making it 48 years old at the 2025 inventory.
- It carries about 322 vehicles a day (traffic count year 2024).
- Its listed owner is the county highway agency.
- It is one of 12 of the 61 inventoried bridges in Oneida County rated poor (19.7%); 12 (19.7%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (45.66918, -89.39117)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 4 | Poor condition |
| Superstructure | 4 | Poor condition |
| Substructure | 9 | Excellent condition |
Bridge details
| Structure | Concrete slab |
| Length | about 44 ft |
| Location | 1.1M W Jct Sth 17 |
| NBI structure number | B43002200000000 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Wisconsin department of transportation.
Busiest bridges in Oneida County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ush 51 over Minocqua Lake | 1993 | 14,700 | Fair |
| Lrd Davenport St over Wisconsin River 47 | 1995 | 12,554 | Fair |
| Lrd Kemp Street over Wisconsin River 46 | 1956 | 8,213 | Poor |
| Ush 51 over Bearskin Creek | 1992 | 8,200 | Good |
| Ush 51 over Wis Central RR | 1992 | 7,100 | Fair |
| Ush 51 over Cth N | 1992 | 7,100 | Good |
All bridges nearby: Oneida County, WI bridge conditions · every bridge in Oneida County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.