Cth M (north Ave) over Underwood Creek
Waukesha County, Wisconsin · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Cth M (north Ave) over Underwood Creek in Waukesha County, Wisconsin, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 9 (excellent condition) on the 0-9 scale.
- It was built in 2021, making it 4 years old at the 2025 inventory.
- It carries about 4,550 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 176 of the 370 inventoried bridges in Waukesha County rated good (47.6%); 20 (5.4%) 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.
View this bridge on a map → (43.06041, -88.08867)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 9 | Excellent condition |
| Superstructure | 9 | Excellent condition |
| Substructure | 9 | Excellent condition |
Bridge details
| Structure | Concrete slab |
| Length | about 52 ft |
| Location | at Underwood Creek |
| NBI structure number | B67037400000000 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Wisconsin department of transportation.
Busiest bridges in Waukesha County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ih 94 over Poplar Creek | 1961 | 133,000 | Fair |
| Ih 94 over Br Poplar Creek | 1961 | 133,000 | Fair |
| Ih 94 over Pewaukee River | 1957 | 112,000 | Fair |
| Ih 41/USH 45 over Nor-x-way Channel | 2018 | 86,800 | Good |
| Ih 94 WB over Lrd Maple Ave | 1962 | 75,000 | Good |
| Ih 94 WB over Sth 83 | 1962 | 75,000 | Fair |
All bridges nearby: Waukesha County, WI bridge conditions · every bridge in Waukesha County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.