Cth Bb over Koshkonong Creek
Dane County, Wisconsin · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Cth Bb over Koshkonong Creek in Dane County, Wisconsin, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1914, making it 111 years old at the 2025 inventory.
- It carries about 1,500 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- 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 → (43.08986, -89.16939)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 3 | Serious condition |
| Substructure | 4 | Poor condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 29 ft |
| Location | 1.9M E Jct Cth N |
| NBI structure number | P13003200000000 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Wisconsin department of transportation.
All bridges nearby: Dane County, WI bridge conditions · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.