Ush 18 over Koshkonong Creek
Jefferson County, Wisconsin · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ush 18 over Koshkonong Creek in Jefferson 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 2000, making it 25 years old at the 2025 inventory.
- It carries about 4,700 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 72 of the 182 inventoried bridges in Jefferson County rated fair (39.6%); 9 (4.9%) 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 January 2025, 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 → (43.00873, -89.01279)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 74 ft |
| Location | 0.5M E Jct Sth 134 |
| NBI structure number | B28010500000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | January 2025 |
| 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 Jefferson County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ih 94 WB over Lrd Newville Rd | 2024 | 43,300 | Good |
| Ih 94 WB over Lrd Rock Lake Rd | 2024 | 43,300 | Good |
| Ih 94 EB over Lrd Willow Glen Rd | 1963 | 24,600 | Fair |
| Ih 94 WB over Lrd Willow Glen Rd | 1963 | 24,600 | Fair |
| Ih 94 EB over Cth P | 1964 | 21,400 | Fair |
| Ih 94 WB over Cth P | 1964 | 21,400 | Good |
All bridges nearby: Jefferson County, WI bridge conditions · every bridge in Jefferson County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.