Lrd 170TH Ave over Br Willow River
St. Croix County, Wisconsin · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Lrd 170TH Ave over Br Willow River in St. Croix County, Wisconsin, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1924 and reconstructed in 1970, making it 101 years old at the 2025 inventory.
- It carries about 150 vehicles a day (traffic count year 2022).
- Its listed owner is a town or township highway agency.
- It is one of 114 of the 297 inventoried bridges in St. Croix County rated fair (38.4%); 10 (3.4%) are rated poor.
- Its traffic status in the 2025 inventory is posted for another load-capacity restriction (speed, number of vehicles on the bridge, etc.) (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated October 2024, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- 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 → (45.10836, -92.4213)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete slab |
| Length | about 30 ft |
| Location | 0.8M E Jct Cth T |
| NBI structure number | P55009100000000 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for another load-capacity restriction (speed, number of vehicles on the bridge, etc.) |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Wisconsin department of transportation.
Busiest bridges in St. Croix County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ih 94-ush 12-sth 3 over Sth 35 SB | 1972 | 83,400 | Fair |
| Ih 94-ush 12-sth 3 over Lrd Front St | 1972 | 82,400 | Fair |
| Ih 94 Wb-ush 12 WB over Quixote Ave-st Croix Riv | 1973 | 41,700 | Fair |
| Ih 94 Eb-ush 12 EB over Lrd Quixote Ave-st Croix | 1995 | 41,700 | Fair |
| Lrd Carmichael Rd over Ih 94-ush 12-sth 35 | 1991 | 30,600 | Fair |
| Ih 94 EB over Sth 35 | 2000 | 28,500 | Good |
All bridges nearby: St. Croix County, WI bridge conditions · every bridge in St. Croix County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.