Sth 70 over Clam Lake Narrows
Burnett County, Wisconsin · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Sth 70 over Clam Lake Narrows in Burnett County, Wisconsin, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1993, making it 32 years old at the 2025 inventory.
- It carries about 4,400 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 35 of the 68 inventoried bridges in Burnett County rated fair (51.5%); 5 (7.4%) 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 September 2024, on a 24-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 → (45.81899, -92.3283)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 86 ft |
| Location | 1.8M E Jct Sth 35 to N |
| NBI structure number | B07003200000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2024 |
| Inspection interval (item 91) | 24 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 Burnett County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Sth 35 over Yellow River | 1986 | 5,600 | Poor |
| Sth 35 over Clam River | 2002 | 5,600 | Fair |
| Lrd North Oak Stre over Wood River | 1994 | 5,270 | Good |
| Sth 70 over Wood River | 2002 | 4,900 | Fair |
| Sth 70 over Wood River | 1993 | 4,200 | Good |
| Sth 70 over St Croix River 08 | 1991 | 4,100 | Fair |
All bridges nearby: Burnett County, WI bridge conditions · every bridge in Burnett County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.