Cth B over Round Lake Narrows
Sawyer County, Wisconsin · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Cth B over Round Lake Narrows in Sawyer County, Wisconsin, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1986, making it 39 years old at the 2025 inventory.
- It carries about 2,296 vehicles a day (traffic count year 2024).
- Its listed owner is the county highway agency.
- It is one of 45 of the 98 inventoried bridges in Sawyer County rated fair (45.9%); 17 (17.3%) 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 August 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 → (45.98944, -91.31583)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Timber slab |
| Length | about 29 ft |
| Location | 1.0M E Jct Cth Nn |
| NBI structure number | P57092400000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Wisconsin department of transportation.
Busiest bridges in Sawyer County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Sth 27 over Namekagon River | 1996 | 13,500 | Poor |
| Sth 77 over Namekagon River | 2000 | 6,200 | Fair |
| Ush 63 over Namekagon River | 1976 | 3,900 | Good |
| Cth B over Chief River | 1988 | 1,803 | Good |
| Sth 27 over Nail Creek | 1990 | 1,600 | Good |
| Sth 27 over Brunet River | 1990 | 1,600 | Good |
All bridges nearby: Sawyer County, WI bridge conditions · every bridge in Sawyer County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.