Sth Th 23 over St Louis River
Douglas County, Wisconsin · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Sth Th 23 over St Louis River in Douglas 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 1919, making it 106 years old at the 2025 inventory.
- It carries about 1,650 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 54 of the 136 inventoried bridges in Douglas County rated fair (39.7%); 20 (14.7%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It does not appear under this structure number in the 2024 inventory (a new or renumbered structure).
- Its most recent inspection on record is dated September 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 → (46.65896, -92.28354)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 7 | Good condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete deck arch |
| Length | about 680 ft |
| Location | at Wisc State Line |
| NBI structure number | B16015800000000 |
| 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) | 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 Douglas County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 535 over St Louis R; RR Street | 1961 | 28,098 | Poor |
| Ush 2-ush 53-e 2ND over Nemadji River | 1989 | 23,300 | Fair |
| Ush 2-ush 53-e 2ND over Bluff Creek | 1989 | 23,300 | Good |
| Ush 2-ush 53-e 2ND over Lrd Service Road | 1989 | 20,400 | Good |
| Ush 53-e 2ND St over Lstt RR | 1962 | 19,500 | Fair |
| Ush 53-e 2ND St over Soo Line | 1962 | 19,500 | Fair |
All bridges nearby: Douglas County, WI bridge conditions · every bridge in Douglas County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.