Sth 77-silver St over Montreal River
Iron County, Wisconsin · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Sth 77-silver St over Montreal River in Iron 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 1965, making it 60 years old at the 2025 inventory.
- It carries about 4,900 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 23 of the 48 inventoried bridges in Iron County rated fair (47.9%); 2 (4.2%) 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 July 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 → (46.44992, -90.17846)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 50 ft |
| Location | 0.2M E Jct Ush 51 |
| NBI structure number | B26000900000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 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 Iron County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Lrd Poplar St over Montreal River | 2010 | 5,593 | Fair |
| Ush 2 over Soo Line/vaughn Creek | 1976 | 4,300 | Good |
| Ush 2 over W Br Montreal River | 1974 | 3,500 | Good |
| Ush 2 WB over Montreal River | 1961 | 3,000 | Fair |
| Ush 2 EB over Montreal River | 1961 | 3,000 | Fair |
| Ush 51 over Laymans Creek | 1994 | 2,900 | Fair |
All bridges nearby: Iron County, WI bridge conditions · every bridge in Iron County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.