S 359 over South Boulder River
Fair Condition68 years old1,429 vehicles/day
Location
| State | Montana |
| County | Madison |
| Location | 3m S Jefferson Island |
| Carries | S 359 |
| Crosses | South Boulder River |
| Coordinates | 45.80570, -111.92782 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Wood or Timber |
| Design | Stringer/Multi-beam |
| Total Length | 49.9 ft (15.2 m) |
| Max Span | 24.9 ft (7.6 m) |
| Deck Width | 25.9 ft (7.9 m) |
| Deck Area | 120.1 sq m |
| Main Spans | 2 |
| Year Built | 1958 |
Traffic
| Avg Daily Traffic | 1,429 (2023) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 924 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | S00359006+02091 |