S 431 over Greenfield Main Canal
Fair Condition67 years old285 vehicles/day
Location
| State | Montana |
| County | Teton |
| Location | 8m NE Fairfield |
| Carries | S 431 |
| Crosses | Greenfield Main Canal |
| Coordinates | 47.63974, -111.86225 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Wood or Timber |
| Design | Stringer/Multi-beam |
| Total Length | 59.1 ft (18 m) |
| Max Span | 19.0 ft (5.8 m) |
| Deck Width | 26.6 ft (8.1 m) |
| Deck Area | 145.8 sq m |
| Main Spans | 3 |
| Year Built | 1959 |
Traffic
| Avg Daily Traffic | 285 (2023) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | S00431004+08001 |