US 20 over S Fork Madison River
Fair Condition17 years old4,666 vehicles/day
Location
| State | Montana |
| County | Gallatin |
| Location | 4m W West Yellowstone |
| Carries | US 20 |
| Crosses | S Fork Madison River |
| Coordinates | 44.67935, -111.19447 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 82.0 ft (25 m) |
| Max Span | 78.7 ft (24 m) |
| Deck Width | 41.3 ft (12.6 m) |
| Deck Area | 315 sq m |
| Main Spans | 1 |
| Year Built | 2009 |
Traffic
| Avg Daily Traffic | 4,666 (2023) |
| Truck Traffic | 9% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | P00012004+04611 |