S 21 over Int Conrad I 15
Fair Condition54 years old100 vehicles/day
Location
| State | Montana |
| County | Pondera |
| Location | Conrad |
| Carries | S 21 |
| Crosses | Int Conrad I 15 |
| Coordinates | 48.18132, -111.93544 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 8 (Very Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 371.1 ft (113.1 m) |
| Max Span | 122.0 ft (37.2 m) |
| Deck Width | 50.2 ft (15.3 m) |
| Deck Area | 1730.4 sq m |
| Main Spans | 2 |
| Year Built | 1972 |
Traffic
| Avg Daily Traffic | 100 (2025) |
| Truck Traffic | 3% |
| Lanes On Bridge | 2 |
| Lanes Under Bridge | 4 |
Inspection & Ownership
| Last Inspection | 623 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | P00021005+01641 |