S 21 over Int Midway I 15
Poor Condition54 years old540 vehicles/day
Location
| State | Montana |
| County | Pondera |
| Location | 3m SE Conrad |
| Carries | S 21 |
| Crosses | Int Midway I 15 |
| Coordinates | 48.13024, -111.90348 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 4 (Poor) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 349.1 ft (106.4 m) |
| Max Span | 105.6 ft (32.2 m) |
| Deck Width | 46.3 ft (14.1 m) |
| Deck Area | 1500.2 sq m |
| Main Spans | 4 |
| Year Built | 1972 |
Traffic
| Avg Daily Traffic | 540 (2023) |
| Truck Traffic | 6% |
| 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 | P00021000+00001 |