S 21 over Rr
Good Condition54 years old1,725 vehicles/day
Location
| State | Montana |
| County | Pondera |
| Location | Conrad |
| Carries | S 21 |
| Crosses | Rr |
| Coordinates | 48.18061, -111.93788 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 222.8 ft (67.9 m) |
| Max Span | 77.1 ft (23.5 m) |
| Deck Width | 50.5 ft (15.4 m) |
| Deck Area | 1045.7 sq m |
| Main Spans | 3 |
| Year Built | 1972 |
Traffic
| Avg Daily Traffic | 1,725 (2023) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 225 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | P00021005+00501 |