21 Mile RD over N Fk Crooked Creek 079
Fair Condition61 years old68 vehicles/day
Location
| State | Montana |
| County | Yellowstone |
| Location | 20m N Billings |
| Carries | 21 Mile RD |
| Crosses | N Fk Crooked Creek 079 |
| Coordinates | 46.07353, -108.50413 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 3 — Scour critical |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Tee Beam |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 23.0 ft (7 m) |
| Deck Width | 25.3 ft (7.7 m) |
| Deck Area | 56.2 sq m |
| Main Spans | 1 |
| Year Built | 1965 |
Traffic
| Avg Daily Traffic | 68 (2023) |
| Truck Traffic | 3% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 125 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | L56701018+03001 |