Old HWY 312 over Yellowstone River 170
Poor Condition77 years old4,005 vehicles/day
Location
| State | Montana |
| County | Yellowstone |
| Location | Huntley |
| Carries | Old HWY 312 |
| Crosses | Yellowstone River 170 |
| Coordinates | 45.90392, -108.31855 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 4 (Poor) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 3 — Scour critical |
Physical Characteristics
| Material | Steel Continuous |
| Design | Girder and Floorbeam |
| Total Length | 1022.0 ft (311.5 m) |
| Max Span | 185.0 ft (56.4 m) |
| Deck Width | 33.8 ft (10.3 m) |
| Deck Area | 3208.4 sq m |
| Main Spans | 6 |
| Year Built | 1949 |
Traffic
| Avg Daily Traffic | 4,005 (2023) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 723 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | L56788012+07001 |