IRR - S 66 over Three Mile Coulee
Fair Condition67 years old763 vehicles/day
Location
| State | Montana |
| County | Blaine |
| Location | 3m S Fort Belknap Agency |
| Carries | IRR - S 66 |
| Crosses | Three Mile Coulee |
| Coordinates | 48.44494, -108.74176 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Wood or Timber |
| Design | Stringer/Multi-beam |
| Total Length | 100.1 ft (30.5 m) |
| Max Span | 24.9 ft (7.6 m) |
| Deck Width | 29.9 ft (9.1 m) |
| Deck Area | 277.6 sq m |
| Main Spans | 4 |
| Year Built | 1959 |
Traffic
| Avg Daily Traffic | 763 (2023) |
| Truck Traffic | 4% |
| Lanes On Bridge | 2 |
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 | P00066047+02171 |