Trewin School RD over Big Ditch 066
Fair Condition41 years old100 vehicles/day
Location
| State | Montana |
| County | Yellowstone |
| Location | 5m W Laurel |
| Carries | Trewin School RD |
| Crosses | Big Ditch 066 |
| Coordinates | 45.66684, -108.86378 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Tee Beam |
| Total Length | 50.9 ft (15.5 m) |
| Max Span | 47.9 ft (14.6 m) |
| Deck Width | 25.9 ft (7.9 m) |
| Deck Area | 122.5 sq m |
| Main Spans | 1 |
| Year Built | 1985 |
Traffic
| Avg Daily Traffic | 100 (2025) |
| 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 | L56543001+00001 |