Mt 21 over Fort Shaw Canal 110
Fair Condition92 years old421 vehicles/day
Location
| State | Montana |
| County | Cascade |
| Location | 3m W Simms |
| Carries | Mt 21 |
| Crosses | Fort Shaw Canal 110 |
| Coordinates | 47.49509, -111.98175 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete |
| Design | Tee Beam |
| Total Length | 39.0 ft (11.9 m) |
| Max Span | 39.0 ft (11.9 m) |
| Deck Width | 24.9 ft (7.6 m) |
| Deck Area | 90.4 sq m |
| Main Spans | 1 |
| Year Built | 1934 |
Traffic
| Avg Daily Traffic | 421 (2023) |
| Truck Traffic | 3% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | December 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | L07561003+04001 |