County Road 290 over Helena Valley Canal 085
Good Condition68 years old100 vehicles/day
Location
| State | Montana |
| County | Lewis and Clark |
| Location | N Of Helena Airport |
| Carries | County Road 290 |
| Crosses | Helena Valley Canal 085 |
| Coordinates | 46.61218, -111.96789 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Wood or Timber |
| Design | Stringer/Multi-beam |
| Total Length | 40.0 ft (12.2 m) |
| Max Span | 19.0 ft (5.8 m) |
| Deck Width | 25.3 ft (7.7 m) |
| Deck Area | 93.9 sq m |
| Main Spans | 2 |
| Year Built | 1958 |
Traffic
| Avg Daily Traffic | 100 (2025) |
| Truck Traffic | 3% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 225 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | M25058000+00201 |