Old Darby RD over Bitterroot River 074
Fair Condition109 years old289 vehicles/day
Location
| State | Montana |
| County | Ravalli |
| Location | 5m N Darby |
| Carries | Old Darby RD |
| Crosses | Bitterroot River 074 |
| Coordinates | 46.09248, -114.17561 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Truss - Thru |
| Total Length | 164.0 ft (50 m) |
| Max Span | 160.1 ft (48.8 m) |
| Deck Width | 15.4 ft (4.7 m) |
| Deck Area | 235 sq m |
| Main Spans | 1 |
| Year Built | 1917 (reconstructed 2001) |
Traffic
| Avg Daily Traffic | 289 (2023) |
| Lanes On Bridge | 1 |
Inspection & Ownership
| Last Inspection | 623 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | L41600000+01001 |