SR 409 over Birnie Slough
Fair Condition79 years old906 vehicles/day
Location
| State | Washington |
| County | Wahkiakum |
| Location | 1.8 N Ferry Dock |
| Carries | SR 409 |
| Crosses | Birnie Slough |
| Coordinates | 46.17950, -123.37708 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 192.9 ft (58.8 m) |
| Max Span | 60.0 ft (18.3 m) |
| Deck Width | 32.5 ft (9.9 m) |
| Deck Area | 582.1 sq m |
| Main Spans | 5 |
| Year Built | 1947 |
Traffic
| Avg Daily Traffic | 906 (2023) |
| Truck Traffic | 6% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 424 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 0003264A0000000 |