SR 9 over Black Slough
Good Condition126 years old3,517 vehicles/day
Location
| State | Washington |
| County | Whatcom |
| Location | 10.0 N Skagit Co |
| Carries | SR 9 |
| Crosses | Black Slough |
| Coordinates | 48.78222, -122.19444 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Slab |
| Total Length | 87.9 ft (26.8 m) |
| Max Span | 24.0 ft (7.3 m) |
| Deck Width | 40.0 ft (12.2 m) |
| Deck Area | 327.0 sq m |
| Main Spans | 4 |
| Year Built | 1900 (reconstructed 1952) |
Traffic
| Avg Daily Traffic | 3,517 (2023) |
| Truck Traffic | 15% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 724 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 0004328B0000000 |