SR 9 over Black Slough
Good Condition74 years old3,517 vehicles/day
Location
| State | Washington |
| County | Whatcom |
| Location | 9.7 N Skagit Co |
| Carries | SR 9 |
| Crosses | Black Slough |
| Coordinates | 48.77919, -122.20006 |
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 | Wood or Timber |
| Design | Slab |
| Total Length | 36.1 ft (11 m) |
| Max Span | 17.1 ft (5.2 m) |
| Deck Width | 29.9 ft (9.1 m) |
| Deck Area | 100.1 sq m |
| Main Spans | 2 |
| Year Built | 1952 (reconstructed 1978) |
Traffic
| Avg Daily Traffic | 3,517 (2023) |
| Truck Traffic | 15% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 523 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 0004281D0000000 |