SR 20 over Thornton Creek
Good Condition46 years old1,930 vehicles/day
Location
| State | Washington |
| County | Whatcom |
| Location | 0.6 E Skagit Co |
| Carries | SR 20 |
| Crosses | Thornton Creek |
| Coordinates | 48.64864, -121.30475 |
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 | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 100.1 ft (30.5 m) |
| Max Span | 97.4 ft (29.7 m) |
| Deck Width | 39.4 ft (12 m) |
| Deck Area | 366 sq m |
| Main Spans | 1 |
| Year Built | 1980 |
Traffic
| Avg Daily Traffic | 1,930 (2023) |
| Truck Traffic | 7% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 624 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000QS0000000 |