| Name | Location | Status | Design | Year Built | Year Lost | Span Length | Total Length |
|---|
| Baker River Bridge | Old WA 20 over Baker River | Open to traffic | Arch | 1916 | -- | 195.9 ft. | 269.0 ft. |
| Canoe Pass Bridge | WA 20 over Canoe Pass | Open to traffic | Steel arch | 1935 | -- | 350.1 ft. | 511.2 ft. |
| Cascade River Road Bridge | Cascade River Road over Skagit River | Open to traffic | Through truss | 1930 | -- | 279.9 ft. | 662.1 ft. |
| Concrete Sauk Valley Road Bridge | Concrete Sauk Valley Road over Sauk River | Open to traffic | Truss | 1930 | -- | -- | 304.1 ft. |
| Dalles Bridge | Concrete Sauk Valley Road over Skagit River | Open to traffic | Through truss | 1952 | -- | 299.9 ft. | 505.9 ft. |
| Rainbow Bridge | Pioneer Parkway over Swinomish Slough | Open to traffic | Steel through arch | 1957 | -- | 580.1 ft. | 797.0 ft. |
| Riverside Drive Bridge | Riverside Drive over Skagit River | Open to traffic | Other | 1938 | -- | -- | 795.0 ft. |
| Samish River Bridge | WA 11 over Samish River | Open to traffic | Arch | 1920 | -- | 75.1 ft. | 75.1 ft. |
| Samish River Bridge | Burl. Alger Road over Samish River | Open to traffic | Through truss | 1934 | -- | 142.1 ft. | 384.9 ft. |
| Sauk River Bridge | WA 530 over Sauk River | Open to traffic | Through truss | 1958 | -- | 220.2 ft. | 501.0 ft. |
| Skagit River Bridge | WA 536 over Skagit River | Open to traffic | Other | 1953 | -- | 160.1 ft. | 674.9 ft. |
| Skagit River Bridge | I-5 over Skagit River | Open to traffic | Through truss | 1955 | -- | 160.1 ft. | 1111.9 ft. |
| Skagit River Bridge | WA 9 over Skagit River | Open to traffic | Through truss | 1959 | -- | 299.9 ft. | 972.2 ft. |
| West Fork Nookachamps Creek Bridge | WA 9 over West Fork Nookachamps Creek | Open to traffic | Arch | 1920 | -- | 109.9 ft. | 223.1 ft. |