| Siwash Slough | Skagit, WA | 12.7 miles | SE |
| Cap Sante Waterway | Skagit, WA | 16.8 miles | SW |
| Telegraph Slough | Skagit, WA | 20.7 miles | SE |
| Blind Slough | Skagit, WA | 20.8 miles | SW |
| Higgins Slough | Skagit, WA | 21.3 miles | SE |
| Sullivan Slough | Skagit, WA | 25.1 miles | SE |
| Douglas Slough | Snohomish, WA | 33.6 miles | SE |
| Davis Slough | Island, WA | 35.2 miles | SE |
| Irvine Slough | Snohomish, WA | 35.6 miles | SE |
| Barnaby Slough | Skagit, WA | 46.9 miles | SE |
| Deadman Slough | Snohomish, WA | 54.5 miles | SE |
| Deadwater Slough | Snohomish, WA | 55.4 miles | SE |
| Hanson Slough | Snohomish, WA | 61.3 miles | SE |
| Batt Slough | Snohomish, WA | 61.8 miles | SE |
| Mercer Slough | King, WA | 82 miles | SE |
| Green Slough | King, WA | 82 miles | SE |
| Horseshoe Slough | King, WA | 82.1 miles | SE |
| Stickney Slough | King, WA | 83.2 miles | SE |
| Rutherford Slough | King, WA | 85.5 miles | SE |
| Meadowbrook Slough | King, WA | 90.6 miles | SE |
| Reid Slough | King, WA | 91.4 miles | SE |
| The Narrows | Mason, WA | 99.4 miles | SW |
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