| Siwash Slough | Skagit, WA | 15.9 miles | SW |
| Telegraph Slough | Skagit, WA | 21 miles | SW |
| Blind Slough | Skagit, WA | 21.5 miles | SW |
| Higgins Slough | Skagit, WA | 21.5 miles | SW |
| Cap Sante Waterway | Skagit, WA | 21.8 miles | SW |
| Sullivan Slough | Skagit, WA | 24.6 miles | SW |
| Douglas Slough | Snohomish, WA | 30.1 miles | SW |
| Irvine Slough | Snohomish, WA | 31.6 miles | SW |
| Davis Slough | Island, WA | 31.8 miles | SW |
| Barnaby Slough | Skagit, WA | 32.7 miles | SE |
| Deadman Slough | Snohomish, WA | 47.7 miles | SE |
| Deadwater Slough | Snohomish, WA | 48.9 miles | SE |
| Hanson Slough | Snohomish, WA | 54.4 miles | SE |
| Batt Slough | Snohomish, WA | 54.9 miles | SE |
| Green Slough | King, WA | 74.3 miles | SE |
| Horseshoe Slough | King, WA | 74.4 miles | SE |
| Stickney Slough | King, WA | 75.6 miles | SE |
| Mercer Slough | King, WA | 76.4 miles | SE |
| Rutherford Slough | King, WA | 77.7 miles | SE |
| Meadowbrook Slough | King, WA | 82.4 miles | SE |
| Reid Slough | King, WA | 83.1 miles | SE |
| Siegels Slough | Okanogan, WA | 89.8 miles | SE |
| The Narrows | Mason, WA | 99.6 miles | SW |
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