| Cap Sante Waterway | Skagit, WA | 2.4 miles | NE |
| Blind Slough | Skagit, WA | 6.3 miles | SE |
| Telegraph Slough | Skagit, WA | 6.8 miles | SE |
| Higgins Slough | Skagit, WA | 7.2 miles | SE |
| Siwash Slough | Skagit, WA | 8.1 miles | NE |
| Sullivan Slough | Skagit, WA | 9.6 miles | SE |
| Douglas Slough | Snohomish, WA | 18.8 miles | SE |
| Davis Slough | Island, WA | 19.9 miles | SE |
| Irvine Slough | Snohomish, WA | 21 miles | SE |
| Deadman Slough | Snohomish, WA | 40.6 miles | SE |
| Deadwater Slough | Snohomish, WA | 41.2 miles | SE |
| Hanson Slough | Snohomish, WA | 47.2 miles | SE |
| Batt Slough | Snohomish, WA | 47.7 miles | SE |
| Barnaby Slough | Skagit, WA | 49.3 miles | SE |
| Mercer Slough | King, WA | 66 miles | SE |
| Green Slough | King, WA | 67.9 miles | SE |
| Horseshoe Slough | King, WA | 68 miles | SE |
| Stickney Slough | King, WA | 69 miles | SE |
| Rutherford Slough | King, WA | 71.5 miles | SE |
| Meadowbrook Slough | King, WA | 76.9 miles | SE |
| Reid Slough | King, WA | 77.8 miles | SE |
| The Narrows | Mason, WA | 80.5 miles | SW |
| The Narrows | Mason, WA | 94.1 miles | SW |
| Big Slough | Thurston, WA | 94.7 miles | SW |
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