| Siwash Slough | Skagit, WA | 3.1 miles | NW |
| Telegraph Slough | Skagit, WA | 8.3 miles | SW |
| Cap Sante Waterway | Skagit, WA | 8.5 miles | SW |
| Blind Slough | Skagit, WA | 8.8 miles | SW |
| Higgins Slough | Skagit, WA | 9 miles | SW |
| Sullivan Slough | Skagit, WA | 12.6 miles | SW |
| Douglas Slough | Snohomish, WA | 20.5 miles | SE |
| Davis Slough | Island, WA | 22.1 miles | SE |
| Irvine Slough | Snohomish, WA | 22.4 miles | SE |
| Barnaby Slough | Skagit, WA | 40.5 miles | SE |
| Deadman Slough | Snohomish, WA | 41.3 miles | SE |
| Deadwater Slough | Snohomish, WA | 42.2 miles | SE |
| Hanson Slough | Snohomish, WA | 48.1 miles | SE |
| Batt Slough | Snohomish, WA | 48.6 miles | SE |
| Mercer Slough | King, WA | 68.8 miles | SE |
| Green Slough | King, WA | 68.8 miles | SE |
| Horseshoe Slough | King, WA | 68.9 miles | SE |
| Stickney Slough | King, WA | 70.1 miles | SE |
| Rutherford Slough | King, WA | 72.4 miles | SE |
| Meadowbrook Slough | King, WA | 77.5 miles | SE |
| Reid Slough | King, WA | 78.3 miles | SE |
| The Narrows | Mason, WA | 88 miles | SW |
| Big Slough | Thurston, WA | 101 miles | SW |
| The Narrows | Mason, WA | 101.4 miles | SW |
|