| Reid Slough | King, WA | 22.4 miles | SW |
| Meadowbrook Slough | King, WA | 22.6 miles | SW |
| Horseshoe Slough | King, WA | 22.9 miles | SW |
| Rutherford Slough | King, WA | 23 miles | SW |
| Green Slough | King, WA | 23.1 miles | SW |
| Stickney Slough | King, WA | 23.9 miles | SW |
| Batt Slough | Snohomish, WA | 30.1 miles | NW |
| Hanson Slough | Snohomish, WA | 30.5 miles | NW |
| Deadman Slough | Snohomish, WA | 34.7 miles | NW |
| Deadwater Slough | Snohomish, WA | 34.9 miles | NW |
| Mercer Slough | King, WA | 35.4 miles | SW |
| Barnaby Slough | Skagit, WA | 49.5 miles | NW |
| Irvine Slough | Snohomish, WA | 52.2 miles | NW |
| Davis Slough | Island, WA | 53.7 miles | NW |
| Douglas Slough | Snohomish, WA | 54.4 miles | NW |
| Sullivan Slough | Skagit, WA | 63.1 miles | NW |
| Higgins Slough | Skagit, WA | 65.6 miles | NW |
| Telegraph Slough | Skagit, WA | 66.2 miles | NW |
| Blind Slough | Skagit, WA | 66.6 miles | NW |
| Siwash Slough | Skagit, WA | 72.2 miles | NW |
| Cap Sante Waterway | Skagit, WA | 72.9 miles | NW |
| Big Slough | Thurston, WA | 75.3 miles | SW |
| The Narrows | Mason, WA | 77.7 miles | SW |
| Siegels Slough | Okanogan, WA | 82.7 miles | NE |
| The Narrows | Mason, WA | 84.4 miles | SW |
| Purcell Slough | Lewis, WA | 87.4 miles | SW |
| Moran Slough | Grant, WA | 108.1 miles | SE |
|