| The Narrows | Mason, WA | 23.9 miles | SW |
| Mercer Slough | King, WA | 35.1 miles | SE |
| The Narrows | Mason, WA | 37.6 miles | SW |
| Big Slough | Thurston, WA | 40.2 miles | SE |
| Deadwater Slough | Snohomish, WA | 40.4 miles | NE |
| Hanson Slough | Snohomish, WA | 40.4 miles | NE |
| Batt Slough | Snohomish, WA | 40.6 miles | NE |
| Deadman Slough | Snohomish, WA | 41.6 miles | NE |
| Davis Slough | Island, WA | 45.2 miles | NE |
| Irvine Slough | Snohomish, WA | 45.9 miles | NE |
| Green Slough | King, WA | 46.5 miles | SE |
| Stickney Slough | King, WA | 46.5 miles | SE |
| Douglas Slough | Snohomish, WA | 46.7 miles | NE |
| Horseshoe Slough | King, WA | 46.9 miles | SE |
| Rutherford Slough | King, WA | 48.9 miles | SE |
| Sullivan Slough | Skagit, WA | 51.8 miles | NE |
| Meadowbrook Slough | King, WA | 53.6 miles | SE |
| Reid Slough | King, WA | 54.7 miles | SE |
| Higgins Slough | Skagit, WA | 55.3 miles | NE |
| Blind Slough | Skagit, WA | 55.6 miles | NE |
| Telegraph Slough | Skagit, WA | 56 miles | NE |
| Cap Sante Waterway | Skagit, WA | 58.7 miles | NE |
| Siwash Slough | Skagit, WA | 63.4 miles | NE |
| Cosmopolis Waterway | Grays Harbor, WA | 64.6 miles | SW |
| Ellis Slough | Pacific, WA | 79.4 miles | SW |
| Barnaby Slough | Skagit, WA | 83.6 miles | NE |
| Kindred Slough | Pacific, WA | 84.2 miles | SW |
| Cannery Slough | Pacific, WA | 85.2 miles | SW |
| Purcell Slough | Lewis, WA | 94.9 miles | SE |
| Roaring Creek Slough | Pacific, WA | 98 miles | SW |
| Greenhead Slough | Pacific, WA | 104.1 miles | SW |
| Parker Slough | Pacific, WA | 104.9 miles | SW |
| Parker Slough | Pacific, WA | 105.1 miles | SW |
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