| Green Slough | King, WA | 2.4 miles | SW |
| Horseshoe Slough | King, WA | 2.4 miles | SW |
| Stickney Slough | King, WA | 3.9 miles | SW |
| Rutherford Slough | King, WA | 5.6 miles | SE |
| Meadowbrook Slough | King, WA | 10.8 miles | SE |
| Reid Slough | King, WA | 11.7 miles | SE |
| Mercer Slough | King, WA | 13.9 miles | SW |
| Batt Slough | Snohomish, WA | 18.4 miles | NW |
| Hanson Slough | Snohomish, WA | 19 miles | NW |
| Deadwater Slough | Snohomish, WA | 24.9 miles | NW |
| Deadman Slough | Snohomish, WA | 25.7 miles | NW |
| Irvine Slough | Snohomish, WA | 45.3 miles | NW |
| Davis Slough | Island, WA | 46.2 miles | NW |
| Douglas Slough | Snohomish, WA | 47.5 miles | NW |
| Big Slough | Thurston, WA | 54.9 miles | SW |
| The Narrows | Mason, WA | 56.2 miles | SW |
| Sullivan Slough | Skagit, WA | 56.7 miles | NW |
| Barnaby Slough | Skagit, WA | 59.4 miles | NE |
| Higgins Slough | Skagit, WA | 60.1 miles | NW |
| Telegraph Slough | Skagit, WA | 60.8 miles | NW |
| Blind Slough | Skagit, WA | 60.9 miles | NW |
| The Narrows | Mason, WA | 63.2 miles | SW |
| Cap Sante Waterway | Skagit, WA | 67 miles | NW |
| Siwash Slough | Skagit, WA | 68.1 miles | NW |
| Purcell Slough | Lewis, WA | 78.1 miles | SE |
| Cosmopolis Waterway | Grays Harbor, WA | 99.8 miles | SW |
| Siegels Slough | Okanogan, WA | 102.5 miles | NE |
| Ellis Slough | Pacific, WA | 108.5 miles | SW |
| Kindred Slough | Pacific, WA | 117.6 miles | SW |
| Moran Slough | Grant, WA | 118.6 miles | SE |
| Red Slough | Clatsop, OR | 122.4 miles | SW |
| Roaring Creek Slough | Pacific, WA | 124.9 miles | SW |
| Marsh Island Creek | Clatsop, OR | 126.2 miles | SW |
| Greenhead Slough | Pacific, WA | 131.5 miles | SW |
| Parker Slough | Pacific, WA | 132.9 miles | SW |
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