| Mercer Slough | King, WA | 7.2 miles | SE |
| Stickney Slough | King, WA | 18.7 miles | SE |
| Green Slough | King, WA | 18.9 miles | NE |
| Horseshoe Slough | King, WA | 19.3 miles | NE |
| Rutherford Slough | King, WA | 20.9 miles | SE |
| Batt Slough | Snohomish, WA | 22.2 miles | NE |
| Hanson Slough | Snohomish, WA | 22.4 miles | NE |
| Meadowbrook Slough | King, WA | 25.6 miles | SE |
| Deadwater Slough | Snohomish, WA | 26.5 miles | NE |
| Reid Slough | King, WA | 26.7 miles | SE |
| Deadman Slough | Snohomish, WA | 27.8 miles | NE |
| The Narrows | Mason, WA | 37 miles | SW |
| Big Slough | Thurston, WA | 39.8 miles | SW |
| Irvine Slough | Snohomish, WA | 43.5 miles | NW |
| Davis Slough | Island, WA | 43.8 miles | NW |
| Douglas Slough | Snohomish, WA | 45.3 miles | NW |
| The Narrows | Mason, WA | 45.8 miles | SW |
| Sullivan Slough | Skagit, WA | 53.8 miles | NW |
| Higgins Slough | Skagit, WA | 57.6 miles | NW |
| Blind Slough | Skagit, WA | 58.2 miles | NW |
| Telegraph Slough | Skagit, WA | 58.3 miles | NW |
| Cap Sante Waterway | Skagit, WA | 63.5 miles | NW |
| Siwash Slough | Skagit, WA | 66.2 miles | NW |
| Barnaby Slough | Skagit, WA | 70.2 miles | NE |
| Purcell Slough | Lewis, WA | 78.2 miles | SE |
| Cosmopolis Waterway | Grays Harbor, WA | 81.3 miles | SW |
| Ellis Slough | Pacific, WA | 91.6 miles | SW |
| Kindred Slough | Pacific, WA | 99.7 miles | SW |
| Cannery Slough | Pacific, WA | 101 miles | SW |
| Cut-Off Slough | Cowlitz, WA | 104.5 miles | SW |
| Solo Slough | Cowlitz, WA | 104.7 miles | SW |
| Bradbury Slough | Columbia, OR | 106.7 miles | SW |
| Poysky Slough | Columbia, OR | 108.1 miles | SW |
| Red Slough | Clatsop, OR | 108.9 miles | SW |
| Roaring Creek Slough | Pacific, WA | 108.9 miles | SW |
| Jackson Inlet | Wahkiakum, WA | 110.9 miles | SW |
| Marsh Island Creek | Clatsop, OR | 112.2 miles | SW |
| Greenhead Slough | Pacific, WA | 115.4 miles | SW |
| Parker Slough | Pacific, WA | 116.6 miles | SW |
| Parker Slough | Pacific, WA | 116.8 miles | SW |
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