| Mercer Slough | King, WA | 20.8 miles | SE |
| The Narrows | Mason, WA | 25.6 miles | SW |
| Hanson Slough | Snohomish, WA | 31.5 miles | NE |
| Batt Slough | Snohomish, WA | 31.5 miles | NE |
| Stickney Slough | King, WA | 32.6 miles | SE |
| Green Slough | King, WA | 32.8 miles | NE |
| Horseshoe Slough | King, WA | 33.2 miles | NE |
| Deadwater Slough | Snohomish, WA | 33.4 miles | NE |
| Big Slough | Thurston, WA | 34.5 miles | SW |
| Deadman Slough | Snohomish, WA | 34.8 miles | NE |
| Rutherford Slough | King, WA | 34.8 miles | SE |
| The Narrows | Mason, WA | 36.9 miles | SW |
| Meadowbrook Slough | King, WA | 39.2 miles | SE |
| Reid Slough | King, WA | 40.4 miles | SE |
| Davis Slough | Island, WA | 45.1 miles | NE |
| Irvine Slough | Snohomish, WA | 45.3 miles | NE |
| Douglas Slough | Snohomish, WA | 46.7 miles | NE |
| Sullivan Slough | Skagit, WA | 53.9 miles | NE |
| Higgins Slough | Skagit, WA | 57.6 miles | NE |
| Blind Slough | Skagit, WA | 58.1 miles | NE |
| Telegraph Slough | Skagit, WA | 58.3 miles | NE |
| Cap Sante Waterway | Skagit, WA | 62.5 miles | NE |
| Siwash Slough | Skagit, WA | 66.2 miles | NE |
| Cosmopolis Waterway | Grays Harbor, WA | 70 miles | SW |
| Barnaby Slough | Skagit, WA | 78.3 miles | NE |
| Ellis Slough | Pacific, WA | 82.2 miles | SW |
| Purcell Slough | Lewis, WA | 83.3 miles | SE |
| Kindred Slough | Pacific, WA | 89 miles | SW |
| Cannery Slough | Pacific, WA | 90.3 miles | SW |
| Roaring Creek Slough | Pacific, WA | 100.1 miles | SW |
| Cut-Off Slough | Cowlitz, WA | 101 miles | SW |
| Solo Slough | Cowlitz, WA | 101.1 miles | SW |
| Bradbury Slough | Columbia, OR | 102.4 miles | SW |
| Red Slough | Clatsop, OR | 102.6 miles | SW |
| John Slough | Columbia, OR | 102.9 miles | SW |
| Poysky Slough | Columbia, OR | 103.5 miles | SW |
| Marsh Island Creek | Clatsop, OR | 105.5 miles | SW |
| Jackson Inlet | Wahkiakum, WA | 105.5 miles | SW |
| Greenhead Slough | Pacific, WA | 106.5 miles | SW |
| Parker Slough | Pacific, WA | 107.6 miles | SW |
| Parker Slough | Pacific, WA | 107.8 miles | SW |
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