| Mercer Slough | King, WA | 15.7 miles | NE |
| The Narrows | Mason, WA | 26.8 miles | SW |
| Stickney Slough | King, WA | 27.3 miles | NE |
| Big Slough | Thurston, WA | 27.5 miles | SW |
| Green Slough | King, WA | 28 miles | NE |
| Horseshoe Slough | King, WA | 28.2 miles | NE |
| Rutherford Slough | King, WA | 28.7 miles | NE |
| Meadowbrook Slough | King, WA | 31.9 miles | NE |
| Reid Slough | King, WA | 32.9 miles | NE |
| The Narrows | Mason, WA | 34 miles | SW |
| Batt Slough | Snohomish, WA | 34.5 miles | NE |
| Hanson Slough | Snohomish, WA | 34.6 miles | NE |
| Deadwater Slough | Snohomish, WA | 38.4 miles | NE |
| Deadman Slough | Snohomish, WA | 39.8 miles | NE |
| Irvine Slough | Snohomish, WA | 53.9 miles | NE |
| Davis Slough | Island, WA | 54 miles | NE |
| Douglas Slough | Snohomish, WA | 55.6 miles | NE |
| Sullivan Slough | Skagit, WA | 63.6 miles | NW |
| Higgins Slough | Skagit, WA | 67.4 miles | NW |
| Blind Slough | Skagit, WA | 67.9 miles | NW |
| Telegraph Slough | Skagit, WA | 68.1 miles | NW |
| Cosmopolis Waterway | Grays Harbor, WA | 70.2 miles | SW |
| Purcell Slough | Lewis, WA | 71.1 miles | SE |
| Cap Sante Waterway | Skagit, WA | 72.8 miles | NW |
| Siwash Slough | Skagit, WA | 76 miles | NW |
| Ellis Slough | Pacific, WA | 79.7 miles | SW |
| Barnaby Slough | Skagit, WA | 82.4 miles | NE |
| Kindred Slough | Pacific, WA | 88.2 miles | SW |
| Cannery Slough | Pacific, WA | 89.6 miles | SW |
| Cut-Off Slough | Cowlitz, WA | 92.7 miles | SW |
| Solo Slough | Cowlitz, WA | 92.9 miles | SW |
| Ditch Number Five | Cowlitz, WA | 94.5 miles | SW |
| Bradbury Slough | Columbia, OR | 94.8 miles | SW |
| John Slough | Columbia, OR | 95.2 miles | SW |
| Marys Slough | Cowlitz, WA | 95.5 miles | SW |
| Ditch Number Three | Cowlitz, WA | 95.6 miles | SW |
| Poysky Slough | Columbia, OR | 96.1 miles | SW |
| Dobbins Slough | Columbia, OR | 96.4 miles | SW |
| Red Slough | Clatsop, OR | 96.7 miles | SW |
| Roaring Creek Slough | Pacific, WA | 96.8 miles | SW |
| Michigan Slough | Columbia, OR | 98.4 miles | SW |
| Jackson Inlet | Wahkiakum, WA | 98.8 miles | SW |
| Kinnunen Cut | Columbia, OR | 98.9 miles | SW |
| Cut-Off Slough | Wahkiakum, WA | 99.4 miles | SW |
| Net Rack Slough | Wahkiakum, WA | 99.7 miles | SW |
| Marsh Island Creek | Clatsop, OR | 100 miles | SW |
| Whiskey Joe Slough | Columbia, OR | 100.7 miles | SW |
| Randa Slough | Columbia, OR | 100.7 miles | SW |
| Kelli Slough | Columbia, OR | 100.8 miles | SW |
| Ludviksen Slough | Columbia, OR | 100.8 miles | SW |
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