| Meadowbrook Slough | King, WA | 28.2 miles | NE |
| Reid Slough | King, WA | 28.2 miles | NE |
| Mercer Slough | King, WA | 29.6 miles | NW |
| Rutherford Slough | King, WA | 30.4 miles | NE |
| Stickney Slough | King, WA | 31.5 miles | NE |
| Green Slough | King, WA | 32.9 miles | NE |
| Horseshoe Slough | King, WA | 33 miles | NE |
| Big Slough | Thurston, WA | 33.2 miles | SW |
| Purcell Slough | Lewis, WA | 44.7 miles | SE |
| The Narrows | Mason, WA | 45.5 miles | SW |
| The Narrows | Mason, WA | 46.9 miles | NW |
| Batt Slough | Snohomish, WA | 50.8 miles | NW |
| Hanson Slough | Snohomish, WA | 51.2 miles | NW |
| Deadwater Slough | Snohomish, WA | 56.8 miles | NW |
| Deadman Slough | Snohomish, WA | 57.9 miles | NW |
| Irvine Slough | Snohomish, WA | 76 miles | NW |
| Davis Slough | Island, WA | 76.5 miles | NW |
| Douglas Slough | Snohomish, WA | 78 miles | NW |
| Cut-Off Slough | Cowlitz, WA | 81.3 miles | SW |
| Cosmopolis Waterway | Grays Harbor, WA | 81.4 miles | SW |
| Solo Slough | Cowlitz, WA | 81.8 miles | SW |
| Marys Slough | Cowlitz, WA | 82 miles | SW |
| Ditch Number Five | Cowlitz, WA | 82.5 miles | SW |
| Ditch Number Three | Cowlitz, WA | 82.9 miles | SW |
| Ellis Slough | Pacific, WA | 84.4 miles | SW |
| Bradbury Slough | Columbia, OR | 85.1 miles | SW |
| John Slough | Columbia, OR | 85.5 miles | SW |
| Dobbins Slough | Columbia, OR | 86.8 miles | SW |
| Sullivan Slough | Skagit, WA | 86.9 miles | NW |
| Poysky Slough | Columbia, OR | 87 miles | SW |
| Michigan Slough | Columbia, OR | 88.9 miles | SW |
| Kinnunen Cut | Columbia, OR | 89.8 miles | SW |
| Daves Slough | Columbia, OR | 90.2 miles | SW |
| Higgins Slough | Skagit, WA | 90.6 miles | NW |
| Blind Slough | Skagit, WA | 91.3 miles | NW |
| Telegraph Slough | Skagit, WA | 91.3 miles | NW |
| Jackson Inlet | Wahkiakum, WA | 91.5 miles | SW |
| Red Slough | Clatsop, OR | 91.5 miles | SW |
| Deer Island Slough | Columbia, OR | 91.6 miles | SW |
| Cut-Off Slough | Wahkiakum, WA | 91.9 miles | SW |
| Net Rack Slough | Wahkiakum, WA | 92.2 miles | SW |
| Benham Slough | Columbia, OR | 92.2 miles | SW |
| Kelli Slough | Columbia, OR | 92.8 miles | SW |
| Randa Slough | Columbia, OR | 92.8 miles | SW |
| Ludviksen Slough | Columbia, OR | 93.2 miles | SW |
| Whiskey Joe Slough | Columbia, OR | 93.3 miles | SW |
| Goerig Slough | Cowlitz, WA | 93.4 miles | SW |
| Kerry Slough | Columbia, OR | 93.7 miles | SW |
| Wallace Slough | Cowlitz, WA | 94.5 miles | SW |
| Barnaby Slough | Skagit, WA | 94.7 miles | NE |
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