| Reid Slough | King, WA | 33.2 miles | NE |
| Meadowbrook Slough | King, WA | 33.3 miles | NE |
| Big Slough | Thurston, WA | 34.5 miles | NW |
| Mercer Slough | King, WA | 35.8 miles | NW |
| Rutherford Slough | King, WA | 36 miles | NE |
| Stickney Slough | King, WA | 37.3 miles | NE |
| Purcell Slough | Lewis, WA | 38.5 miles | SE |
| Horseshoe Slough | King, WA | 38.7 miles | NE |
| Green Slough | King, WA | 38.7 miles | NE |
| The Narrows | Mason, WA | 47.1 miles | NW |
| The Narrows | Mason, WA | 50.2 miles | NW |
| Batt Slough | Snohomish, WA | 56.9 miles | NW |
| Hanson Slough | Snohomish, WA | 57.4 miles | NW |
| Deadwater Slough | Snohomish, WA | 63 miles | NW |
| Deadman Slough | Snohomish, WA | 64.1 miles | NW |
| Cut-Off Slough | Cowlitz, WA | 77 miles | SW |
| Marys Slough | Cowlitz, WA | 77.3 miles | SW |
| Solo Slough | Cowlitz, WA | 77.6 miles | SW |
| Ditch Number Five | Cowlitz, WA | 78.1 miles | SW |
| Ditch Number Three | Cowlitz, WA | 78.4 miles | SW |
| Bradbury Slough | Columbia, OR | 81.2 miles | SW |
| John Slough | Columbia, OR | 81.5 miles | SW |
| Cosmopolis Waterway | Grays Harbor, WA | 81.9 miles | SW |
| Irvine Slough | Snohomish, WA | 82.2 miles | NW |
| Davis Slough | Island, WA | 82.7 miles | NW |
| Dobbins Slough | Columbia, OR | 82.8 miles | SW |
| Poysky Slough | Columbia, OR | 83.2 miles | SW |
| Ellis Slough | Pacific, WA | 83.5 miles | SW |
| Douglas Slough | Snohomish, WA | 84.2 miles | NW |
| Michigan Slough | Columbia, OR | 84.9 miles | SW |
| Daves Slough | Columbia, OR | 85.3 miles | SW |
| Kinnunen Cut | Columbia, OR | 85.9 miles | SW |
| Deer Island Slough | Columbia, OR | 86.6 miles | SW |
| Benham Slough | Columbia, OR | 87.2 miles | SW |
| Jackson Inlet | Wahkiakum, WA | 88 miles | SW |
| Cut-Off Slough | Wahkiakum, WA | 88.3 miles | SW |
| Goerig Slough | Cowlitz, WA | 88.3 miles | SW |
| Red Slough | Clatsop, OR | 88.4 miles | SW |
| Net Rack Slough | Wahkiakum, WA | 88.7 miles | SW |
| Kelli Slough | Columbia, OR | 89.1 miles | SW |
| Randa Slough | Columbia, OR | 89.2 miles | SW |
| Wallace Slough | Cowlitz, WA | 89.3 miles | SW |
| Ludviksen Slough | Columbia, OR | 89.5 miles | SW |
| Whiskey Joe Slough | Columbia, OR | 89.7 miles | SW |
| Kerry Slough | Columbia, OR | 90.1 miles | SW |
| Marsh Island Creek | Clatsop, OR | 92.9 miles | SW |
| Sullivan Slough | Skagit, WA | 93.1 miles | NW |
| Cunningham Slough | Columbia, OR | 93.4 miles | SW |
| Bachelor Island Slough | Clark, WA | 93.6 miles | SW |
| Bower Slough | Clark, WA | 94.2 miles | SW |
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