| Greenleaf Slough | Skamania, WA | 35.4 miles | SW |
| Purcell Slough | Lewis, WA | 54.9 miles | NW |
| Columbia Slough | Multnomah, OR | 61.4 miles | SW |
| Mud Slough | Multnomah, OR | 70.1 miles | SW |
| Buckmire Slough | Clark, WA | 70.9 miles | SW |
| Bower Slough | Clark, WA | 71.1 miles | SW |
| Bachelor Island Slough | Clark, WA | 71.3 miles | SW |
| Wallace Slough | Cowlitz, WA | 71.4 miles | NW |
| Goerig Slough | Cowlitz, WA | 72 miles | NW |
| Crane Slough | Columbia, OR | 73.3 miles | SW |
| Cunningham Slough | Columbia, OR | 73.4 miles | SW |
| Petes Slough | Columbia, OR | 73.4 miles | SW |
| Broad Slough | Multnomah, OR | 73.7 miles | SW |
| Mud Slough | Multnomah, OR | 75 miles | SW |
| Benham Slough | Columbia, OR | 75.3 miles | NW |
| Deer Island Slough | Columbia, OR | 75.5 miles | NW |
| Daves Slough | Columbia, OR | 75.7 miles | NW |
| Ash Slough | Multnomah, OR | 75.7 miles | SW |
| Jack Slough | Multnomah, OR | 76.3 miles | SW |
| Marys Slough | Cowlitz, WA | 79.1 miles | NW |
| Ditch Number Three | Cowlitz, WA | 81.9 miles | NW |
| McCormach Slough | Morrow, OR | 82.1 miles | NE |
| Paterson Slough | Benton, WA | 83.8 miles | NE |
| Ditch Number Five | Cowlitz, WA | 84.5 miles | NW |
| Cut-Off Slough | Cowlitz, WA | 85.9 miles | NW |
| Solo Slough | Cowlitz, WA | 87 miles | NW |
| Moran Slough | Grant, WA | 87.1 miles | NE |
| John Slough | Columbia, OR | 92.2 miles | NW |
| Bradbury Slough | Columbia, OR | 92.6 miles | NW |
| Dobbins Slough | Columbia, OR | 92.9 miles | NW |
| Michigan Slough | Columbia, OR | 93.9 miles | NW |
| Poysky Slough | Columbia, OR | 94.9 miles | NW |
| Kinnunen Cut | Columbia, OR | 95.4 miles | NW |
| Eldriedge Slough | Marion, OR | 97.1 miles | SW |
| Big Slough | Thurston, WA | 113.5 miles | NW |
| Cole Slough | Linn, OR | 116.8 miles | SW |
| Marks Slough | Linn, OR | 118.8 miles | SW |
| The Narrows | Mason, WA | 123.5 miles | NW |
| Stewart Slough | Benton, OR | 127.8 miles | SW |
| Wright Slough | Linn, OR | 131.3 miles | SW |
| Clark Slough | Benton, OR | 133.8 miles | SW |
| McBee Slough | Benton, OR | 134.2 miles | SW |
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