| Greenleaf Slough | Skamania, WA | 24.4 miles | SW |
| Columbia Slough | Multnomah, OR | 50.7 miles | SW |
| Purcell Slough | Lewis, WA | 57.6 miles | NW |
| Mud Slough | Multnomah, OR | 59.7 miles | SW |
| Buckmire Slough | Clark, WA | 61.1 miles | SW |
| Bower Slough | Clark, WA | 62.1 miles | NW |
| Bachelor Island Slough | Clark, WA | 62.3 miles | NW |
| Wallace Slough | Cowlitz, WA | 63 miles | NW |
| Goerig Slough | Cowlitz, WA | 63.7 miles | NW |
| Broad Slough | Multnomah, OR | 63.9 miles | SW |
| Crane Slough | Columbia, OR | 64.1 miles | NW |
| Petes Slough | Columbia, OR | 64.1 miles | NW |
| Cunningham Slough | Columbia, OR | 64.6 miles | NW |
| Mud Slough | Multnomah, OR | 65.2 miles | SW |
| Ash Slough | Multnomah, OR | 65.9 miles | SW |
| Jack Slough | Multnomah, OR | 66.7 miles | SW |
| Benham Slough | Columbia, OR | 67.3 miles | NW |
| Deer Island Slough | Columbia, OR | 67.5 miles | NW |
| Daves Slough | Columbia, OR | 68 miles | NW |
| Marys Slough | Cowlitz, WA | 72.5 miles | NW |
| Ditch Number Three | Cowlitz, WA | 75.2 miles | NW |
| Ditch Number Five | Cowlitz, WA | 78 miles | NW |
| Cut-Off Slough | Cowlitz, WA | 79.6 miles | NW |
| Solo Slough | Cowlitz, WA | 80.6 miles | NW |
| John Slough | Columbia, OR | 85.6 miles | NW |
| Eldriedge Slough | Marion, OR | 85.7 miles | SW |
| Bradbury Slough | Columbia, OR | 86 miles | NW |
| Dobbins Slough | Columbia, OR | 86.2 miles | NW |
| Michigan Slough | Columbia, OR | 86.9 miles | NW |
| Poysky Slough | Columbia, OR | 88.1 miles | NW |
| Kinnunen Cut | Columbia, OR | 88.4 miles | NW |
| McCormach Slough | Morrow, OR | 91.9 miles | NE |
| Kelli Slough | Columbia, OR | 92.9 miles | NW |
| Randa Slough | Columbia, OR | 93.4 miles | NW |
| Paterson Slough | Benton, WA | 93.7 miles | NE |
| Kerry Slough | Columbia, OR | 94.2 miles | NW |
| Ludviksen Slough | Columbia, OR | 94.2 miles | NW |
| Cut-Off Slough | Wahkiakum, WA | 94.3 miles | NW |
| Net Rack Slough | Wahkiakum, WA | 94.5 miles | NW |
| Whiskey Joe Slough | Columbia, OR | 94.7 miles | NW |
| Jackson Inlet | Wahkiakum, WA | 94.9 miles | NW |
| Moran Slough | Grant, WA | 98.6 miles | NE |
| McAllister Slough | Crook, OR | 99.5 miles | SE |
| Red Slough | Clatsop, OR | 101.6 miles | NW |
| Cole Slough | Linn, OR | 105.3 miles | SW |
| Marks Slough | Linn, OR | 107.5 miles | SW |
| Big Slough | Thurston, WA | 113.9 miles | NW |
| Stewart Slough | Benton, OR | 116.3 miles | SW |
| Wright Slough | Linn, OR | 120 miles | SW |
| Clark Slough | Benton, OR | 122.4 miles | SW |
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