| Columbia Slough | Multnomah, OR | 6.7 miles | NW |
| Mud Slough | Multnomah, OR | 17 miles | NW |
| Greenleaf Slough | Skamania, WA | 20.8 miles | NE |
| Buckmire Slough | Clark, WA | 21.4 miles | NW |
| Broad Slough | Multnomah, OR | 24.1 miles | NW |
| Mud Slough | Multnomah, OR | 24.8 miles | NW |
| Ash Slough | Multnomah, OR | 25.3 miles | NW |
| Petes Slough | Columbia, OR | 26.7 miles | NW |
| Bower Slough | Clark, WA | 26.8 miles | NW |
| Jack Slough | Multnomah, OR | 26.9 miles | NW |
| Bachelor Island Slough | Clark, WA | 27.5 miles | NW |
| Crane Slough | Columbia, OR | 27.7 miles | NW |
| Cunningham Slough | Columbia, OR | 29.9 miles | NW |
| Wallace Slough | Cowlitz, WA | 31.1 miles | NW |
| Goerig Slough | Cowlitz, WA | 32.4 miles | NW |
| Benham Slough | Columbia, OR | 36.5 miles | NW |
| Deer Island Slough | Columbia, OR | 37.1 miles | NW |
| Daves Slough | Columbia, OR | 38.4 miles | NW |
| Eldriedge Slough | Marion, OR | 42.4 miles | SW |
| Marys Slough | Cowlitz, WA | 47.5 miles | NW |
| Ditch Number Three | Cowlitz, WA | 49.4 miles | NW |
| Ditch Number Five | Cowlitz, WA | 52.2 miles | NW |
| Cut-Off Slough | Cowlitz, WA | 54.4 miles | NW |
| Solo Slough | Cowlitz, WA | 55.1 miles | NW |
| Michigan Slough | Columbia, OR | 57.7 miles | NW |
| Dobbins Slough | Columbia, OR | 58 miles | NW |
| John Slough | Columbia, OR | 58.1 miles | NW |
| Bradbury Slough | Columbia, OR | 58.7 miles | NW |
| Kinnunen Cut | Columbia, OR | 58.8 miles | NW |
| Poysky Slough | Columbia, OR | 59.9 miles | NW |
| Kelli Slough | Columbia, OR | 62.2 miles | NW |
| Randa Slough | Columbia, OR | 62.7 miles | NW |
| Kerry Slough | Columbia, OR | 63.3 miles | NW |
| Ludviksen Slough | Columbia, OR | 63.5 miles | NW |
| Whiskey Joe Slough | Columbia, OR | 64 miles | NW |
| Cut-Off Slough | Wahkiakum, WA | 64.1 miles | NW |
| Net Rack Slough | Wahkiakum, WA | 64.2 miles | NW |
| Jackson Inlet | Wahkiakum, WA | 65 miles | NW |
| Cole Slough | Linn, OR | 65.6 miles | SW |
| Red Slough | Clatsop, OR | 72.4 miles | NW |
| Marks Slough | Linn, OR | 72.5 miles | SW |
| Squeedunk Slough | Tillamook, OR | 73 miles | SW |
| Purcell Slough | Lewis, WA | 73.3 miles | NE |
| Gallagher Slough | Tillamook, OR | 74.1 miles | NW |
| Marsh Island Creek | Clatsop, OR | 75.6 miles | NW |
| Stewart Slough | Benton, OR | 77.2 miles | SW |
| Cooperage Slough | Clatsop, OR | 79.1 miles | NW |
| Cook Slough | Clatsop, OR | 83.1 miles | NW |
| Wright Slough | Linn, OR | 84.2 miles | SW |
| Clark Slough | Benton, OR | 84.4 miles | SW |
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