| Wallace Slough | Cowlitz, WA | 17.3 miles | SW |
| Goerig Slough | Cowlitz, WA | 17.3 miles | SW |
| Daves Slough | Columbia, OR | 19.3 miles | SW |
| Deer Island Slough | Columbia, OR | 19.4 miles | SW |
| Benham Slough | Columbia, OR | 19.4 miles | SW |
| Bachelor Island Slough | Clark, WA | 19.9 miles | SW |
| Bower Slough | Clark, WA | 20.2 miles | SW |
| Cunningham Slough | Columbia, OR | 21 miles | SW |
| Marys Slough | Cowlitz, WA | 22.3 miles | NW |
| Crane Slough | Columbia, OR | 22.6 miles | SW |
| Petes Slough | Columbia, OR | 23.7 miles | SW |
| Ditch Number Three | Cowlitz, WA | 25 miles | NW |
| Buckmire Slough | Clark, WA | 25.5 miles | SW |
| Broad Slough | Multnomah, OR | 26.8 miles | SW |
| Ditch Number Five | Cowlitz, WA | 27.8 miles | NW |
| Jack Slough | Multnomah, OR | 28.1 miles | SW |
| Mud Slough | Multnomah, OR | 28.1 miles | SW |
| Ash Slough | Multnomah, OR | 28.9 miles | SW |
| Cut-Off Slough | Cowlitz, WA | 29.4 miles | NW |
| Mud Slough | Multnomah, OR | 29.8 miles | SW |
| Columbia Slough | Multnomah, OR | 30.4 miles | SW |
| Solo Slough | Cowlitz, WA | 30.5 miles | NW |
| Greenleaf Slough | Skamania, WA | 33.5 miles | SE |
| John Slough | Columbia, OR | 35.4 miles | NW |
| Bradbury Slough | Columbia, OR | 35.8 miles | NW |
| Dobbins Slough | Columbia, OR | 36 miles | NW |
| Michigan Slough | Columbia, OR | 36.8 miles | NW |
| Poysky Slough | Columbia, OR | 38 miles | NW |
| Kinnunen Cut | Columbia, OR | 38.4 miles | NW |
| Kelli Slough | Columbia, OR | 42.9 miles | NW |
| Randa Slough | Columbia, OR | 43.4 miles | NW |
| Cut-Off Slough | Wahkiakum, WA | 44.2 miles | NW |
| Kerry Slough | Columbia, OR | 44.3 miles | NW |
| Ludviksen Slough | Columbia, OR | 44.3 miles | NW |
| Net Rack Slough | Wahkiakum, WA | 44.4 miles | NW |
| Whiskey Joe Slough | Columbia, OR | 44.7 miles | NW |
| Jackson Inlet | Wahkiakum, WA | 44.8 miles | NW |
| Purcell Slough | Lewis, WA | 46.5 miles | NE |
| Red Slough | Clatsop, OR | 51.5 miles | NW |
| Marsh Island Creek | Clatsop, OR | 56 miles | NW |
| Cooperage Slough | Clatsop, OR | 64.3 miles | NW |
| Eldriedge Slough | Marion, OR | 66.7 miles | SW |
| Cook Slough | Clatsop, OR | 67.2 miles | NW |
| Gallagher Slough | Tillamook, OR | 71.2 miles | SW |
| Roaring Creek Slough | Pacific, WA | 73.3 miles | NW |
| Greenhead Slough | Pacific, WA | 76.3 miles | NW |
| Ellis Slough | Pacific, WA | 76.8 miles | NW |
| Squeedunk Slough | Tillamook, OR | 76.9 miles | SW |
| Parker Slough | Pacific, WA | 78.5 miles | NW |
| Parker Slough | Pacific, WA | 78.8 miles | NW |
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