| Marys Slough | Cowlitz, WA | 2.7 miles | NW |
| Ditch Number Three | Cowlitz, WA | 4.9 miles | NW |
| Daves Slough | Columbia, OR | 7.5 miles | SE |
| Ditch Number Five | Cowlitz, WA | 7.7 miles | NW |
| Deer Island Slough | Columbia, OR | 9 miles | SE |
| Benham Slough | Columbia, OR | 9.7 miles | SE |
| Cut-Off Slough | Cowlitz, WA | 9.8 miles | NW |
| Solo Slough | Cowlitz, WA | 10.7 miles | NW |
| Goerig Slough | Cowlitz, WA | 12.9 miles | SE |
| Wallace Slough | Cowlitz, WA | 14.3 miles | SE |
| John Slough | Columbia, OR | 15 miles | NW |
| Dobbins Slough | Columbia, OR | 15.5 miles | NW |
| Bradbury Slough | Columbia, OR | 15.5 miles | NW |
| Michigan Slough | Columbia, OR | 16.3 miles | NW |
| Cunningham Slough | Columbia, OR | 17.4 miles | SE |
| Poysky Slough | Columbia, OR | 17.5 miles | NW |
| Kinnunen Cut | Columbia, OR | 17.9 miles | NW |
| Bachelor Island Slough | Clark, WA | 18.9 miles | SE |
| Bower Slough | Clark, WA | 19.6 miles | SE |
| Crane Slough | Columbia, OR | 20.3 miles | SE |
| Petes Slough | Columbia, OR | 22 miles | SE |
| Kelli Slough | Columbia, OR | 22.4 miles | NW |
| Randa Slough | Columbia, OR | 22.9 miles | NW |
| Cut-Off Slough | Wahkiakum, WA | 23.7 miles | NW |
| Ludviksen Slough | Columbia, OR | 23.8 miles | NW |
| Kerry Slough | Columbia, OR | 23.9 miles | NW |
| Net Rack Slough | Wahkiakum, WA | 23.9 miles | NW |
| Whiskey Joe Slough | Columbia, OR | 24.2 miles | NW |
| Jackson Inlet | Wahkiakum, WA | 24.3 miles | NW |
| Jack Slough | Multnomah, OR | 25.5 miles | SE |
| Broad Slough | Multnomah, OR | 26.4 miles | SE |
| Mud Slough | Multnomah, OR | 27.1 miles | SE |
| Buckmire Slough | Clark, WA | 27.3 miles | SE |
| Ash Slough | Multnomah, OR | 27.4 miles | SE |
| Red Slough | Clatsop, OR | 31.1 miles | NW |
| Mud Slough | Multnomah, OR | 33.6 miles | SE |
| Marsh Island Creek | Clatsop, OR | 35.5 miles | NW |
| Columbia Slough | Multnomah, OR | 39.9 miles | SE |
| Cooperage Slough | Clatsop, OR | 44.1 miles | NW |
| Cook Slough | Clatsop, OR | 46.8 miles | NW |
| Greenleaf Slough | Skamania, WA | 52.3 miles | SE |
| Roaring Creek Slough | Pacific, WA | 53.2 miles | NW |
| Gallagher Slough | Tillamook, OR | 54.6 miles | SW |
| Greenhead Slough | Pacific, WA | 55.8 miles | NW |
| Purcell Slough | Lewis, WA | 57.6 miles | NE |
| Parker Slough | Pacific, WA | 58.1 miles | NW |
| Parker Slough | Pacific, WA | 58.3 miles | NW |
| Ellis Slough | Pacific, WA | 58.5 miles | NW |
| Squeedunk Slough | Tillamook, OR | 63.1 miles | SW |
| Eldriedge Slough | Marion, OR | 66.8 miles | SW |
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