| Wallace Slough | Cowlitz, WA | 12.6 miles | NW |
| Bachelor Island Slough | Clark, WA | 13 miles | SW |
| Bower Slough | Clark, WA | 13 miles | SW |
| Goerig Slough | Cowlitz, WA | 13.3 miles | NW |
| Cunningham Slough | Columbia, OR | 14.8 miles | SW |
| Crane Slough | Columbia, OR | 15.4 miles | SW |
| Petes Slough | Columbia, OR | 16 miles | SW |
| Buckmire Slough | Clark, WA | 16.5 miles | SW |
| Benham Slough | Columbia, OR | 16.9 miles | NW |
| Deer Island Slough | Columbia, OR | 17.3 miles | NW |
| Daves Slough | Columbia, OR | 17.9 miles | NW |
| Broad Slough | Multnomah, OR | 18.3 miles | SW |
| Mud Slough | Multnomah, OR | 19.7 miles | SW |
| Jack Slough | Multnomah, OR | 20.1 miles | SW |
| Mud Slough | Multnomah, OR | 20.3 miles | SW |
| Ash Slough | Multnomah, OR | 20.5 miles | SW |
| Columbia Slough | Multnomah, OR | 21.2 miles | SE |
| Marys Slough | Cowlitz, WA | 24.9 miles | NW |
| Ditch Number Three | Cowlitz, WA | 27.3 miles | NW |
| Greenleaf Slough | Skamania, WA | 30.1 miles | SE |
| Ditch Number Five | Cowlitz, WA | 30.2 miles | NW |
| Cut-Off Slough | Cowlitz, WA | 32.2 miles | NW |
| Solo Slough | Cowlitz, WA | 33.1 miles | NW |
| John Slough | Columbia, OR | 37.1 miles | NW |
| Dobbins Slough | Columbia, OR | 37.4 miles | NW |
| Michigan Slough | Columbia, OR | 37.7 miles | NW |
| Bradbury Slough | Columbia, OR | 37.7 miles | NW |
| Kinnunen Cut | Columbia, OR | 39.1 miles | NW |
| Poysky Slough | Columbia, OR | 39.5 miles | NW |
| Kelli Slough | Columbia, OR | 43.3 miles | NW |
| Randa Slough | Columbia, OR | 43.8 miles | NW |
| Kerry Slough | Columbia, OR | 44.6 miles | NW |
| Ludviksen Slough | Columbia, OR | 44.7 miles | NW |
| Cut-Off Slough | Wahkiakum, WA | 44.9 miles | NW |
| Net Rack Slough | Wahkiakum, WA | 45.1 miles | NW |
| Whiskey Joe Slough | Columbia, OR | 45.2 miles | NW |
| Jackson Inlet | Wahkiakum, WA | 45.6 miles | NW |
| Red Slough | Clatsop, OR | 52.8 miles | NW |
| Purcell Slough | Lewis, WA | 55.6 miles | NE |
| Marsh Island Creek | Clatsop, OR | 56.9 miles | NW |
| Eldriedge Slough | Marion, OR | 57.2 miles | SW |
| Cooperage Slough | Clatsop, OR | 63.4 miles | NW |
| Gallagher Slough | Tillamook, OR | 66.6 miles | SW |
| Cook Slough | Clatsop, OR | 66.8 miles | NW |
| Squeedunk Slough | Tillamook, OR | 70.6 miles | SW |
| Roaring Creek Slough | Pacific, WA | 75.2 miles | NW |
| Greenhead Slough | Pacific, WA | 77.4 miles | NW |
| Parker Slough | Pacific, WA | 79.5 miles | NW |
| Parker Slough | Pacific, WA | 79.8 miles | NW |
| Ellis Slough | Pacific, WA | 80.8 miles | NW |
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