| Columbia Slough | Multnomah, OR | 5.5 miles | SW |
| Mud Slough | Multnomah, OR | 13.7 miles | SW |
| Buckmire Slough | Clark, WA | 16.5 miles | NW |
| Broad Slough | Multnomah, OR | 19.4 miles | NW |
| Mud Slough | Multnomah, OR | 20.3 miles | NW |
| Ash Slough | Multnomah, OR | 20.9 miles | NW |
| Bower Slough | Clark, WA | 21 miles | NW |
| Petes Slough | Columbia, OR | 21.3 miles | NW |
| Bachelor Island Slough | Clark, WA | 21.6 miles | NW |
| Greenleaf Slough | Skamania, WA | 21.8 miles | NE |
| Crane Slough | Columbia, OR | 22.1 miles | NW |
| Jack Slough | Multnomah, OR | 22.3 miles | NW |
| Cunningham Slough | Columbia, OR | 24 miles | NW |
| Wallace Slough | Cowlitz, WA | 25 miles | NW |
| Goerig Slough | Cowlitz, WA | 26.2 miles | NW |
| Benham Slough | Columbia, OR | 30.3 miles | NW |
| Deer Island Slough | Columbia, OR | 30.9 miles | NW |
| Daves Slough | Columbia, OR | 32.1 miles | NW |
| Marys Slough | Cowlitz, WA | 41.2 miles | NW |
| Ditch Number Three | Cowlitz, WA | 43.1 miles | NW |
| Eldriedge Slough | Marion, OR | 44.9 miles | SW |
| Ditch Number Five | Cowlitz, WA | 45.9 miles | NW |
| Cut-Off Slough | Cowlitz, WA | 48.1 miles | NW |
| Solo Slough | Cowlitz, WA | 48.8 miles | NW |
| Michigan Slough | Columbia, OR | 51.7 miles | NW |
| John Slough | Columbia, OR | 51.9 miles | NW |
| Dobbins Slough | Columbia, OR | 51.9 miles | NW |
| Bradbury Slough | Columbia, OR | 52.5 miles | NW |
| Kinnunen Cut | Columbia, OR | 52.9 miles | NW |
| Poysky Slough | Columbia, OR | 53.9 miles | NW |
| Kelli Slough | Columbia, OR | 56.4 miles | NW |
| Randa Slough | Columbia, OR | 56.9 miles | NW |
| Kerry Slough | Columbia, OR | 57.5 miles | NW |
| Ludviksen Slough | Columbia, OR | 57.7 miles | NW |
| Whiskey Joe Slough | Columbia, OR | 58.2 miles | NW |
| Cut-Off Slough | Wahkiakum, WA | 58.3 miles | NW |
| Net Rack Slough | Wahkiakum, WA | 58.4 miles | NW |
| Jackson Inlet | Wahkiakum, WA | 59.1 miles | NW |
| Red Slough | Clatsop, OR | 66.5 miles | NW |
| Purcell Slough | Lewis, WA | 68.7 miles | NE |
| Cole Slough | Linn, OR | 69.2 miles | SW |
| Marsh Island Creek | Clatsop, OR | 69.9 miles | NW |
| Gallagher Slough | Tillamook, OR | 70.7 miles | NW |
| Squeedunk Slough | Tillamook, OR | 70.9 miles | SW |
| Cooperage Slough | Clatsop, OR | 73.9 miles | NW |
| Marks Slough | Linn, OR | 77.2 miles | SW |
| Cook Slough | Clatsop, OR | 77.8 miles | NW |
| Stewart Slough | Benton, OR | 80.8 miles | SW |
| Clark Slough | Benton, OR | 88.3 miles | SW |
| Wright Slough | Linn, OR | 88.7 miles | SW |
|