| Greenleaf Slough | Skamania, WA | 19.8 miles | NE |
| Columbia Slough | Multnomah, OR | 27.3 miles | NW |
| Mud Slough | Multnomah, OR | 37.5 miles | NW |
| Buckmire Slough | Clark, WA | 42.3 miles | NW |
| Broad Slough | Multnomah, OR | 44.9 miles | NW |
| Mud Slough | Multnomah, OR | 45.6 miles | NW |
| Ash Slough | Multnomah, OR | 46 miles | NW |
| Petes Slough | Columbia, OR | 47.5 miles | NW |
| Bower Slough | Clark, WA | 47.5 miles | NW |
| Jack Slough | Multnomah, OR | 47.7 miles | NW |
| Bachelor Island Slough | Clark, WA | 48.1 miles | NW |
| Crane Slough | Columbia, OR | 48.5 miles | NW |
| Cunningham Slough | Columbia, OR | 50.5 miles | NW |
| Wallace Slough | Cowlitz, WA | 51.4 miles | NW |
| Eldriedge Slough | Marion, OR | 51.6 miles | SW |
| Goerig Slough | Cowlitz, WA | 52.6 miles | NW |
| Benham Slough | Columbia, OR | 56.7 miles | NW |
| Deer Island Slough | Columbia, OR | 57.3 miles | NW |
| Daves Slough | Columbia, OR | 58.5 miles | NW |
| Marys Slough | Cowlitz, WA | 67 miles | NW |
| Cole Slough | Linn, OR | 69.2 miles | SW |
| Ditch Number Three | Cowlitz, WA | 69.2 miles | NW |
| Marks Slough | Linn, OR | 71.3 miles | SW |
| Ditch Number Five | Cowlitz, WA | 72 miles | NW |
| Cut-Off Slough | Cowlitz, WA | 74.2 miles | NW |
| Solo Slough | Cowlitz, WA | 75 miles | NW |
| Michigan Slough | Columbia, OR | 78.2 miles | NW |
| John Slough | Columbia, OR | 78.3 miles | NW |
| Dobbins Slough | Columbia, OR | 78.4 miles | NW |
| Bradbury Slough | Columbia, OR | 78.9 miles | NW |
| Kinnunen Cut | Columbia, OR | 79.4 miles | NW |
| Stewart Slough | Benton, OR | 80.1 miles | SW |
| Poysky Slough | Columbia, OR | 80.3 miles | NW |
| Purcell Slough | Lewis, WA | 80.9 miles | NE |
| Kelli Slough | Columbia, OR | 82.9 miles | NW |
| Randa Slough | Columbia, OR | 83.4 miles | NW |
| Wright Slough | Linn, OR | 83.7 miles | SW |
| Kerry Slough | Columbia, OR | 84 miles | NW |
| Ludviksen Slough | Columbia, OR | 84.2 miles | NW |
| Whiskey Joe Slough | Columbia, OR | 84.7 miles | NW |
| Cut-Off Slough | Wahkiakum, WA | 84.8 miles | NW |
| Net Rack Slough | Wahkiakum, WA | 84.9 miles | NW |
| Jackson Inlet | Wahkiakum, WA | 85.6 miles | NW |
| McAllister Slough | Crook, OR | 85.9 miles | SE |
| Clark Slough | Benton, OR | 86 miles | SW |
| McBee Slough | Benton, OR | 86.5 miles | SW |
| Squeedunk Slough | Tillamook, OR | 91 miles | NW |
| Red Slough | Clatsop, OR | 93 miles | NW |
| Gallagher Slough | Tillamook, OR | 93.7 miles | NW |
| Lake Slough | Benton, OR | 96.3 miles | SW |
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