| Gallagher Slough | Tillamook, OR | 1.9 miles | NE |
| Squeedunk Slough | Tillamook, OR | 13.5 miles | SE |
| Cooperage Slough | Clatsop, OR | 29.3 miles | NE |
| Cook Slough | Clatsop, OR | 32.7 miles | NE |
| Kerry Slough | Columbia, OR | 40 miles | NE |
| Whiskey Joe Slough | Columbia, OR | 40.5 miles | NE |
| Marsh Island Creek | Clatsop, OR | 40.5 miles | NE |
| Ludviksen Slough | Columbia, OR | 40.6 miles | NE |
| Randa Slough | Columbia, OR | 40.9 miles | NE |
| Kelli Slough | Columbia, OR | 41 miles | NE |
| Net Rack Slough | Wahkiakum, WA | 41.5 miles | NE |
| Cut-Off Slough | Wahkiakum, WA | 41.8 miles | NE |
| Jackson Inlet | Wahkiakum, WA | 42.3 miles | NE |
| Red Slough | Clatsop, OR | 43.6 miles | NE |
| Kinnunen Cut | Columbia, OR | 44.3 miles | NE |
| Michigan Slough | Columbia, OR | 45.4 miles | NE |
| Poysky Slough | Columbia, OR | 46.9 miles | NE |
| Greenhead Slough | Pacific, WA | 47 miles | NW |
| Dobbins Slough | Columbia, OR | 47.5 miles | NE |
| Parker Slough | Pacific, WA | 47.5 miles | NW |
| Parker Slough | Pacific, WA | 47.5 miles | NW |
| John Slough | Columbia, OR | 48.8 miles | NE |
| Bradbury Slough | Columbia, OR | 49.1 miles | NE |
| Jack Slough | Multnomah, OR | 49.9 miles | NE |
| Ash Slough | Multnomah, OR | 50.8 miles | SE |
| Roaring Creek Slough | Pacific, WA | 51.3 miles | NE |
| Mud Slough | Multnomah, OR | 51.5 miles | SE |
| Broad Slough | Multnomah, OR | 52.7 miles | NE |
| Petes Slough | Columbia, OR | 52.7 miles | NE |
| Crane Slough | Columbia, OR | 52.8 miles | NE |
| Cunningham Slough | Columbia, OR | 53 miles | NE |
| Benham Slough | Columbia, OR | 53.3 miles | NE |
| Deer Island Slough | Columbia, OR | 53.4 miles | NE |
| Solo Slough | Cowlitz, WA | 53.5 miles | NE |
| Ditch Number Five | Cowlitz, WA | 53.7 miles | NE |
| Daves Slough | Columbia, OR | 53.8 miles | NE |
| Cut-Off Slough | Cowlitz, WA | 54.2 miles | NE |
| Ditch Number Three | Cowlitz, WA | 54.6 miles | NE |
| Bachelor Island Slough | Clark, WA | 55 miles | NE |
| Bower Slough | Clark, WA | 55.1 miles | NE |
| Buckmire Slough | Clark, WA | 55.5 miles | NE |
| Goerig Slough | Cowlitz, WA | 55.6 miles | NE |
| Wallace Slough | Cowlitz, WA | 55.8 miles | NE |
| Marys Slough | Cowlitz, WA | 56.7 miles | NE |
| Mud Slough | Multnomah, OR | 57.9 miles | SE |
| Eldriedge Slough | Marion, OR | 58.6 miles | SE |
| Columbia Slough | Multnomah, OR | 68.2 miles | SE |
| Ellis Slough | Pacific, WA | 69.4 miles | NE |
| Kindred Slough | Pacific, WA | 72 miles | NW |
| Cannery Slough | Pacific, WA | 72.1 miles | NW |
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