| Jackson Inlet | Wahkiakum, WA | 3.1 miles | SE |
| Cut-Off Slough | Wahkiakum, WA | 4.1 miles | SE |
| Net Rack Slough | Wahkiakum, WA | 4.1 miles | SE |
| Red Slough | Clatsop, OR | 5.1 miles | NW |
| Whiskey Joe Slough | Columbia, OR | 5.1 miles | SE |
| Ludviksen Slough | Columbia, OR | 5.3 miles | SE |
| Randa Slough | Columbia, OR | 5.8 miles | SE |
| Kerry Slough | Columbia, OR | 5.8 miles | SE |
| Kelli Slough | Columbia, OR | 6.1 miles | SE |
| Poysky Slough | Columbia, OR | 8.4 miles | SE |
| Kinnunen Cut | Columbia, OR | 8.8 miles | SE |
| Marsh Island Creek | Clatsop, OR | 9.8 miles | NW |
| Michigan Slough | Columbia, OR | 10.1 miles | SE |
| Dobbins Slough | Columbia, OR | 10.4 miles | SE |
| Bradbury Slough | Columbia, OR | 10.6 miles | SE |
| John Slough | Columbia, OR | 11 miles | SE |
| Solo Slough | Cowlitz, WA | 16.2 miles | SE |
| Cut-Off Slough | Cowlitz, WA | 17.3 miles | SE |
| Ditch Number Five | Cowlitz, WA | 18.7 miles | SE |
| Ditch Number Three | Cowlitz, WA | 21.3 miles | SE |
| Cooperage Slough | Clatsop, OR | 21.3 miles | SW |
| Cook Slough | Clatsop, OR | 22.6 miles | SW |
| Marys Slough | Cowlitz, WA | 24.1 miles | SE |
| Roaring Creek Slough | Pacific, WA | 27.5 miles | NW |
| Greenhead Slough | Pacific, WA | 29.9 miles | NW |
| Daves Slough | Columbia, OR | 30 miles | SE |
| Deer Island Slough | Columbia, OR | 31 miles | SE |
| Benham Slough | Columbia, OR | 31.5 miles | SE |
| Parker Slough | Pacific, WA | 32.1 miles | NW |
| Parker Slough | Pacific, WA | 32.4 miles | NW |
| Goerig Slough | Cowlitz, WA | 35.7 miles | SE |
| Ellis Slough | Pacific, WA | 36.5 miles | NW |
| Wallace Slough | Cowlitz, WA | 36.8 miles | SE |
| Cunningham Slough | Columbia, OR | 37.8 miles | SE |
| Crane Slough | Columbia, OR | 40.1 miles | SE |
| Bachelor Island Slough | Clark, WA | 40.1 miles | SE |
| Bower Slough | Clark, WA | 40.8 miles | SE |
| Petes Slough | Columbia, OR | 41.4 miles | SE |
| Gallagher Slough | Tillamook, OR | 42.2 miles | SW |
| Jack Slough | Multnomah, OR | 42.7 miles | SE |
| Ash Slough | Multnomah, OR | 44.8 miles | SE |
| Broad Slough | Multnomah, OR | 44.9 miles | SE |
| Mud Slough | Multnomah, OR | 44.9 miles | SE |
| Kindred Slough | Pacific, WA | 46.5 miles | NW |
| Buckmire Slough | Clark, WA | 47 miles | SE |
| Cannery Slough | Pacific, WA | 47.6 miles | NW |
| Mud Slough | Multnomah, OR | 53.1 miles | SE |
| Cosmopolis Waterway | Grays Harbor, WA | 55.4 miles | NW |
| Squeedunk Slough | Tillamook, OR | 55.5 miles | SW |
| Columbia Slough | Multnomah, OR | 61.8 miles | SE |
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