| Ellis Slough | Pacific, WA | 7.9 miles | NE |
| Roaring Creek Slough | Pacific, WA | 11 miles | SW |
| Kindred Slough | Pacific, WA | 14 miles | NW |
| Cannery Slough | Pacific, WA | 15.1 miles | NW |
| Greenhead Slough | Pacific, WA | 16.9 miles | SW |
| Parker Slough | Pacific, WA | 17.7 miles | SW |
| Parker Slough | Pacific, WA | 17.9 miles | SW |
| Cosmopolis Waterway | Grays Harbor, WA | 26.3 miles | NE |
| Marsh Island Creek | Clatsop, OR | 26.7 miles | SE |
| Red Slough | Clatsop, OR | 28.3 miles | SE |
| Cook Slough | Clatsop, OR | 29.4 miles | SW |
| Cooperage Slough | Clatsop, OR | 33.1 miles | SE |
| Jackson Inlet | Wahkiakum, WA | 35.5 miles | SE |
| Cut-Off Slough | Wahkiakum, WA | 36.5 miles | SE |
| Net Rack Slough | Wahkiakum, WA | 36.5 miles | SE |
| Whiskey Joe Slough | Columbia, OR | 36.9 miles | SE |
| Ludviksen Slough | Columbia, OR | 37.3 miles | SE |
| Kerry Slough | Columbia, OR | 37.7 miles | SE |
| Randa Slough | Columbia, OR | 38 miles | SE |
| Kelli Slough | Columbia, OR | 38.5 miles | SE |
| Poysky Slough | Columbia, OR | 40.1 miles | SE |
| Kinnunen Cut | Columbia, OR | 41.3 miles | SE |
| Bradbury Slough | Columbia, OR | 41.6 miles | SE |
| Dobbins Slough | Columbia, OR | 42.1 miles | SE |
| John Slough | Columbia, OR | 42.2 miles | SE |
| Michigan Slough | Columbia, OR | 42.4 miles | SE |
| Solo Slough | Cowlitz, WA | 45.9 miles | SE |
| Cut-Off Slough | Cowlitz, WA | 46.8 miles | SE |
| Ditch Number Five | Cowlitz, WA | 48.8 miles | SE |
| Ditch Number Three | Cowlitz, WA | 51.7 miles | SE |
| The Narrows | Mason, WA | 53.4 miles | NE |
| Marys Slough | Cowlitz, WA | 54.2 miles | SE |
| Gallagher Slough | Tillamook, OR | 60.2 miles | SW |
| Big Slough | Thurston, WA | 61 miles | NE |
| Daves Slough | Columbia, OR | 62 miles | SE |
| Deer Island Slough | Columbia, OR | 63.1 miles | SE |
| Benham Slough | Columbia, OR | 63.7 miles | SE |
| The Narrows | Mason, WA | 64.7 miles | NE |
| Goerig Slough | Cowlitz, WA | 67.8 miles | SE |
| Wallace Slough | Cowlitz, WA | 69 miles | SE |
| Cunningham Slough | Columbia, OR | 70.3 miles | SE |
| Bachelor Island Slough | Clark, WA | 72.6 miles | SE |
| Crane Slough | Columbia, OR | 72.7 miles | SE |
| Bower Slough | Clark, WA | 73.3 miles | SE |
| Petes Slough | Columbia, OR | 74 miles | SE |
| Jack Slough | Multnomah, OR | 75.4 miles | SE |
| Squeedunk Slough | Tillamook, OR | 75.5 miles | SW |
| Ash Slough | Multnomah, OR | 77.4 miles | SE |
| Mud Slough | Multnomah, OR | 77.5 miles | SE |
| Broad Slough | Multnomah, OR | 77.6 miles | SE |
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