| Big Slough | Thurston, WA | 28.8 miles | NE |
| The Narrows | Mason, WA | 30.1 miles | NW |
| Ellis Slough | Pacific, WA | 36.1 miles | SW |
| Cut-Off Slough | Cowlitz, WA | 38.1 miles | SW |
| Solo Slough | Cowlitz, WA | 38.1 miles | SW |
| Bradbury Slough | Columbia, OR | 39.1 miles | SW |
| John Slough | Columbia, OR | 39.7 miles | SW |
| Ditch Number Five | Cowlitz, WA | 40.1 miles | SW |
| Poysky Slough | Columbia, OR | 40.2 miles | SW |
| Dobbins Slough | Columbia, OR | 40.8 miles | SW |
| Red Slough | Clatsop, OR | 41.2 miles | SW |
| Ditch Number Three | Cowlitz, WA | 41.9 miles | SE |
| Cosmopolis Waterway | Grays Harbor, WA | 42 miles | NW |
| Marys Slough | Cowlitz, WA | 42.5 miles | SE |
| Michigan Slough | Columbia, OR | 42.7 miles | SW |
| Jackson Inlet | Wahkiakum, WA | 42.8 miles | SW |
| Kinnunen Cut | Columbia, OR | 43.1 miles | SW |
| Cut-Off Slough | Wahkiakum, WA | 43.4 miles | SW |
| Net Rack Slough | Wahkiakum, WA | 43.7 miles | SW |
| The Narrows | Mason, WA | 43.8 miles | NW |
| Randa Slough | Columbia, OR | 44.7 miles | SW |
| Ludviksen Slough | Columbia, OR | 44.8 miles | SW |
| Whiskey Joe Slough | Columbia, OR | 44.8 miles | SW |
| Kelli Slough | Columbia, OR | 44.8 miles | SW |
| Marsh Island Creek | Clatsop, OR | 45.1 miles | SW |
| Kerry Slough | Columbia, OR | 45.4 miles | SW |
| Roaring Creek Slough | Pacific, WA | 47.2 miles | SW |
| Kindred Slough | Pacific, WA | 49.4 miles | SW |
| Cannery Slough | Pacific, WA | 51.1 miles | SW |
| Daves Slough | Columbia, OR | 52.6 miles | SE |
| Greenhead Slough | Pacific, WA | 53.5 miles | SW |
| Purcell Slough | Lewis, WA | 54.2 miles | SE |
| Deer Island Slough | Columbia, OR | 54.2 miles | SE |
| Benham Slough | Columbia, OR | 54.9 miles | SE |
| Parker Slough | Pacific, WA | 55.3 miles | SW |
| Parker Slough | Pacific, WA | 55.6 miles | SW |
| Cook Slough | Clatsop, OR | 57.2 miles | SW |
| Goerig Slough | Cowlitz, WA | 57.9 miles | SE |
| Cooperage Slough | Clatsop, OR | 58.2 miles | SW |
| Wallace Slough | Cowlitz, WA | 59.2 miles | SE |
| Cunningham Slough | Columbia, OR | 62.6 miles | SE |
| Bachelor Island Slough | Clark, WA | 63.9 miles | SE |
| Bower Slough | Clark, WA | 64.7 miles | SE |
| Crane Slough | Columbia, OR | 65.5 miles | SE |
| Petes Slough | Columbia, OR | 67.1 miles | SE |
| Mercer Slough | King, WA | 69.4 miles | NE |
| Jack Slough | Multnomah, OR | 70.6 miles | SE |
| Broad Slough | Multnomah, OR | 71.6 miles | SE |
| Mud Slough | Multnomah, OR | 72.2 miles | SE |
| Buckmire Slough | Clark, WA | 72.3 miles | SE |
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