| Purcell Slough | Lewis, WA | 15.8 miles | SE |
| Big Slough | Thurston, WA | 46 miles | NW |
| Reid Slough | King, WA | 54.2 miles | NE |
| Meadowbrook Slough | King, WA | 54.5 miles | NE |
| The Narrows | Mason, WA | 57.9 miles | NW |
| Rutherford Slough | King, WA | 58 miles | NE |
| Mercer Slough | King, WA | 58.8 miles | NW |
| Stickney Slough | King, WA | 59.6 miles | NE |
| Green Slough | King, WA | 61 miles | NE |
| Horseshoe Slough | King, WA | 61 miles | NE |
| Marys Slough | Cowlitz, WA | 61.5 miles | SW |
| Cut-Off Slough | Cowlitz, WA | 63 miles | SW |
| Ditch Number Three | Cowlitz, WA | 63.1 miles | SW |
| Ditch Number Five | Cowlitz, WA | 63.6 miles | SW |
| Solo Slough | Cowlitz, WA | 63.8 miles | SW |
| The Narrows | Mason, WA | 65.4 miles | NW |
| Daves Slough | Columbia, OR | 67.9 miles | SW |
| Bradbury Slough | Columbia, OR | 68.5 miles | SW |
| John Slough | Columbia, OR | 68.6 miles | SW |
| Deer Island Slough | Columbia, OR | 69.1 miles | SW |
| Benham Slough | Columbia, OR | 69.5 miles | SW |
| Dobbins Slough | Columbia, OR | 69.9 miles | SW |
| Goerig Slough | Cowlitz, WA | 69.9 miles | SW |
| Wallace Slough | Cowlitz, WA | 70.7 miles | SW |
| Poysky Slough | Columbia, OR | 70.8 miles | SW |
| Michigan Slough | Columbia, OR | 71.9 miles | SW |
| Kinnunen Cut | Columbia, OR | 73.2 miles | SW |
| Bachelor Island Slough | Clark, WA | 74.7 miles | SW |
| Cunningham Slough | Columbia, OR | 74.9 miles | SW |
| Bower Slough | Clark, WA | 75.2 miles | SW |
| Greenleaf Slough | Skamania, WA | 75.6 miles | SE |
| Jackson Inlet | Wahkiakum, WA | 76.7 miles | SW |
| Cut-Off Slough | Wahkiakum, WA | 76.8 miles | SW |
| Kelli Slough | Columbia, OR | 77.1 miles | SW |
| Net Rack Slough | Wahkiakum, WA | 77.2 miles | SW |
| Randa Slough | Columbia, OR | 77.3 miles | SW |
| Crane Slough | Columbia, OR | 77.3 miles | SW |
| Ludviksen Slough | Columbia, OR | 77.8 miles | SW |
| Whiskey Joe Slough | Columbia, OR | 78.1 miles | SW |
| Kerry Slough | Columbia, OR | 78.3 miles | SW |
| Petes Slough | Columbia, OR | 78.7 miles | SW |
| Red Slough | Clatsop, OR | 79 miles | SW |
| Batt Slough | Snohomish, WA | 79.8 miles | NW |
| Hanson Slough | Snohomish, WA | 80.2 miles | NW |
| Buckmire Slough | Clark, WA | 81.5 miles | SW |
| Broad Slough | Multnomah, OR | 82.4 miles | SW |
| Ellis Slough | Pacific, WA | 82.8 miles | SW |
| Jack Slough | Multnomah, OR | 83.2 miles | SW |
| Mud Slough | Multnomah, OR | 83.7 miles | SW |
| Marsh Island Creek | Clatsop, OR | 83.9 miles | SW |
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