| Big Slough | Thurston, WA | 22.6 miles | NE |
| The Narrows | Mason, WA | 25.9 miles | NW |
| The Narrows | Mason, WA | 39.2 miles | NW |
| Ellis Slough | Pacific, WA | 41.1 miles | SW |
| Cut-Off Slough | Cowlitz, WA | 43.8 miles | SW |
| Solo Slough | Cowlitz, WA | 43.9 miles | SW |
| Cosmopolis Waterway | Grays Harbor, WA | 44.4 miles | NW |
| Bradbury Slough | Columbia, OR | 45.3 miles | SW |
| Ditch Number Five | Cowlitz, WA | 45.7 miles | SW |
| John Slough | Columbia, OR | 45.8 miles | SW |
| Poysky Slough | Columbia, OR | 46.6 miles | SW |
| Dobbins Slough | Columbia, OR | 47 miles | SW |
| Ditch Number Three | Cowlitz, WA | 47.3 miles | SW |
| Marys Slough | Cowlitz, WA | 47.6 miles | SW |
| Red Slough | Clatsop, OR | 48 miles | SW |
| Michigan Slough | Columbia, OR | 48.9 miles | SW |
| Jackson Inlet | Wahkiakum, WA | 49.4 miles | SW |
| Kinnunen Cut | Columbia, OR | 49.5 miles | SW |
| Cut-Off Slough | Wahkiakum, WA | 50 miles | SW |
| Net Rack Slough | Wahkiakum, WA | 50.3 miles | SW |
| Kelli Slough | Columbia, OR | 51.3 miles | SW |
| Randa Slough | Columbia, OR | 51.3 miles | SW |
| Ludviksen Slough | Columbia, OR | 51.4 miles | SW |
| Whiskey Joe Slough | Columbia, OR | 51.4 miles | SW |
| Purcell Slough | Lewis, WA | 51.6 miles | SE |
| Marsh Island Creek | Clatsop, OR | 51.8 miles | SW |
| Kerry Slough | Columbia, OR | 52 miles | SW |
| Roaring Creek Slough | Pacific, WA | 53.4 miles | SW |
| Kindred Slough | Pacific, WA | 54 miles | SW |
| Cannery Slough | Pacific, WA | 55.6 miles | SW |
| Daves Slough | Columbia, OR | 57.6 miles | SE |
| Deer Island Slough | Columbia, OR | 59.1 miles | SE |
| Benham Slough | Columbia, OR | 59.8 miles | SE |
| Greenhead Slough | Pacific, WA | 59.8 miles | SW |
| Parker Slough | Pacific, WA | 61.6 miles | SW |
| Parker Slough | Pacific, WA | 61.8 miles | SW |
| Goerig Slough | Cowlitz, WA | 62.6 miles | SE |
| Mercer Slough | King, WA | 62.7 miles | NE |
| Wallace Slough | Cowlitz, WA | 63.9 miles | SE |
| Cook Slough | Clatsop, OR | 64 miles | SW |
| Cooperage Slough | Clatsop, OR | 65 miles | SW |
| Cunningham Slough | Columbia, OR | 67.4 miles | SE |
| Bachelor Island Slough | Clark, WA | 68.7 miles | SE |
| Bower Slough | Clark, WA | 69.4 miles | SE |
| Crane Slough | Columbia, OR | 70.4 miles | SE |
| Meadowbrook Slough | King, WA | 70.8 miles | NE |
| Rutherford Slough | King, WA | 70.9 miles | NE |
| Stickney Slough | King, WA | 70.9 miles | NE |
| Reid Slough | King, WA | 71.2 miles | NE |
| Petes Slough | Columbia, OR | 72 miles | SE |
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