| The Narrows | Mason, WA | 19.1 miles | SW |
| Big Slough | Thurston, WA | 21.3 miles | SW |
| Mercer Slough | King, WA | 23.7 miles | NE |
| The Narrows | Mason, WA | 26.2 miles | SW |
| Stickney Slough | King, WA | 35.2 miles | NE |
| Green Slough | King, WA | 35.9 miles | NE |
| Horseshoe Slough | King, WA | 36.2 miles | NE |
| Rutherford Slough | King, WA | 36.6 miles | NE |
| Meadowbrook Slough | King, WA | 39.5 miles | NE |
| Reid Slough | King, WA | 40.4 miles | NE |
| Batt Slough | Snohomish, WA | 41.3 miles | NE |
| Hanson Slough | Snohomish, WA | 41.5 miles | NE |
| Deadwater Slough | Snohomish, WA | 44.7 miles | NE |
| Deadman Slough | Snohomish, WA | 46.1 miles | NE |
| Davis Slough | Island, WA | 58.5 miles | NE |
| Irvine Slough | Snohomish, WA | 58.6 miles | NE |
| Douglas Slough | Snohomish, WA | 60.1 miles | NE |
| Cosmopolis Waterway | Grays Harbor, WA | 62.3 miles | SW |
| Sullivan Slough | Skagit, WA | 67.5 miles | NE |
| Purcell Slough | Lewis, WA | 71.3 miles | SE |
| Higgins Slough | Skagit, WA | 71.3 miles | NE |
| Blind Slough | Skagit, WA | 71.7 miles | NE |
| Telegraph Slough | Skagit, WA | 71.9 miles | NE |
| Ellis Slough | Pacific, WA | 72.1 miles | SW |
| Cap Sante Waterway | Skagit, WA | 76.1 miles | NE |
| Siwash Slough | Skagit, WA | 79.9 miles | NE |
| Kindred Slough | Pacific, WA | 80.3 miles | SW |
| Cannery Slough | Pacific, WA | 81.7 miles | SW |
| Cut-Off Slough | Cowlitz, WA | 87.6 miles | SW |
| Solo Slough | Cowlitz, WA | 87.7 miles | SW |
| Bradbury Slough | Columbia, OR | 89.2 miles | SW |
| Barnaby Slough | Skagit, WA | 89.3 miles | NE |
| Ditch Number Five | Cowlitz, WA | 89.4 miles | SW |
| Roaring Creek Slough | Pacific, WA | 89.4 miles | SW |
| John Slough | Columbia, OR | 89.7 miles | SW |
| Red Slough | Clatsop, OR | 90.2 miles | SW |
| Poysky Slough | Columbia, OR | 90.3 miles | SW |
| Ditch Number Three | Cowlitz, WA | 90.7 miles | SW |
| Marys Slough | Cowlitz, WA | 90.8 miles | SW |
| Dobbins Slough | Columbia, OR | 90.8 miles | SW |
| Michigan Slough | Columbia, OR | 92.7 miles | SW |
| Jackson Inlet | Wahkiakum, WA | 92.7 miles | SW |
| Kinnunen Cut | Columbia, OR | 93.2 miles | SW |
| Marsh Island Creek | Clatsop, OR | 93.3 miles | SW |
| Cut-Off Slough | Wahkiakum, WA | 93.3 miles | SW |
| Net Rack Slough | Wahkiakum, WA | 93.6 miles | SW |
| Ludviksen Slough | Columbia, OR | 94.7 miles | SW |
| Whiskey Joe Slough | Columbia, OR | 94.7 miles | SW |
| Randa Slough | Columbia, OR | 94.7 miles | SW |
| Kelli Slough | Columbia, OR | 94.8 miles | SW |
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