| Mercer Slough | King, WA | 19.1 miles | NE |
| Stickney Slough | King, WA | 25.6 miles | NE |
| Rutherford Slough | King, WA | 25.7 miles | NE |
| Meadowbrook Slough | King, WA | 26.1 miles | NE |
| Reid Slough | King, WA | 26.7 miles | NE |
| Green Slough | King, WA | 26.8 miles | NE |
| Horseshoe Slough | King, WA | 27 miles | NE |
| Big Slough | Thurston, WA | 27.4 miles | SW |
| The Narrows | Mason, WA | 36.2 miles | NW |
| The Narrows | Mason, WA | 38.1 miles | SW |
| Batt Slough | Snohomish, WA | 41.2 miles | NE |
| Hanson Slough | Snohomish, WA | 41.5 miles | NE |
| Deadwater Slough | Snohomish, WA | 46.6 miles | NE |
| Deadman Slough | Snohomish, WA | 47.8 miles | NE |
| Purcell Slough | Lewis, WA | 57.1 miles | SE |
| Irvine Slough | Snohomish, WA | 64.7 miles | NW |
| Davis Slough | Island, WA | 65 miles | NW |
| Douglas Slough | Snohomish, WA | 66.6 miles | NW |
| Sullivan Slough | Skagit, WA | 75.2 miles | NW |
| Cosmopolis Waterway | Grays Harbor, WA | 75.2 miles | SW |
| Higgins Slough | Skagit, WA | 78.9 miles | NW |
| Blind Slough | Skagit, WA | 79.5 miles | NW |
| Telegraph Slough | Skagit, WA | 79.6 miles | NW |
| Ellis Slough | Pacific, WA | 81.3 miles | SW |
| Cap Sante Waterway | Skagit, WA | 84.8 miles | NW |
| Cut-Off Slough | Cowlitz, WA | 86 miles | SW |
| Solo Slough | Cowlitz, WA | 86.4 miles | SW |
| Ditch Number Five | Cowlitz, WA | 87.5 miles | SW |
| Barnaby Slough | Skagit, WA | 87.6 miles | NE |
| Siwash Slough | Skagit, WA | 87.6 miles | NW |
| Marys Slough | Cowlitz, WA | 87.8 miles | SW |
| Ditch Number Three | Cowlitz, WA | 88.3 miles | SW |
| Bradbury Slough | Columbia, OR | 89 miles | SW |
| John Slough | Columbia, OR | 89.4 miles | SW |
| Poysky Slough | Columbia, OR | 90.6 miles | SW |
| Dobbins Slough | Columbia, OR | 90.7 miles | SW |
| Kindred Slough | Pacific, WA | 91.5 miles | SW |
| Michigan Slough | Columbia, OR | 92.7 miles | SW |
| Cannery Slough | Pacific, WA | 93 miles | SW |
| Red Slough | Clatsop, OR | 93.2 miles | SW |
| Kinnunen Cut | Columbia, OR | 93.5 miles | SW |
| Jackson Inlet | Wahkiakum, WA | 94.3 miles | SW |
| Cut-Off Slough | Wahkiakum, WA | 94.8 miles | SW |
| Net Rack Slough | Wahkiakum, WA | 95.1 miles | SW |
| Kelli Slough | Columbia, OR | 95.9 miles | SW |
| Randa Slough | Columbia, OR | 95.9 miles | SW |
| Ludviksen Slough | Columbia, OR | 96.1 miles | SW |
| Whiskey Joe Slough | Columbia, OR | 96.2 miles | SW |
| Kerry Slough | Columbia, OR | 96.7 miles | SW |
| Daves Slough | Columbia, OR | 96.8 miles | SW |
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