| The Narrows | Mason, WA | 9.8 miles | SW |
| The Narrows | Mason, WA | 21.6 miles | SW |
| Big Slough | Thurston, WA | 22.8 miles | SE |
| Mercer Slough | King, WA | 33.1 miles | NE |
| Stickney Slough | King, WA | 45 miles | NE |
| Green Slough | King, WA | 45.6 miles | NE |
| Horseshoe Slough | King, WA | 45.9 miles | NE |
| Rutherford Slough | King, WA | 46.7 miles | NE |
| Hanson Slough | Snohomish, WA | 47.3 miles | NE |
| Batt Slough | Snohomish, WA | 47.3 miles | NE |
| Deadwater Slough | Snohomish, WA | 49.3 miles | NE |
| Meadowbrook Slough | King, WA | 50.1 miles | NE |
| Deadman Slough | Snohomish, WA | 50.7 miles | NE |
| Reid Slough | King, WA | 51.1 miles | NE |
| Cosmopolis Waterway | Grays Harbor, WA | 54.3 miles | SW |
| Davis Slough | Island, WA | 59.4 miles | NE |
| Irvine Slough | Snohomish, WA | 59.8 miles | NE |
| Douglas Slough | Snohomish, WA | 61.1 miles | NE |
| Ellis Slough | Pacific, WA | 66.3 miles | SW |
| Sullivan Slough | Skagit, WA | 67.3 miles | NE |
| Higgins Slough | Skagit, WA | 71 miles | NE |
| Blind Slough | Skagit, WA | 71.3 miles | NE |
| Telegraph Slough | Skagit, WA | 71.6 miles | NE |
| Kindred Slough | Pacific, WA | 73.2 miles | SW |
| Cannery Slough | Pacific, WA | 74.4 miles | SW |
| Cap Sante Waterway | Skagit, WA | 75 miles | NE |
| Siwash Slough | Skagit, WA | 79.3 miles | NE |
| Purcell Slough | Lewis, WA | 79.3 miles | SE |
| Roaring Creek Slough | Pacific, WA | 84.4 miles | SW |
| Red Slough | Clatsop, OR | 88 miles | SW |
| Cut-Off Slough | Cowlitz, WA | 88.2 miles | SW |
| Solo Slough | Cowlitz, WA | 88.2 miles | SW |
| Bradbury Slough | Columbia, OR | 88.9 miles | SW |
| John Slough | Columbia, OR | 89.4 miles | SW |
| Poysky Slough | Columbia, OR | 89.8 miles | SW |
| Ditch Number Five | Cowlitz, WA | 90.1 miles | SW |
| Dobbins Slough | Columbia, OR | 90.5 miles | SW |
| Marsh Island Creek | Clatsop, OR | 90.6 miles | SW |
| Greenhead Slough | Pacific, WA | 90.8 miles | SW |
| Jackson Inlet | Wahkiakum, WA | 91.3 miles | SW |
| Ditch Number Three | Cowlitz, WA | 91.8 miles | SW |
| Parker Slough | Pacific, WA | 91.8 miles | SW |
| Cut-Off Slough | Wahkiakum, WA | 92 miles | SW |
| Parker Slough | Pacific, WA | 92 miles | SW |
| Marys Slough | Cowlitz, WA | 92.2 miles | SW |
| Net Rack Slough | Wahkiakum, WA | 92.3 miles | SW |
| Michigan Slough | Columbia, OR | 92.3 miles | SW |
| Kinnunen Cut | Columbia, OR | 92.6 miles | SW |
| Whiskey Joe Slough | Columbia, OR | 93.3 miles | SW |
| Ludviksen Slough | Columbia, OR | 93.4 miles | SW |
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