| Webb Creek Canal | Nez Perce, ID | 16.8 miles | NE |
| Sweetwater Canal | Nez Perce, ID | 17.1 miles | NE |
| Weatherspoon Ditch | Baker, OR | 34.3 miles | SW |
| Lower Valley Ditch | Wallowa, OR | 43.5 miles | SW |
| Chamberlin Ditch | Wallowa, OR | 46.2 miles | SW |
| Clear Water Ditch | Wallowa, OR | 46.6 miles | SW |
| Cross Country Ditch | Wallowa, OR | 47.8 miles | SW |
| Wade Ditch | Wallowa, OR | 48.5 miles | SW |
| Poley-Allen Ditch | Wallowa, OR | 48.8 miles | SW |
| Sheep Ridge Ditch | Wallowa, OR | 49.2 miles | SW |
| Westside Ditch | Wallowa, OR | 49.2 miles | SW |
| Allen Canyon Ditch | Wallowa, OR | 52 miles | SW |
| Island Ditch | Wallowa, OR | 52.2 miles | SW |
| Lower Alder Slope Ditch | Wallowa, OR | 52.3 miles | SW |
| Granger Ditch | Wallowa, OR | 52.8 miles | SW |
| Alder Slope Ditch | Wallowa, OR | 53.3 miles | SW |
| Wrenn Dobbin Ditch | Wallowa, OR | 53.9 miles | SW |
| Big Bend Ditch | Wallowa, OR | 54 miles | SW |
| Farmers Ditch | Wallowa, OR | 54.3 miles | SW |
| Silver Lake Ditch | Wallowa, OR | 54.5 miles | SW |
| Hurricane Ditch | Wallowa, OR | 54.7 miles | SW |
| Silver Grange Ditch | Wallowa, OR | 55.4 miles | SW |
| Coye Ditch | Wallowa, OR | 55.8 miles | SW |
| Consolidated Ditch | Wallowa, OR | 56.2 miles | SW |
| Moonshine Ditch | Wallowa, OR | 56.8 miles | SW |
| Wallowa Valley Improvement Canal | Wallowa, OR | 58 miles | SW |
| Mill Creek Channel | Walla Walla, WA | 59.9 miles | SW |
| Bowlus Ditch | Umatilla, OR | 61.4 miles | SW |
| Dorothy Ditch | Umatilla, OR | 61.8 miles | SW |
| Spence Ditch | Umatilla, OR | 63.3 miles | SW |
| Zell Ditch | Umatilla, OR | 64.3 miles | SW |
| Milton Ditch | Umatilla, OR | 64.9 miles | SW |
| Pleasant View Canal | Umatilla, OR | 65.7 miles | SW |
| State Ditch | Union, OR | 66.5 miles | SW |
| Hudson Bay Canal | Umatilla, OR | 67 miles | SW |
| Whitman Ditch | Walla Walla, WA | 69.1 miles | SW |
| Burlingame Ditch | Walla Walla, WA | 69.8 miles | SW |
| Ordell Ditch | Union, OR | 70 miles | SW |
| Williams Ditch | Walla Walla, WA | 70.3 miles | SW |
| Garden City Ditch | Walla Walla, WA | 71 miles | SW |
| Mud District Number 2 Canal | Walla Walla, WA | 71 miles | SW |
| Elmer Ditch | Union, OR | 71.9 miles | SW |
| McAlister Ditch | Union, OR | 72 miles | SW |
| Catherine Creek Highline Canal | Union, OR | 72.3 miles | SW |
| Short Low Ditch (historical) | Walla Walla, WA | 72.3 miles | SW |
| Dobbin Ditch | Union, OR | 72.5 miles | SW |
| Mud District Number 7 Canal | Walla Walla, WA | 72.7 miles | SW |
| Short Low Ditch | Umatilla, OR | 72.8 miles | SW |
| White Ditch | Umatilla, OR | 72.8 miles | SW |
| Mud Creek Canal | Walla Walla, WA | 72.9 miles | SW |
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