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Moreau River
| States | South Dakota |
| Length | 290.0 miles |
| Watershed Length* | 2,262 miles |
| Mouth | Missouri River ⤏ Gulf of Mexico |
| GNIS | 1265832 |
Tributaries
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| Name | Distance from Mouth (miles) | Length (miles) | Watershed Length (miles) |
|---|---|---|---|
| Bear Creek | 112 | 25 | 100 |
| Beaver Creek | 9 | 11 | 25 |
| Cabin Creek | 253 | 19 | 19 |
| Cottonwood Creek | 57 | 30 | 30 |
| Deep Creek | 220 | 61 | 101 |
| Flint Rock Creek | 188 | 58 | 75 |
| Goose Creek | 65 | 20 | 20 |
| Green Grass Creek | 92 | 38 | 38 |
| Handboy Creek | 18 | 22 | 22 |
| Irish Creek | 137 | 34 | 49 |
| Knife Creek | 181 | 15 | 15 |
| Little Moreau River | 48 | 48 | 48 |
| Meadow Creek | 89 | 35 | 35 |
| Moreau River - North Fork | 290 | 87 | 160 |
| Moreau River - South Fork | 290 | 136 | 472 |
| Pretty Creek | 126 | 15 | 15 |
| Rabbit Creek | 214 | 130 | 275 |
| Red Earth Creek | 100 | 51 | 51 |
| Redwater Creek | 75 | 32 | 32 |
| Swan Creek | 31 | 22 | 22 |
| Thunder Butte Creek | 152 | 146 | 253 |
| Veo Creek | 24 | 16 | 16 |
| Virgin Creek | 15 | 58 | 58 |
| Whitehorse Creek | 46 | 22 | 42 |
* Note: Watershed is mostly rivers/streams 15+ miles in length.
Data from United States Geological Survey