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Kaskaskia River
| States | Illinois |
| Length | 304.6 miles |
| Watershed Length* | 1,679 miles |
| Mouth | Mississippi River ⤏ Gulf of Mexico |
| GNIS | 426395 |
Tributaries
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| Name | Distance from Mouth (miles) | Length (miles) | Watershed Length (miles) |
|---|---|---|---|
| Becks Creek | 177 | 28 | 50 |
| Big Creek | 171 | 11 | 36 |
| Crooked Creek | 77 | 75 | 160 |
| Doza Creek | 21 | 20 | 20 |
| Elkhorn Creek | 49 | 31 | 31 |
| Flat Creek | 133 | 18 | 18 |
| Hickory Creek | 144 | 24 | 24 |
| Horse Creek | 12 | 29 | 29 |
| Hurricane Creek | 123 | 48 | 48 |
| Jonathan Creek | 251 | 19 | 19 |
| Kaskaskia River - East Fork | 116 | 52 | 83 |
| Lake Fork | 287 | 24 | 39 |
| Mud Creek | 34 | 39 | 54 |
| Ninemile Creek | 5 | 18 | 18 |
| Plum Creek | 13 | 33 | 33 |
| Ramsey Creek | 159 | 31 | 31 |
| Richland Creek | 191 | 28 | 28 |
| Richland Creek | 22 | 40 | 84 |
| Robinson Creek | 208 | 31 | 31 |
| Sand Creek | 226 | 15 | 15 |
| Shoal Creek | 63 | 82 | 257 |
| Silver Creek | 30 | 87 | 163 |
| Sugar Creek | 60 | 42 | 42 |
| West Okaw River | 235 | 32 | 48 |
| Whitley Creek | 245 | 16 | 16 |
* Note: Watershed is mostly rivers/streams 15+ miles in length.
Data from United States Geological Survey