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John Day River
| States | Oregon |
| Length | 284.8 miles |
| Watershed Length* | 1,243 miles |
| Mouth | Columbia River ⤏ Eastern Pacific Ocean |
| GNIS | 1144304 |
Tributaries
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| Name | Distance from Mouth (miles) | Length (miles) | Watershed Length (miles) |
|---|---|---|---|
| Beach Creek | 239 | 20 | 20 |
| Belshaw Creek | 227 | 14 | 14 |
| Bridge Creek | 135 | 30 | 49 |
| Butte Creek | 97 | 29 | 29 |
| Canyon Creek | 247 | 29 | 29 |
| Grub Creek | 253 | 14 | 14 |
| John Day River - North Fork | 185 | 113 | 445 |
| John Day River - South Fork | 212 | 61 | 110 |
| Muddy Creek | 116 | 20 | 20 |
| Pine Creek | 112 | 17 | 17 |
| Rock Creek | 22 | 82 | 98 |
| Rock Creek | 204 | 25 | 25 |
| Rowe Creek | 141 | 13 | 13 |
| Strawberry Creek | 263 | 14 | 14 |
| Thirtymile Creek | 83 | 41 | 61 |
* Note: Watershed is mostly rivers/streams 15+ miles in length.
Data from United States Geological Survey