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Niobrara River
| States | Nebraska (498 mi), Wyoming (73 mi) |
| Length | 570.9 miles |
| Watershed Length* | 2,870 miles |
| Mouth | Missouri River ⤏ Gulf of Mexico |
| GNIS | 835960 |
Tributaries
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| Name | Distance from Mouth (miles) | Length (miles) | Watershed Length (miles) |
|---|---|---|---|
| Antelope Creek | 268 | 44 | 44 |
| Ash Creek | 81 | 16 | 16 |
| Barngrover Creek | 389 | 25 | 25 |
| Bear Creek | 212 | 45 | 45 |
| Beaver Creek | 68 | 22 | 22 |
| Big Sandy Creek | 56 | 33 | 33 |
| Box Butte Creek | 315 | 53 | 53 |
| Brush Creek | 50 | 23 | 23 |
| Cottonwood Creek | 335 | 27 | 44 |
| Deer Creek | 295 | 20 | 20 |
| Duck Creek | 513 | 35 | 56 |
| Eagle Creek | 35 | 21 | 59 |
| Fairfield Creek | 122 | 33 | 33 |
| Gordon Creek | 167 | 154 | 154 |
| Keya Paha River | 60 | 129 | 495 |
| Leander Creek | 226 | 26 | 26 |
| Long Pine Creek | 98 | 42 | 117 |
| Medicine Creek | 202 | 25 | 25 |
| Minnechaduza Creek | 152 | 71 | 88 |
| Pepper Creek | 326 | 27 | 27 |
| Pine Creek | 302 | 33 | 33 |
| Plum Creek | 110 | 47 | 142 |
| Redbird Creek | 29 | 44 | 67 |
| Red Otter Creek | 20 | 15 | 15 |
| Rush Creek | 289 | 34 | 77 |
| Sand Canyon Creek | 338 | 42 | 42 |
| Schlagel Creek | 160 | 20 | 20 |
| Silver Springs Creek | 537 | 18 | 32 |
| Snake River | 175 | 126 | 226 |
| Spring Creek | 307 | 15 | 15 |
| Steel Creek | 19 | 20 | 20 |
| Turkey Creek | 43 | 17 | 17 |
| Van Tassell Creek | 500 | 18 | 18 |
| Verdigre Creek | 5 | 25 | 136 |
| Whistle Creek | 412 | 18 | 18 |
| Willow Creek | 353 | 16 | 16 |
* Note: Watershed is mostly rivers/streams 15+ miles in length.
Data from United States Geological Survey