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Rock River
| States | Illinois (165 mi), Wisconsin (134 mi) |
| Length | 298.7 miles |
| Watershed Length* | 2,812 miles |
| Mouth | Mississippi River ⤏ Gulf of Mexico |
| GNIS | 416824 |
Tributaries
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| Name | Distance from Mouth (miles) | Length (miles) | Watershed Length (miles) |
|---|---|---|---|
| Ashippun River | 264 | 33 | 33 |
| Bark River | 214 | 70 | 88 |
| Bass Creek | 174 | 20 | 20 |
| Coon Creek | 50 | 26 | 26 |
| Crawfish River | 221 | 77 | 213 |
| Elkhorn Creek | 66 | 56 | 71 |
| Franklin Creek | 100 | 18 | 18 |
| Green River | 13 | 89 | 156 |
| Johnson Creek | 226 | 21 | 21 |
| Kishwaukee River | 133 | 64 | 347 |
| Koshkonong Creek | 204 | 55 | 55 |
| Kyte River | 110 | 32 | 32 |
| Leaf River | 118 | 31 | 31 |
| Marsh Creek | 186 | 15 | 15 |
| Mill Creek | 121 | 17 | 17 |
| Mill Creek | 4 | 23 | 23 |
| North Kinnikinnick Creek | 155 | 15 | 15 |
| Oconomowoc River | 251 | 41 | 41 |
| Otter Creek | 206 | 18 | 18 |
| Pecatonica River | 160 | 194 | 822 |
| Pine Creek | 96 | 23 | 23 |
| Rock Creek | 42 | 53 | 68 |
| Rock River - East Branch | 299 | 45 | 63 |
| Rock River - West Branch | 299 | 38 | 58 |
| Rubicon River | 280 | 32 | 32 |
| Saunders Creek | 197 | 17 | 17 |
| Silver Creek | 241 | 16 | 16 |
| South Kinnikinnick Creek | 155 | 14 | 14 |
| Stillman Creek | 124 | 18 | 18 |
| Threemile Branch | 78 | 22 | 22 |
| Turtle Creek | 165 | 44 | 60 |
| Yahara River | 193 | 63 | 63 |
* Note: Watershed is mostly rivers/streams 15+ miles in length.
Data from United States Geological Survey