Rock River (Mississippi River tributary)
| Rock River | |
|---|---|
Rock River at Rockford, Illinois | |
Drainage basin of the Rock River | |
| Location | |
| Country | United States |
| States | Wisconsin, Illinois |
| Physical characteristics | |
| Source | |
| • location | Horicon Marsh north of Horicon, Wisconsin |
| • coordinates | 43°28′26″N 88°38′41″W / 43.4738889°N 88.6447222°W |
| Mouth | |
• location | Confluence with the Mississippi River at Rock Island, Illinois |
• coordinates | 41°28′57″N 90°36′58″W / 41.4825326°N 90.6162489°W |
• elevation | 551 ft (168 m) |
| Length | 299 mi (481 km) |
| Discharge | |
| • location | Joslin, Illinois |
| • average | 7,195 cu/ft. per sec. |
| Basin features | |
| Progression | Rock River → Mississippi → Gulf of Mexico |
| GNIS ID | 416824 |
The Rock River is a tributary of the Mississippi River, approximately 299 miles (481 km) long, in the U.S. states of Wisconsin and Illinois. The river was known as the Sinnissippi to the Sauk and Meskwaki peoples; the name means "rocky waters".