Big Sioux River
Noun
Meaning
a river that rises in northeastern South Dakota and flows southward to join the Missouri River at Sioux City, Iowa
Source: WordNetExamples
At Sioux City the Big Sioux River comes in from the north.
Here in Watertown, the city has built over 20 miles of bike trails that follow the Big Sioux River in town, and loop around Lake Kampeska for a great work out.