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The Rock River is a tributary of the Mississippi
River, approximately 285 mi (459 km) long, in the U.S. states of Wisconsin and Illinois.
It rises in southeast Wisconsin, in southwest Fond du Lac County, approximately 10 mi (16 km) south of Ripon and 25 mi (40 km) southwest of Lake
Winnebago. It flows south, through the Horicon National Wildlife Refuge, then meanders southward draining the area of
southeast Wisconsin between the Wisconsin River and Lake Michigan. It passes Watertown, Jefferson, and
Fort Atkinson. In northern Rock County it receives the Yahara River, and flows southward past
Janeswille and Beloit into northern Illinois, where it receives the Pecatonica River 5 mi (8 km) south of the state line.
It flows south through Rockford, then southwast across
northwestern Illinois. passing Dixon and Rock Falls, where it becomes navigable. It joins the Mississippi
at Rock Island.
See also
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