Definition of rock river in English English dictionary
A river rising in southeast Wisconsin and flowing about 459 km (285 mi) generally south and southwest to the Mississippi River in northwest Illinois. River, north-central U.S. It rises in southeastern Wisconsin and flows across the northwestern corner of Illinois, emptying into the Mississippi River at Rock Island, Ill. ; it is 300 mi (480 km) long. The bottomlands along the lower course are subject to spring floods and require levee protection