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Rock River
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Rock River, Illinois and Wisconsin
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Rock River, Illinois and Wisconsin
Rock River, Illinois and Wisconsin

Rock River

river, Illinois-Wisconsin, United States
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Rock River, nonnavigable stream in the north-central United States that originates north of Horicon Marsh, near Brandon in Fond du Lac county, eastern Wisconsin, and flows in a generally southwesterly direction to join the Mississippi River at Rock Island, Illinois. The roughly 300-mile (480-km) river, which from source to mouth drops about 500 feet (150 meters), has small hydropower developments. It drains an area of 10,880 square miles (28,180 square km). The bottomlands along the lower course are subject to spring floods and require levee protection. Major cities along its course include Watertown, Janesville, and Beloit, Wisconsin; and Rockford, Dixon (where future U.S. Pres. Ronald Reagan served as a lifeguard on the river as a teenager), Sterling, and Rock Island, Illinois. Its tributaries include the Pecatonica, Kishwaukee, and Green rivers. On the river bluffs near Oregon, Illinois, in Lowden Memorial State Park, is Lorado Taft’s Black Hawk, a 48-foot- (15-meter-) tall statue of the Sauk leader.

The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Mindy Johnston.