River system St. Joseph River Length 45 km Country United States of America | Basin size 450 km (170 sq mi) Mouth St. Joseph River | |
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Main source Southwest Marcellus Township in Cass County, Michigan River mouth St. Joseph River in Three Rivers Discharge Average rate:
1.5–2.0 m/s (53–71 cu ft/s) Sources Cass County, Michigan, Marcellus Township | ||
The Rocky River is a 28.3-mile-long (45.5 km) stream located in the southwest part of the U.S. state of Michigan that flows into the St. Joseph River at 41°56′33″N 85°37′59″W in the city of Three Rivers in St. Joseph County. The Rocky River, along with the St. Joseph River and the Portage River, are the three rivers from which the city of Three Rivers takes its name.
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Map of Rocky River, Michigan, USA
The Rocky River rises in southwest Marcellus Township in Cass County at 41°59′43″N 85°51′04″W. It flows to the northeast, arcing gently to the southeast before turning sharply to the south in eastern Flowerfield Township, shortly after being joined by the Flowerfield Creek. It then flows mostly southward until joining the St. Joseph River in Three Rivers.
The Rocky River watershed encompasses over 112,000 acres (45,000 ha) and drains all or portions of the following cities and townships: