McCoy Creek is a tributary of the St. Joseph River

St. Joseph River (Lake Michigan)

The St. Joseph River is a river, approximately long, in southern Michigan and northern Indiana in the United States. It drains a primarily rural farming area in the watershed of Lake Michigan...

 in southeastern Berrien County, Michigan

Berrien County, Michigan

Berrien County is a county located in the extreme southwest of the U.S. state of Michigan. It is included in the Niles-Benton Harbor, Michigan Metropolitan Statistical Area. As of the 2010 census, the population was 156,813. The county seat is St. Joseph....

.

The headwaters are located in southwestern Bertrand Township

Bertrand Township, Michigan

Bertrand Township is a civil township of Berrien County in the U.S. state of Michigan. As of the 2000 census, the township population was 2,380.- Communities :...

 in Berrien County, and adjacent portions of Olive

Olive Township, St. Joseph County, Indiana

Olive Township is one of thirteen townships in St. Joseph County, Indiana, USA. As of the 2000 census, its population was 3,914.-Geography:According to the United States Census Bureau, Olive Township covers an area of ; of this, is land and is water.-Unincorporated towns:* Hamilton at *...

 and Warren

Warren Township, St. Joseph County, Indiana

Warren Township is one of thirteen townships in St. Joseph County, Indiana, USA. As of the 2000 census, its population was 6,430.-Geography:...

 townships in St. Joseph County, Indiana

St. Joseph County, Indiana

As of the census of 2000, there were 265,559 people, 100,743 households, and 66,792 families residing in the county. The population density was 581 people per square mile . There were 107,013 housing units at an average density of 234 per square mile...

. The main channel flows primarily north (through Bertrand Township) and northeast (through Buchanan Township) for a distance of 6-7 miles (10-11 km) to its confluence with the St. Joseph River at the city of Buchanan

Buchanan, Michigan

Buchanan is a city in Berrien County in the U.S. state of Michigan. The population was 4,681 at the 2000 census. The city is located at the southeast corner of Buchanan Township, about 5 miles west of Niles. It was named after James Buchanan, the 15th President of the United States...

. The McCoy Creek drainage is bounded to the north, northeast, east, and southeast by the St. Joseph River basin, to the south and southwest by the headwaters of the Kankakee River

Kankakee River

The Kankakee River is a tributary of the Illinois River, approximately long, in northwestern Indiana and northeastern Illinois in the United States. At one time the river drained one of the largest wetlands in North America and furnished a significant portage between the Great Lakes and the...

, and to the west and northwest by the Galien River

Galien River

The Galien River is a stream in the southwest region of the U.S. state of Michigan. The river begins at the outlet of Dayton Lake and flows in a predominantly westerly direction until it enters southeastern Lake Michigan at New Buffalo...

basin.