Coldwater River (Branch County)

For other rivers in Michigan with the same name, see Coldwater River (Michigan).

Coldwater River is a stream in the U.S. state of Michigan. Located in Branch County , the river rises in Ovid Township as the outflow of Coldwater Lake and Lake of the Woods. The river flows mostly north and west past the city of Coldwater and empties into the St. Joseph River in the village of Union City at 42°03′58″N 85°07′48″W / 42.06611, -85.13. The Coldwater River drainage basin includes nearly the entire eastern half of Branch County and portions of Allen and Reading townships in western Hillsdale County.

Major tributaries (from the mouth):

Hog Creek, flows into the Coldwater River at Hodunk, Michigan
- North Branch Hog Creek, rises in section 23 of Butler Township
- South Branch Hog Creek, rises out of a complex of lakes in eastern Reading Township in Hillsdale County
  - Bagley Creek, rises in Quincy Township just north of the village of Quincy
  - Bowen Creek, rises in sections 31 and 32 in the southwest corner of Litchfield Township in Hillsdale County
  - Little Hog Creek, rises section 2 in the northeast corner of Reading Township in Hillsdale County
The outflow of Miller Lake in northeast Batavia Township
Mud Creek/Cold Creek rises in southeast Butler Township
East Branch Coldwater River/Sauk River, formed from the outflow of Marble Lake in Quincy Township
- A complex of lakes in Quincy, Algansee and Ovid Township, including Marble Lake, Middle Lake, Lake Bartholomew, Mud Lake, and Long Lake connect with Coldwater Lake to the south, which also forms the headwaters of the main branch of the Coldwater River
  - Fisher Creek, flows into Marble Lake and rises in sections one and two in northeast California Township
  - Tallahasse Creek/Drain flows into Mud Lake and rises in section 22 of California Township, just north of Ray