West Branch St. Joe River Watershed:
The West Branch St. Joseph River is located in the northeastern corner of the county and accounts for 9 square miles of the county's drainage. It is a part of the Upper St. Joseph Watershed, which is a part of the larger watershed: Western Lake Erie.
The St. Joe River flows through Fort Wayne, Indiana, and outlets into Lake Erie, through the Maumee River. The area contains several lakes, of which Clear Lake is the largest.