The Trail Creek Watershed is located in northern Indiana's LaPorte County, and drains into Lake Michigan at Michigan City's historic lighthouse and marina. The 37,000+ acre watershed is comprised of over 90 miles of rare cold-water fishery streams and tributaries. The watershed lies almost entirely within Michigan, Center, Coolspring, and Springfield Townships, representing 10% of LaPorte County.

The Trail Creek Watershed Partnership is a collaboration of many public and private entities working to keep Trail  Creek clean & cold.