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The Salamonie Watershed drains about 360,000 acres. The watershed is centered around the Salamonie River, which flows in a generally west-northwest direction from its headwaters in Jay County to the Wabash River, near Lagro in Wabash County. Along the way it backs up behind a dam that forms the Salamonie Reservoir. The watershed drains large portions of Blackford County, Jay County, and Huntington County and parts of three other counties.
Notable tributaries of the Salamonie River include the Little Salamonie River, Prairie Creek, Black Creek, Brooks Creek, Majenica Creek, and Richland Creek. After joining the Wabash, waters from the Salamonie River make their way to the Ohio River and thence into the Mississippi River and on to the Gulf of Mexico.