The Winamac series consists of very deep, moderately well drained soils formed in loamy and sandy outwash and the underlying glacial till on till plains.
Permeability is moderately rapid in the loamy outwash and slow in the glacial till.
Slopes range from 0 to 5 percent. Winamac fine sandy loam on a 1 percent slope in a cultivated field at an elevation of 675 feet. The depth to the base of the argillic ranges from 30 to 50 inches. The depth to free carbonates and loamy glacial till ranges from 40 to 60 inches. Rock fragment content ranges from 0 to 5 percent by volume in the loamy and sandy outwash.