The Hennepin series consists of very deep, well drained soils formed in calcareous glacial till. These soils are on upland side slopes that border stream valleys and on moraines.
Permeability is moderate or moderately slow.
Slopes range from 10 to 70 percent. Mean annual temperature is about 52 degrees F, and mean annual precipitation is about 35 inches. The solum is 10 to 20 inches in thickness. The control section commonly averages between 20 and 27 percent clay. The clay content ranges between 18 and 30 percent and the fine sand and coarser sand content ranges between 15 and 55 percent.