The Guardlake series consists of very deep, well drained soils formed in loamy glaciofluvial deposits overlying sand and gravel outwash on outwash plains, kames, and eskers.
Permeability is moderate in the loamy part and very rapid in the substratum.
Slopes range from 0 to 35 percent. Thickness of the solum and depth to free carbonates ranges from 10 to 24 inches. Volume of gravel ranges from 0 to 25 percent in the solum and from 30 to 50 percent in the substratum. Volume of cobbles ranges from 0 to 7 percent in the solum and from 10 to 30 percent in the substratum. Total rock fragment in the particle size control section averages from 35 to 60 percent.