Moderately well drained. A perched seasonal high water table is at a depth of 2.0 to 3.5 feet at some time between February and April in normal years. The potential for surface runoff is low or medium. Permeability is moderate in the solum and moderately slow in the substratum. Most areas are used to grow corn, soybeans, wheat, oats, and hay.
Native vegetation is prairie grasses.
Central and northern Illinois and south-central Wisconsin. Ford County, Illinois, 1929. Previously correlated Saybrook soils that developed in silt loam glacial till in eastern Illinois are part of the glacial moraine in which the Graymont series has been established. The differentiating criteria would be greater than or less than about 50 percent silt in the glacial till.