The Dubuque series consists of well drained, moderately deep soils formed in loess and a thin layer of residuum overlying limestone bedrock at a depth of 20 to 40 inches.
Permeability is moderate in the upper part of the solum and slow in the horizon formed in residuum.
Slopes range from 2 to 60 percent. Mean annual temperature is about 48 degrees F, and mean annual precipitation is about 34 inches. Some of the limestone fragments can be separated and have small amounts of reddish clayey material between them. Solum thickness typically is about 24 inches but ranges from 20 to 40 inches. A lithic contact with limestone bedrock is between 20 and 40 inches below the surface.