Runoff is slow. Permeability is moderate. Soil saturation occurs as high as the surface during periods of March through May in most years in an undrained condition. Commonly used for cultivated crops when drained. Corn and soybeans are generally grown.
Native vegetation is prairie grasses tolerant of wetness.
This soil is extensive. Webster County, Iowa, 1968. The soils now placed in the Harps series were formerly included in the Harpster loam.