Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States: STATSGO Soil Characteristics
This data set represents estimated soil variables compiled for every catchment of NHDPlus 
for the conterminous United States. The variables included are cation exchange capacity, 
percent calcium carbonate, slope, water-table depth, soil thickness, hydrologic soil group, 
soil erodibility (k-factor), permeability, …