The Haverdad series consists of very deep, well drained soils formed in stratified alluvium on flood plains and low terraces.
Permeability is moderate.
Slopes range from 0 to 6 percent. Haverdad loam - on northwest facing drainage of one percent utilized as rangeland. T. 44 N., R. 92 W. 43 degrees 48 minutes 33 seconds north latitude and 107 degrees 50 minutes 23 seconds west longitude. The soil is dry in the moisture control section more than half the time cumulative that the soil temperature at a depth of 20 inches is 41 degrees F. or more. This soil is moist for 60 consecutive days when the soil temperature at 20 inches is 41 degrees F., which occurs about April 21-27, but is dry in all parts of the moisture control section for at least 60 consecutive days from July 15 to October 25 and for at least 90 cumulative days during this period.