The Swede series consists of deep or very deep, well drained soils that formed in mixed alluvial material from basaltic and granitic sources. Swede soils are on alluvial fans and colluvial footslopes and have slopes of 1 to 60 percent.
Permeability is moderately slow.
Swede silt loam, rangeland. Buffork, Cific, Inchau, Lymonson, Tripit and Troutdale soils have a paralithic contact at depths of 20 to 40 inches. Amsden, Gebson, Gelkie, Leavitt, Michelson, Monida, Morset, Oro Fino, Philpsburg, Tingey and Wellsville soils have a Bk horizon. Croftshaw soils have average annual soil temperature of less than 39 degrees F. Croydon soils have 2.5Y or 5Y colors. Hourglass soils average 20 to 35 percent rock fragments in the control section.