LOCATION REDMOUNT OR+ID
Established Series
Rev. WEL/RJK/KP
10/2026
REDMOUNT SERIES
The Redmount series consists of very deep, well drained soils that formed in alluvium and glaciofluvial outwash with an influence of loess and minor amounts of volcanic ash in the surface. These soils are on fan remnants and broad outwash plains. Slopes are 0 to 8 percent. Mean annual precipitation is about 400 mm, and mean annual temperature is about 6 degrees C.
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Pachic Haploxerolls
TYPICAL PEDON: Redmount silt loam in farmland. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 23 cm; very dark gray (10YR 3/1) silt loam, black (10YR 2/1) moist; moderate fine and medium granular structure; slightly hard, friable, nonsticky and nonplastic; common very fine roots; common very fine irregular pores; 10 percent gravel; slightly alkaline (pH 7.6); clear smooth boundary.
A--23 to 30 cm; very dark grayish brown (10YR 3/2) silt loam, black (10YR 2/1); moderate fine and medium granular structure; slightly hard, friable, nonsticky and nonplastic; common very fine roots; common very fine tubular and irregular pores; 5 percent gravel; slightly alkaline (pH 7.8); clear smooth boundary.
Bw1--30 to 51 cm; dark grayish brown (10YR 4/2) loam, very dark brown (10YR 2/2); moderate fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine roots; many very fine tubular pores; 5 percent gravel; slightly alkaline (pH 7.8); gradual smooth boundary.
Bw2--51 to 81 cm; dark grayish brown (10YR 4/2) sandy loam, very dark brown (10YR 2/2); weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; few fine roots; many very fine tubular pores; 5 percent gravel; slightly alkaline (pH 7.6); clear smooth boundary.
2C1--81 to 107 cm; brown (10YR 4/3) very gravelly sandy loam, very dark grayish brown (10YR 3/2); single grain; loose, very friable, nonsticky and nonplastic; few very fine roots; many very fine irregular pores; 40 percent gravel; slightly alkaline (pH 7.6); gradual smooth boundary.
2C2--107 to 152 cm; brown (10YR 4/3) very gravelly sandy loam, very dark grayish brown (10YR 3/2); single grain; loose, very friable, nonsticky and nonplastic; many very fine and fine irregular pores; 55 percent gravel; slightly alkaline (pH 7.6).
TYPE LOCATION: Wallowa County, Oregon; USGS Chief Joseph Mountain topographic quadrangle; latitude 45.371111 degrees north, longitude 117.273889 degrees west, datum WGS84.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3.3 to 8.3 C
Thickness of mollic epipedon--51 to 91 cm
Particle-size control section (weighted averages)
Clay content--10 to 18 percent clay
Total rock fragments--0 to 35 percent
A horizon
Value--2 or 3 moist, 3 or 4 dry
Chroma--1 or 2
Texture (less than 2 mm fraction)--loam, silt loam
Clay content--10 to 20 percent
Rock fragments--0 to 25 percent gravel
Reaction--pH 6.6 to 7.8
Thickness--5 to 38 cm
Bw horizons
Value--2 or 3 moist, 3 or 4 dry
Chroma--1 or 2 moist and dry
Texture (less than 2 mm fraction)--silt loam, loam, sandy loam, fine sandy loam
Clay content--10 to 20 percent
Rock fragments--0 to 30 percent gravel
Reaction--pH 6.6 to 7.8
Thickness--25 to 64 cm
2C horizon
Value--3 or 4 moist, 4 or 5 dry
Chroma--2 to 4 moist and dry
Texture (less than 2 mm fraction)--sandy loam, loamy sand
Clay content--5 to 10 percent
Rock fragments--35 to 90 percent-35 to 70 percent gravel, 0 to 15 percent cobbles, and 0 to 5 percent stones
COMPETING SERIES:
Cinderspring(T) (ID)--soils have a cambic horizon
Iver (NV)--soils have a cambic horizon and slopes 30 to 75 percent
Kabear (ID)-- soils do not have skeletal 2C horizons
Ola (ID)--soils are moderately deep to lithic contact
Prucree (ID)--soils are moderately deep to paralithic contact
Shively (NV)--soils are deep to paralithic contact
Suryon (ID)--soils do not have skeletal 2C horizons
Taterpa (OR)--soils are deep to paralithic contact
Wagore (NV)--soils are aridic bordering on xeric
GEOGRAPHIC SETTING:
Landform--fan remnants, broad outwash plains
Elevation--1,040 to 1,910 meters
Slope--0 to 8 percent
Parent material--alluvium and glaciofluvial outwash with an influence of loess and minor amounts of volcanic ash in the surface
Mean annual precipitation--325 to 500 mm
Mean annual air temperature--2.2 to 7.2 degrees C
Frost-free period--60 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained, 5 to 50 um/sec
USE AND VEGETATION: Redmount soils are primarily used for irrigated hay and pasture, and small grains. The potential native vegetation is Idaho fescue and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: Remount soils are of small extent in northeastern Oregon and southeastern Idaho; MLRAs 9 and 13.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Wallowa County, Oregon, 1998.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon--0 to 81 cm (Ap, A, Bw1, and Bw2 horizons)
Particle-size control section--25 to 100 cm
Redmount soils have a frigid temperature regime and a xeric moisture regime.
Note: (02/2001) The original type location for the Redmount series was located in an area with a mesic temperature regime. The modal profile described in this revised series description reflects a change of location to a frigid area.
Taxonomic version: Twelfth Edition, 2014
National Cooperative Soil Survey
U.S.A.