LOCATION ROGGER OREstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Ultic Haploxerolls
TYPICAL PEDON: Rogger very gravelly fine sandy loam, forested on a 18 percent north facing slope. (Colors are for moist soil unless otherwise noted.)
Oi--2 inches to 0; ponderosa pine and white fir needles.
A1--0 to 5 inches; very dark brown (10YR 2/2) very gravelly fine sandy loam, dark brown (10YR 4/3) dry; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; many roots; many irregular pores; 5 percent stones, 10 percent cobbles, 25 percent gravel; slightly acid (pH 6.4); clear wavy boundary. (4 to 10 inches thick)
A2--5 to 12 inches; very dark grayish brown (10YR 3/2) very gravelly fine sandy loam; dark brown (10YR 4/3) dry; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; many roots; many irregular pores; 5 percent stones, 10 percent cobbles, 25 percent gravel; slightly acid (pH 6.2); gradual wavy boundary. (5 to 10 inches thick)
AB--12 to 21 inches; dark yellowish brown (10YR 3/4) very gravelly fine sandy loam, yellowish brown (10YR 5/3) dry; moderate very fine granular structure; soft, very friable, nonsticky and nonplastic; common roots; common very fine and fine irregular pores; 10 percent cobbles, 30 percent gravel; slightly acid (pH 6.3); gradual wavy boundary. (0 to 11 inches thick)
Bw--21 to 36 inches; dark yellowish brown (10YR 3/4) very cobbly loam, yellowish brown (10YR 5/4) dry; weak fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and nonplastic; few roots; common very fine and fine irregular pores; 25 percent cobbles, 30 percent gravel; slightly acid (pH 6.3). (10 to 20 inches thick)
Cr--36 inches; weathered basalt.
TYPE LOCATION: Lake County, Oregon; SW1/4, SW1/4 of section 18, T. 40 S., R. 22 E.
RANGE IN CHARACTERISTICS: The soils are moist in the winter and spring and are dry for 60 to 100 consecutive days after the summer solstice. The mean annual soil temperature is 45 to 47 degrees F. The mollic epipedon is 10 to 20 inches thick. The base saturation by ammonium acetate is 50 to 75 percent throughout the solum. The base saturation by sum of cations is 35 to 50 percent throughout the solum. Depth to paralithic contact is 20 to 40 inches. The particle-size control section averages 35 to 60 percent rock fragments and 10 to 18 percent clay.
The A horizon has hue of 7.5YR or 10YR, value of 2 or 3 when moist and 3 or 4 when dry, and chroma of 2 or 3 when moist and 3 or 4 when dry.
The Bw horizon has a hue of 7.5YR or 10YR, value of 3 or 4 when moist and 4 or 5 when dry, and chroma of 3 or 4 when moist and 4 when dry. It is loam or fine sandy loam. Rock fragments average from 35 to 60 percent of which 10 to 30 percent are cobbles and stones, and 25 to 50 percent are gravel.
COMPETING SERIES: These are the Bearspring, Dogtown, Grousecreek, Mineral, Patio, Sutkin, Wellscreek and Zeb series. The Bearspring, Dogtown, Grousecreek, Sutkin, Wellscreek and Zeb series are over 40 inches deep to bedrock. The Mineral and Patio soils are 20 to 40 inches deep to a lithic contact.
GEOGRAPHIC SETTING: Rogger soils are on plateaus and mountainsides at elevations of 5,500 to 7,200 feet. Slopes are 0 to 60 percent. The soils formed in colluvium and residuum primarily from andesite, basalt and tuff. The climate is characterized by cool moist winters and warm dry summers. The mean annual precipitation is 28 to 32 inches. The mean annual air temperature is 43 to 45 degrees. The frost-free period is 30 to 50 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Mound, Polander, Twelvemile and Woodchopper soils. The Mound and Woodchopper soils have argillic horizons. Mound soils are clayey-skeletal in the particle-size control section. Woodchopper soils are fine in the particle-size control section. Polander and Twelvemile soils have andic soil properties and are ashy and ashy-skeletal, respectively.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability.
USE AND VEGETATION: The soils are forested and used for watershed, wildlife habitat, timber production, and recreation. Vegetation is ponderosa pine, white fir, common snowberry, heartleaf arnica, and wheeler bluegrass.
DISTRIBUTION AND EXTENT: South central Oregon, MLRA 21. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Lake County; Oregon; Southern Part; 1991.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - 0 to 12 inches; base saturation by NH4OAC is 50 to 60 percent (A1, A2 horizons)
Cambic horizon - 12 to 36 inches (AB, Bw horizons)
Ultic subgroup - base saturation by sum of cations is 35 to 50 percent throughout the soil.
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.
ADDITIONAL DATA: Laboratory data for 3 horizons (A1, A2, AB), pedon number S87OR-037-003. Forest Service vegetative site CW-S3-13
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.