LOCATION BIDART CA NVEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, acid Fluvaquentic Cryaquepts
TYPICAL PEDON: Bidart Mucky silt loam on a 0 percent slope at an elevation of 2548 meters. When described on 09/16/2002 the soil was dry to 41 cm and moist down to the water table which was at 145 cm. Colors are for dry soils unless otherwise noted.
Oa--0 to 7 cm; muck; abrupt smooth boundary. (0 to 13 cm thick)
A--7 to 22 cm; grayish brown (10YR 5/2) mucky silt loam, dark brown (10YR 3/3) rubbed moist; 35 percent sand; 62 percent silt; 3 percent clay; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; few fine roots throughout and few very fine roots throughout; 5 percent prominent yellowish red (5YR 5/8), moist, masses of oxidized iron; 1 percent gravel 2 to 5 millimeter and 2 percent gravel 5 to 75 millimeter; strongly acid, pH 5.4 by Chlorophenol red; abrupt smooth boundary. (10 to 25 cm thick)
Bg--22 to 40 cm; grayish brown (10YR 5/2) silt loam, dark brown (10YR 3/3) rubbed moist; 35 percent sand; 62 percent silt; 3 percent clay; moderate fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; few fine roots throughout and few very fine roots throughout; common very fine dendritic tubular pores; 10 percent prominent strong brown (7.5YR 5/8), moist, masses of oxidized iron; 1 percent gravel 5 to 75 millimeter and 1 percent gravel 2 to 5 millimeter; strongly acid, pH 5.4 by Chlorophenol red; abrupt smooth boundary. (10 to 25 cm thick)
C--40 to 43 cm; extremely gravelly coarse sand; 95 percent sand; 5 percent silt; loose, single grain, nonsticky and nonplastic; many fine interstitial pores; 80 percent gravel 2 to 75 millimeter; strongly acid, pH 5.4 by Chlorophenol red; abrupt smooth boundary. (0 to 8 cm thick)
2Bg1--43 to 100 cm; very fine sandy loam, grayish brown (10YR 5/2) interior moist; 60 percent sand; 38 percent silt; 2 percent clay; moderate medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; few fine roots throughout and few very fine roots throughout; many very fine tubular pores; 10 percent prominent strong brown (7.5YR 5/8), moist, masses of oxidized iron; 1 percent gravel 5 to 75 millimeter and 1 percent gravel 2 to 5 millimeter; strongly acid, pH 5.4 by Chlorophenol red;
2Bg2--100 to 150 cm; sandy loam, grayish brown (10YR 5/2) interior moist; 70 percent sand; 27 percent silt; 3 percent clay; soft, very friable, nonsticky and nonplastic; 5 percent gravel 5 to 75 millimeter and 5 percent gravel 2 to 5 millimeter; strongly acid, pH 5.4 by Chlorophenol red;
TYPE LOCATION: El Dorado County, California, in the meadow south of Meiss Lake, 789 feet east and 1213 feet south of Section 9, Township 10N, Range 18E, 38 degrees, 43 minutes, 50 seconds North latitude and 120 degrees, 0 minutes, 51 seconds West longitude, NAD83 - U.S.G.S Quad: Caples Lake, California.
RANGE IN CHARACTERISTICS:
Soil moisture - Usually saturated in some part of the moisture control section during winter, spring, and early summer, usually dry in the upper part with the water table dropping to between 40 and 80 inches during summer and fall. Typic aquic soil moisture regime.
Water features:
Seasonal high water table: 0 to 25 cm
Flooding: frequently
Ponding: frequently
Soil temperature:
5 to 6 degrees C. recorded at 50 cm
Surface rock fragment content:
0 to 5 percent gravel
Reaction: strongly acid
Base saturation: is very low, 5 to 15 percent, where the influence of volcanic parent material is stronger and ranges up to 50 percent where the parent material is more predominantly granodiorite.
Depth to redoximorphic features: 0 to 25 centimeters
Control section: 25 to 100 cm
Rock fragments: 0 to 15 percent, with 0 to 15 percent gravel
Clay content: averages 2 to 15 percent clay
Mineralogy: mixed
A horizon:
Hue: 10YR
Value: 5 dry; 3 moist
Chroma: 2 dry; 3 moist
Organic matter: 10 to 20 percent
Redoximorphic features: Masses of oxidized iron
Texture of the fine earth fraction: Mucky silt loam
Clay content: 1 to 15 percent
Rock fragments: 0 to 15 percent mostly in the 2 to 5 mm range
Reaction: 4.5 to 6
C horizon:
The C horizon as described above is typical of deposition in the meadows from high flood events. Colors are typically those of the sand grains or small gravel. Some areas have this material on the surface and it is thought to be from the rain on snow event of 1996.
Organic matter: 0 to 2 percent
Texture of the fine earth fraction: Coarse sand
Clay content: 0 to 3 percent
Rock fragments: 35 to 90 percent mostly in the 2 to 5 mm range
Reaction: 4.5 to 6.0
Bg horizons:
Hue: 10YR
Value: 4 through 6 dry; 2 through 6 moist
Chroma: 2 or 3 dry; 2 or 3 moist
Organic matter: 1 to 10 percent
Redoximorphic features: Masses of oxidized iron
Texture of the fine earth fraction: Coarse sandy loam, sandy loam, very fine sandy loam, silt loam
Clay content: 0 to 15 percent
Rock fragments: 0 to 15 percent mostly in the 2 to 5 mm range
Reaction: 4.5 to 6.0
COMPETING SERIES: There are no other series in this family at this time.
GEOGRAPHIC SETTING: The Bidart soils are on flood plains . Slopes range from 0 to 2 percent. These soils formed in alluvium derived from mixed materials. Elevation is 2130 to 2825 meters. The climate is subhumid with warm dry summers and cold wet winters. The mean annual precipitation is 840 to 1650 millimeters and the mean annual air temperature is 3 to 5 degrees C. The frost free season is 20 to 60 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dagget and Meiss soils. The Dagget soils are excessively drained and are deep to soft granodiorite bedrock and the Meiss soils are excessively drained and are shallow to hard volcanic bedrock. Both of these soils are on the mountain slopes surrounding the flood plains containing the Bidart series.
DRAINAGE AND PERMEABILITY: Very poorly drained, moderately rapid permeability, negligible runoff. Occasional to frequent flooding for long duration beginning March and April with the spring runoff and less frequently in January with rain on snow events, frequent ponding for long duration with a time frame the same as the flooding.
USE AND VEGETATION: This soil is used for wildlife and recreation and has been used for grazing. Vegetation is Nebraska sedge, tufted hairgrass, and carex.
DISTRIBUTION AND EXTENT: Bidart is of minor extent in California and Nevada in MLRA 22A -- Sierra Nevada Mountains
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: El Dorado County, (Tahoe Basin area), California. Source of name from nearby ranch.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle Size Control Section for this pedon: 25 to 100 cm, Bg, C, 2Bg1
Redox Concentrations: 7 to 100 cm A, Bg, 2Bg1
Cambic Horizon: 22 to 100 cm Bg, 2Bg1, 2Bg2