LOCATION CAMADO CO
Established Series
Rev. JPP/KLS
04/2018
CAMADO SERIES
The Camado series consists of shallow, well drained soils that formed in slope alluvium or colluvium derived from shale and sandstone. Camado soils are on hillslopes. Slopes range from 5 to 45 percent. Mean annual precipitation is about 410 mm and the mean annual temperature is about 7.8 degrees C.
TAXONOMIC CLASS: Clayey, smectitic, mesic, shallow Aridic Haplustalfs
TYPICAL PEDON: Camado loam, on a south facing, simple, 17 percent slope in ponderosa pine woodland at an elevation of 2,073 meters. (Colors are for dry soil unless otherwise noted.) When described on July 16, 2003 the soil was dry from 0 to 46 cm. The surface is covered by 3 percent cobbles.
A1--0 to 3 cm; pale brown (10YR 6/3) loam, brown (10YR 4/3) moist; moderate medium platy structure parting to moderate fine granular; soft, very friable, nonsticky, slightly plastic; few very fine roots; few fine tubular pores; 5 percent gravel, 3 percent cobbles; neutral (pH 6.8); clear smooth boundary.
A2--3 to 8 cm; brown (10YR 5/3) clay loam, brown (10YR 4/3) moist; weak medium platy structure parting to moderate fine granular; soft, friable, moderately sticky, moderately plastic; few fine and very fine roots; few very fine tubular pores; 5 percent gravel, 3 percent cobbles; neutral (pH 6.8); clear smooth boundary. (combined thickness of A1, A2 - 8 to 25 cm)
Bt1--8 to 23 cm; brown (7.5YR 5/3) gravelly sandy clay, brown (7.5YR 4/3) moist; moderate medium subangular blocky structure parting to moderate fine subangular blocky; hard, firm, very sticky, very plastic; few fine and common very fine roots; few fine tubular pores; common distinct clay films on faces of peds; 15 percent gravel, 5 percent cobbles; neutral (pH 6.8); clear smooth boundary.
Bt2--23 to 46 cm; brown (7.5YR 5/3) gravelly clay, brown (7.5YR 4/3) moist; moderate medium angular blocky structure parting to moderate fine angular blocky; very hard, firm, very sticky, very plastic; few fine roots; few fine tubular pores; many distinct clay films on faces of peds; 20 percent gravel; neutral (pH 6.8); clear wavy boundary. (combined thickness of Bt1, Bt2 - 10 to 55 cm)
Cr--46 to 71 inches; weathered sandstone and shale; neutral (pH 6.8).
TYPE LOCATION: Archuleta County, Colorado; about 8 kilometers north of Pagosa Junction; located about 671 meters south and 366 meters west of the northeast corner of Sec. 28, T. 33 N., R. 3 W.; Pagosa Junction USGS quad; Lat. 37 degrees 4 minutes 33 seconds N., Long. 107 degrees 10 minutes 41 seconds W., NAD 27.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 8.3 to 9.4 degrees C.
Mean summer soil temperature: 15.0 to 16.1 degrees C.
Depth to paralithic contact: 25 to 51 cm to shale and sandstone
Depth to argillic horizon: 8 to 18 cm
Particle-size control section (weighted average):
Clay content: 35 to 45 percent
Rock fragments: 10 to 30 percent
A1 horizon
Hue: 7.5YR or 10YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 2 or 3, dry or moist
Texture: loam
Clay content: 20 to 27 percent
Rock fragments: 5 to 15 percent gravel and cobbles
Reaction (pH): 6.1 to 7.3
A2 horizon
Hue: 7.5YR or 10YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 2 or 3, dry or moist
Texture: clay loam
Clay content: 27 to 32 percent
Rock fragments: 5 to 15 percent gravel and cobbles
Reaction (pH): 6.1 to 7.3
Bt1, Bt2 horizons
Hue: 7.5YR or 10YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 to 6, dry or moist
Texture, fine fraction: clay, sandy clay, clay loam
Clay content: 35 to 45 percent
Rock fragments: 10 to 30 percent gravel and cobbles
Reaction (pH): 6.1 to 7.3
COMPETING SERIES: None listed.
GEOGRAPHIC SETTING:
Landform - hillslopes
Elevation - 2,040 to 2,260 meters
Slope - 5 to 45 percent
Parent material - slope alluvium or colluvium derived from shale and sandstone
Mean annual air temperature - 7.0 to 8.5 degrees C.
Mean annual precipitation - 380 to 430 mm
Precipitation pattern - Driest months are May and June, wettest months are July and August.
Soil moisture: The soil moisture control section is dry for more than 15 consecutive days between May 15 and July 15; ustic moisture regime bordering on aridic.
Frost-free period - 100 to 110 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Well drained, high runoff, slow permeability.
USE AND VEGETATION: Used for timber production, livestock grazing, wildlife habitat. Native vegetation is ponderosa pine, Rocky Mountain Juniper, Gambel oak, Antelope bitterbrush, blue gramma, galleta, and western wheatgrass.
DISTRIBUTION AND EXTENT: Southwestern Colorado. LRR D, MLRA 36. This series is of small extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Archuleta County, Colorado, Archuleta soil survey area, 2004. The name is taken from a creek in the vicinity.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Argillic horizon: 8 to 46 cm (Bt1, Bt2 horizons)
Paralithic contact: 46 cm to weathered sandstone and shale (Cr horizon)
Particle size control section: 8 to 46 cm (Bt1, Bt2 horizons)
Camado soils have a mesic temperature regime and are in an ustic soil moisture regime bordering on aridic.
National Cooperative Soil Survey
U.S.A.