IDENTIFIERS

  • Current Taxon Name (Soil Name): Trabuco
  • OSD
  • Series Extent
  • User Site ID: S1968CA057030
  • User Pedon ID: S1968CA057030
  • Vegetation Plot ID: S1968CA057030
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 68C0117
  • NCSS Pedon Lab Data NASIS Record ID - 43572
  • Print Date: 4/29/2025

    • LOCATION

  • Location In Web Soil Survey
  • AOI is roughly a square mile and pedon is marked in the center.
  • Location in SoilWeb
  • Location in Google Maps
  • Std. Latitude: 39.2288895
  • Std. Longitude: -121.2013855
  • Datum: WGS84
  • Township: 16N
  • Range: 7E
  • Section: 21
  • PLSS Details: 1,000 feet east and 1,100 feet south of W 1/4 corner
  • Location Description: 1,350 feet east of Pleasant Valley Road, 7.5 miles west of Grass Valley, California
  • State: California
  • County: CA057—Nevada
  • MLRA: 22A—Sierra Nevada and Tehachapi Mountains
  • Non-MLRA Soil Survey Area: CA619—Nevada County Area, California

    • PEDON

  • Describers Name: L. A. Brittan, G. Staidl.
  • Current Taxonomic Class: Fine-loamy, mixed, superactive, thermic Typic Argixerolls
  • Current Taxon Kind: taxadjunct
  • Pedon Type: taxadjunct to the series
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 30
  • Correlated Information:
  • Soil Name - Trabuco
  • PSC - 25 to 76 cm.
  • Classificaton Date - 7/23/2007
  • Moisture Class - xeric
  • Sampled As Information:
  • Soil Name - Trabuco
  • Classificaton Date - 9/4/1968
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Landscape: mountains
  • Landform: louderback
  • Slope Shape Down: convex
  • Runoff: medium
  • Drainage Class: well
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 9/4/1968 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - grass/herbaceous cover
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
    • Vegetation Plot Plants
    Plant Symbol Scientific Name National Vernacular Name Plant Type Group Canopy Cover % Vegetation Stata Level

    QUDO

    Quercus douglasii

    blue oak

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    Setting and Climate
    Slope Slope Length USLE Upslope Length Elev. Corr. Elev Aspect MAP REAP FFD MAAT MSAT MWAT MAST MSST MWST MFFP PE Index Climate Station ID Climate Station Name Climate Station Type
    % m degrees mm mm C mm

    10

    —

    —

    384

    —

    135

    889

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    —

    16.1

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    AP1—0 to 10 centimeters (0.0 to 3.9 inches); fragments. Lab sample # 68C00882
    AP—0 to 10 centimeters (0.0 to 3.9 inches); brown (7.5YR 5/4), dark brown (7.5YR 3/2), moist; loam; 3 percent yellowish red (5YR 5/8) fine distinct and 3 percent red (2.5YR 4/6) fine distinct and 3 percent yellowish red (5YR 5/8) fine distinct and 3 percent red (2.5YR 4/6) fine distinct mottles; moderate very coarse platy structure; hard when dry, friable, slightly sticky, slightly plastic; 3.0 very fine roots and 0.5 fine roots; 3.0 very fine interstitial and tubular pores; fragments; strongly acid, pH 5.5, hellige-truog; abrupt smooth boundary. Lab sample # 68C00875
    A12—10 to 25 centimeters (3.9 to 9.8 inches); brown (7.5YR 5/4), dark reddish brown (5YR 3/3), moist; loam; 3 percent red (2.5YR 4/8) fine prominent and 3 percent dark red (2.5YR 3/6) fine prominent mottles; weak coarse prismatic structure; hard when dry, friable, moderately sticky, moderately plastic; 3.0 very fine and fine roots; 3.0 very fine interstitial and tubular pores; fragments; slightly acid, pH 6.2, hellige-truog; clear wavy boundary. Lab sample # 68C00876
    B1—25 to 38 centimeters (9.8 to 15.0 inches); reddish brown (5YR 4/4), dark reddish brown (5YR 3/4), moist; clay loam; weak medium and coarse prismatic structure; hard when dry, friable, moderately sticky, moderately plastic; 0.5 very fine roots and 0.5 medium and coarse roots; 3.0 very fine interstitial and tubular pores; 10 percent clay films in root channels and/or pores and 10 percent clay bridges; fragments; slightly acid, pH 6.2, hellige-truog; clear wavy boundary. Lab sample # 68C00877
    B21T—38 to 69 centimeters (15.0 to 27.2 inches); reddish brown (5YR 5/4), dark reddish brown (5YR 3/4), moist; clay; moderate coarse prismatic parts to moderate coarse angular blocky structure; very hard, firm, moderately sticky, very plastic; 0.5 very fine to coarse roots; 3.0 very fine tubular pores; clay films on faces of peds and in pores; fragments; slightly acid, pH 6.2, hellige-truog; gradual wavy boundary. Lab sample # 68C00878. Light mineral grains apparent.; continuous - phpvsfiid 188716; continuous - phpvsfiid 188716
    B22T—69 to 99 centimeters (27.2 to 39.0 inches); brown (7.5YR 5/4), dark reddish brown (5YR 3/4), moist; clay; moderate medium prismatic parts to moderate coarse angular blocky structure; very hard, firm, moderately sticky, very plastic; 0.5 very fine roots; 0.5 very fine tubular pores; clay films in root channels and/or pores and 75 percent dusky red (2.5YR 3/2), moist, clay films on faces of peds; mica flakes, unspecified; fragments; slightly acid, pH 6.2, hellige-truog; gradual wavy boundary. Lab sample # 68C00879. Light mineral grains apparent.; continuous - phpvsfiid 188718; continuous - phpvsfiid 188718
    B3T—99 to 130 centimeters (39.0 to 51.2 inches); pale brown (10YR 6/3), brown (10YR 4/3), moist; clay; weak medium prismatic parts to weak coarse angular blocky structure; hard when dry, firm, moderately sticky, very plastic; 0.5 very fine and fine roots; 0.5 very fine tubular pores; 75 percent dark red (2.5YR 3/6), dry, clay films in root channels and/or pores and 75 percent dark reddish brown (2.5YR 3/3), moist, clay films in root channels and/or pores; fragments; slightly acid, pH 6.2, hellige-truog; gradual wavy boundary. Lab sample # 68C00880. Mica and light mineral grains apparent.
    C—130 to 168 centimeters (51.2 to 66.1 inches); light yellowish brown (10YR 6/4), brown (7.5YR 4/4), moist; clay loam; massive; hard when dry, firm, moderately sticky, very plastic; 0.1 very fine roots; 0.5 very fine tubular pores; 30 percent red (2.5YR 4/6), dry, clay films in root channels and/or pores and 30 percent dark red (2.5YR 3/6), moist, clay films in root channels and/or pores and 30 percent clay bridges; fragments; moderately acid, pH 6.0, hellige-truog. Lab sample # 68C00881. Mica and other light mineral grains apparent.