LOCATION REDRIVER CAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Andic Haploxerepts
TYPICAL PEDON: Redriver stony sandy loam, forested, on a 2 percent slope under Jeffrey pine and white fir at 5,200 feet elevation. (When described September 15, 1983, the soil was nearly dry throughout. Colors are for dry soil unless otherwise noted).
0--1 to 0 inches; decomposed needles, cones and twigs.
A--0 to 6 inches; dark brown (10YR 3/3) stony sandy loam, dark brown (7.5YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and slightly plastic; common very fine, few fine and medium roots; many very fine interstitial pores; 5 percent stones, 30 percent pebbles; sodium fluoride pH is 10.5 after 2 minutes; slightly acid (pH 6.5); clear wavy boundary (2 to 6 inches thick)
AB--6 to 16 inches; brown (7.5YR 4/4) extremely cobbly sandy loam, dark reddish brown (5YR 3/4) moist; weak fine granular structure; soft, very friable, nonsticky and slightly plastic; common very fine few fine and medium roots; many very fine interstitial pores; 25 percent cobbles, 50 percent pebbles; sodium fluoride pH is 10.0 after 2 minutes; medium acid (pH 6.0); clear wavy boundary. (4 to 10 inches thick)
Bw1--16 to 22 inches; strong brown (7.5YR 4/6) extremely gravelly sandy loam, dark brown (7.5YR 3/4) moist; weak fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine, fine and medium roots; common very fine tubular and many very fine interstitial pores; 20 percent cobbles, 60 percent pebbles; sodium fluoride pH is 10.0 after 2 minutes; medium acid (pH 6.0); gradual wavy boundary.
Bw2--22 to 31 inches; strong brown (7.5YR 4/6) extremely gravelly sandy loam, dark brown (7.5YR 4/4) moist; moderate fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; 10 percent cobbles, 60 percent pebbles; sodium fluoride pH is 9.1 after 2 minutes; medium acid (pH 6.0); gradual wavy boundary. (The combined thickness of the Bw horizon is 14 to 30 inches).
R--31 to 40 inches; fractured basalt; fractures are 3 to 9 inches apart horizontally and vertically. Fractures are 1/8 inch wide and are filled with soil and roots.
TYPE LOCATION: Lassen County, California; about 1 mile N of Westwood, CA; 1.2 miles N of Highway 36 on Forest Service Road 29N08 to an old logging landing; 0.15 miles W on trail; 200 feet S of trail in a grove of large pine trees; 100 feet N and 50 feet E of the W 1/4 corner of section 31, T.29 N., R.9E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature varies from 44 to 46 degrees F. The thickness of the solum and depth to bedrock is 20 to 40 inches. The soil moisture control section (9 to 27 inches) is dry from August 1 to November 1 (90 days) and is moist in some or all parts the rest of the time. The soil temperature exceeds 41 degrees F from May 1 to December 1 and exceeds 47 degrees F from June 1 to November 1. Rock fragments on the surface range from 0 to 10 percent stones, 1 to 10 percent cobbles and 15 to 30 percent gravel. Most pedons have a clay increase from the A to B horizon but it is insufficient to meet the requirements of an argillic horizon. The 15 bar water content of the fine earth fraction ranges from 8 to 20 percent. Acid-oxalate-extractable aluminum plus one half acid-oxlate-extractable iron ranges from 3.0 to 1.1 throughout.
The A horizon is 10YR 3/3, 4/2; 7.5YR 4/2; 5YR 4/3 or 4/4. Moist colors are 7.5YR 3/2; 5YR 3/2, 3/3 or 3/4. It is stony sandy loam or very gravelly sandy loam with 30 to 50 percent rock fragments and 5 to 12 percent clay. Reaction is neutral or slightly acid. Sodium fluoride pH is 10 to 11. Bulk density ranges from 0.7 to 0.85 g/ccl.
The Bw horizon is 7.5YR 4/4, 4/6, 5/4, 5/6; 5YR 4/4, 4/6, 5/4 or 5/6. Moist colors are 7.5YR 3/4, 4/4, 4/6; 5YR 3/4, 4/4 or 4/6. It is very or extremely gravelly sandy loam or very or extremely cobbly sandy loam with 50 to 75 percent rock fragments and 8 to 15 percent clay. Reaction is slightly or medium acid. Sodium fluoride pH is 9.0 to 10.0. Bulk density of the fine earth fraction ranges from 0.86 to 0.98 g/cc.
Andic property data (see remarks for explanation):
Depth P-ret B.D. pHNaf Glass Alo Feo 15barH2o
0-6 96 0.76 10.5 4.2 2.1 0.8 17.3
6-16 93 0.80 10.0 3.8 1.4 0.7 16.4
16-22 88 0.86 10.0 2.2 0.9 0.7 16.4
22-31 85 0.98 9.1 2.2 0.7 0.7 16.8
COMPETING SERIES: These are the Belzar, Bertolotti, Cliffdell(T), Hartill, Highhorn, Huntrock, Illabot, Inkler, Kloochman, McCree, Merkel Newbell, Ohscow, Oxerine, Scotties(T), Talls, Threemile, Wilma(T) and Wilmont series. Belzar soils have 20 to 30 percent clay in the control section and have calcareous substrata. Bertolotti, Cliffdell, Inkler, Merkel, Ohscow, Newbell, Talls, Threemile and Wilmont soils are very deep. Hartill soils have a paralithic contact at 30 to 40 inches and fine earth fraction textures of loam or silt loam. Highhorn and Scotties soils are deep. Huntrock soils are 27 to 35 percent clay in the control section. Illabot soils have a paralithic contact at 20 to 40 inches and are dry 45 to 60 consecutive days. Kloochman soils are dry 60 to 75 consecutive days. McCree soils are deep and are dry 60 to 75 consecutive days. Oxerine soils are dry 60 to 75 consecutive days and have more than 60 percent vitric material in the surface 14 inches. Wilma soils are dry 60 to 75 consecutive days and have 2C or 2BC horizons with hue of 10YR or 2.5Y.
GEOGRAPHIC SETTING: Redriver soils are on sideslopes of lava flows. Slopes are 0 to 9 percent. These soils formed in residuum from basalt capped with a mantle of volcanic ash. Elevation is 4,530 to 5,400 feet. The climate is subhumid mesothermal with warm dry summers and cold moist winters. The mean annual precipitation is about 30 to 40 inches with 60 to 100 inches of snow. The mean annual temperature is about 44 degrees F, mean July temperature is about 60 degrees F and mean January teperature is about 26 degrees F. The frost-free season is 60 to 80 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Almanor (T), Baileycreek (T), Weste (T) and Woodwest (T) soils. Almanor soils are medial-skeletal. Baileycreek and Weste soils have argillic horizons. Woodwest soils are 12 to 20 inches to bedrock.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; runoff is very slow to medium; moderately rapid permeability.
USE AND VEGETATION: Redriver soils are used for timber produduction. The vegetation is Jeffrey pine, white fir, sugar pine, incense-cedar, squawcarpet, whitethorn and greenleaf manzanita.
DISTRIBUTION AND EXTENT: Northeastern Plumas County and Western Lassen County, near Westwood and Chester, California. The soils of this series are moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES PROPOSED: Lassen County, California, Susanville Area Soil Survey Area 1988.
REMARKS: Andic subgroup based on UCD lab data of 2 similar pedons.
Diagnostic horizons and features recognized in this pedon:
Ochric epipedon: The zone from the surface to a depth of 16 inches. (A, AB horizons).
Cambic horizon: The zone from about 16 to 31 inches. (Bw1 and Bw2 horizons).
Andic material: The zone from the mineral soil surface to a depth of 31 inches (A1,AB, Bw1, Bw2 horizons).
Andic property data definitions:
P-ret: phosphate retention of the less than 2mm fraction.
B.D.: bulk density of the less than 2mm fraction measured at 33kPa water retention.
pH NaF: pH of soil mixed with saturated sodium floride solution.
Glass: percent volcanic glass.
Alo: acid-oxalate-extractable aluminum of the less than 2mm fraction.
Feo: acid-oxalate-extractable iron of the less than 2mm fraction.
15 bar H20: dried 1500 kPa water retention as a percent.
Data elements with a * are estimated.
NC: not calculated.
ND: not done.