LOCATION SUGARBOWL WA

Established Series
Rev. JDG/EH/RJE/RWL
10/2011

SUGARBOWL SERIES

The Sugarbowl series consists of very deep, well drained soils formed in slope alluvium and colluvium derived from basalt mixed with volcanic ash. Sugarbowl soils are on hills and mountains. Slopes are 5 to 30 percent. The mean annual precipitation is about 50 inches and the mean annual temperature is about 43 degrees F.

TAXONOMIC CLASS: Ashy, amorphic, frigid Humic Vitrixerands

TYPICAL PEDON: Sugarbowl ashy loam - forested on a 15 percent southeast-facing side slope at an elevation of 3,380 feet. (Colors are for dry soil unless otherwise noted. All textures are apparent field textures.)

Oi--0 to 0.5 inches; slighty decomposed needles, leaves, and twigs.

Oe--0.5 to 1 inch; moderately decomposed needles, leaves and twigs.

A1--1 to 5 inches; brown (7.5YR 4/2) ashy loam, very dark brown (7.5YR 2/2) moist; weak very fine granular structure; soft, friable, slightly sticky, nonplastic and weakly smeary; many very fine and common fine and medium roots; many very fine irregular pores; 10 percent fine gravel; slightly acid (pH 6.2); clear smooth boundary. (3 to 6 inches thick)

A2--5 to 16 inches; brown (7.5YR 5/3) ashy loam, dark brown (7.5YR 3/3) moist; weak fine granular structure; soft, friable, slightly sticky, nonplastic and weakly smeary; many very fine, fine and medium roots; many very fine irregular and tubular pores; 10 percent fine gravel; moderately acid (pH 6.0); clear smooth boundary. (6 to 13 inches thick)

Bw1--16 to 26 inches; brown (7.5YR 5/3) ashy loam, dark brown (7.5YR 3/4) moist; weak very fine subangular blocky structure; soft, friable, slightly sticky, nonplastic and weakly smeary; many fine and very fine roots; many very fine irregular and and common very fine tubular pores; 10 percent gravel; slightly acid (pH 6.1); gradual smooth boundary. (7 to 14 inches thick)

Bw2--26 to 42 inches; brown (7.5YR 5/4) ashy loam, dark brown (7.5YR 3/4) moist; weak very fine and fine subangular blocky structure; soft, friable, slightly sticky, slightly plastic and weakly smeary; common very fine roots; many very fine irregular and common very fine tubular pores; 10 percent gravel; slightly acid (pH 6.4); gradual smooth boundary. (12 to 21 inches thick)

BC--42 to 61 inches; brown (7.5YR 5/4) gravelly ashy loam, dark brown (7.5YR 3/4) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic and weakly smeary; common very fine roots; many very fine irregular and few very fine tubular pores; 25 percent gravel; neutral (pH 6.6).

TYPE LOCATION: Klickitat County, Washington; about 4 miles northeast of Trout Lake; 730 feet north and l00 feet east of the southwest corner of section 7, T. 6 N., R. 10 E. (Latitude 46 degrees, 01 minutes, 03 seconds N. and Longitude 121 degrees, 36 minutes, 30 seconds W.)

RANGE IN CHARACTERISTICS: The mean annual soil temperature is 43 to 47 degrees F. These soils are usually moist but are dry in the moisture control section for 45 to 60 consecutive following solstice. The 0 to 40 inch particle-size control section has an estimated moist bulk density of 0.60 to 0.85 g/cc, volcanic glass content of 5 to 30 percent, acid oxalate extractable aluminum plus one-half iron of 2.0 to 4.0 percent, phosphate retention of 85 to 98 percent, and 15 bar water retention of 8 to 12 percent. Base saturation (NH4OAc) is estimated to be less than 50 percent. Rock fragments in the particle-size control section range from a 0 to 15 percent. Below the particle-size control section rock fragments range from 15 to 35 percent. The umbric epipedon is 10 to 19 inches thick. Reaction is moderately acid to neutral.
The A horizon has hue of 7.5YR or 10YR, value of 4 or 5 dry, 2 or 3 moist and chroma of 2 or 3 dry or moist.
The Bw horizon has hue of 7.5YR or 10YR, value of 5 or 6 dry, 3 or 4 moist and chroma of 4 to 6 dry. Texture is ashy loam ranging to gravelly ashy loam in the lower part.

COMPETING SERIES: These are the Glen (T), Kreft (T), Timberhead, Troutlake, and Volash series.
Glen series - dry for 60 to 75 consectutive days; pscs with 20 to 30 percent volcanic glass and 1.0 to 2.0 percent acid oxalate extractable Al + 1/2 Fe
Kreft series - dry for 60 to 75 consectutive days; pscs with 30 to 60 percent volcanic glass
Timberhead series - pscs with 20 to 35 percent rock fragments; 50 to 85 percent pararock fragments below 40 inches
Troutlake series - mollic epipedon 8 to 16 inches thick; base saturation (NH4Oac) of 60 to 75 percent within upper 30 inches
Volash series - 40 to 60 inches to a lithic contact (basalt)

GEOGRAPHIC SETTING: Sugarbowl soils are on hillslopes and side slopes of mountains at elevations of 2,000 to 3,600 feet. Slopes are 5 to 30 percent. The soils formed in colluvium derived from basalt mixed with volcanic ash. Summers are cool and dry; winters are cold and wet with a snow cover from December through April. The mean annual precipitation is 45 to 55 inches. The mean January temperature is 23 degrees F. and the mean July temperature is 63 degrees F. The mean annual temperature is 41 to 45 degrees F. The frost-free season is 75 to 95 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Kingtain and Firoke soils. These soils are on mountains and are ashy-skeletal.

DRAINAGE AND PERMEABILITY: Well drained; slow to moderate runoff; moderate permeability.

USE AND VEGETATION: These soils are used mainly for timber production, grazable woodland, wildlife habitat, and recreation. Native vegetation is grand fir, Douglas-fir, western hemlock and western larch, with an understory of vine maple, western hazel, Pacific dogwood, common snowberry, prince's pine, elk sedge, deerfoot vanillaleaf, trailing blackberry, and longtube twinflower.

DISTRIBUTION AND EXTENT: Klickitat and Yakima Counties, Washington. MLRA 6. The series is of small extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Klickitat County, Washington, 2003.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Umbric epipedon - the zone from 1 to 16 inches
Cambic horizon - the zone from 16 to 61 inches
Andic properties - the zone from 1 to 61 inches
Particle-size control section - the zone from 1 to 41 inches
Andic properties and mineralogy based on associated Firoke and Kingtain soils
Depth to diagnostic horizons and features are measured from the top of the first mineral layer.
Note: 4/03 - Further investigation needed as to the xeric moisture regime. Plants listed such as western hemlock, vanillaleaf, and twinflower reflect a udic soil moisture regime.

National Cooperative Soil Survey
U.S.A.