LOCATION HAKKER WATentative Series
TAXONOMIC CLASS: Clayey-skeletal, mixed, superactive, frigid Aquultic Argixerolls
TYPICAL PEDON: Hakker clay loam - abandoned pasture on a 20 percent northwest facing slope at an elevation of 2,800 feet. (The soil was moist when described. Colors are for the dry soil unless otherwise noted.)
A1--0 to 5 inches; dark grayish brown (10YR 4/2) clay loam, very dark brown (10YR 2/2) moist; moderate medium granular structure; hard, friable, slightly sticky and slightly plastic; many fine roots; many very fine irregular pores; slightly acid (pH 6.2); clear smooth boundary. (4 to 8 inches thick)
A2--5 to 15 inches; dark grayish brown (10YR 4/2) clay loam,very dark brown (10YR 2/2) moist; moderate medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common fine roots; common fine tubular pores; slightly acid (pH 6.2); gradual smooth boundary. (8 to 13 inches thick)
A3--15 to 25 inches; dark grayish brown (10YR 4/2) clay loam, very dark brown (10YR 2/2) moist; weak coarse subangular blocky structure; very hard, friable, slightly sticky and slightly plastic; few fine roots; few medium tubular pores; 5 percent cobbles; slightly acid (pH 6.2); gradual wavy boundary. (8 to 12 inches thick)
Bt--25 to 44 inches; brown (10YR 5/3) very cobbly clay, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; very hard, firm, sticky and plastic; few faint patchy clay films; few fine roots; few medium tubular pores; 15 percent gravel, 35 percent cobbles, and 5 percent stones; few fine distinct yellowish brown (10YR 5/6) redox concentrations and common medium faint dark grayish brown (10YR 4/2) redox depletions; slightly acid (pH 6.2) abrupt wavy boundary. (18 to 27 inches thick)
2R--44 inches; unweathered basalt.
TYPE LOCATION: Kittitas County, Washington; about 1 1/2 miles east of Virden Junction in the First Creek drainage; 1,330 feet south and 880 feet east of the northwest corner of section 26, T. 20 N., R. 17 E.
RANGE IN CHARACTERISTICS: The mollic epipedon is 20 to 30 inches thick. Depth to bedrock is 40 to 60 inches. The mean annual soil temperature at 20 inches ranges from 44 to 46 degrees F. The soils are usually moist, but are dry in all parts in the moisture control section for 75 to 90 consecutive days during summer and fall. They are continuously saturated with water within 40 inches of the soil surface for 90 days or more during late winter and early spring. Depth to the uppermost limit of the perched water table and aquic conditions is 20 to 30 inches. The particle-size control section has 40 to 50 percent clay in the fine earth fraction and averages 35 to 55 percent gravel, cobbles, and stones.
The A horizon has value of 2 or 3 moist, and chroma of 1 or 2 dry or moist. It has 0 to 10 percent rock fragments.
The Bt horizon has hue of 10YR through 5Y, value of 5 to 7 dry, 3 through 5 moist and chroma of 2 or 3 dry, 3 or 4 moist. It averages 35 to 55 percent rock fragments.
COMPETING SERIES: There are no competing series. The Marcola, Smarts, and Toncana in other families. Marcola soils are mesic. Smarts and Toncana soils are loamy- skeletal.
GEOGRAPHIC SETTING: Hakker soils are in swales and have slopes of 0 to 25 percent. These soils formed in colluvium derived from basalt. Elevation is 2,400 to 5,500 feet. These soils are in a climate with warm, dry summers and cool, moist winters. The mean annual precipitation is 20 to 35 inches. The mean January temperature is about 24 degrees F. and the mean July temperature is about 67 degrees F. The mean annual temperature is 42 to 44 degrees F. The frost-free season is 90 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Loneridge and Jumpe soils. These soils lack a mollic epipedon. In addition, Jumpe soils are loamy- skeletal. These soils are on mountain side slopes and summits.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; very slow to slow runoff; permeability is slow. A perched water table is at its uppermost limit some time during March and April.
USE AND VEGETATION: These soils are used for native range, pasture, recreation, wildlife habitat and watershed. Vegetation is mountain meadow grasses, sedges, buttercup, false-hellebore, and scattered quaking aspen.
DISTRIBUTION AND EXTENT: Mountainous areas of Kittitas County; MLRA 3. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Kittitas County, Washington, 1979.
REMARKS: Diagnostic horizons and features recognized in this pedon include:
Mollic epipedon (pachic feature) the zone from 0 to 44 inches
Argillic horizon the zone from 24 to 44 inches
Particle-size control section the zone from 24 to 44 inches
Ultic feature - base saturation is assumed to be between 60 and 75 percent.
Aquic feature the zone beginning at 25 inches with redox concentrations and depletions
Classification revised 08/05 based on modal pedon with redox depletions (chroma < 2) at a depth of 25 inches. The classification was revised from Pachic Ultic Argixerolls to Aquic Argixerolls.