LOCATION LONGORT WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Vitrandic Haploxerepts
TYPICAL PEDON: Longort gravelly ashy sandy loam, on a southeast facing 42 percent slope at 3,870 feet elevation in a Douglas-fir and ponderosa pine forest. (Colors are for dry soil unless otherwise stated. All textures are apparent field textures.)
Oe--0 to 1 inch; moderately decomposed needles and twigs; abrupt smooth boundary. (1 to 3 inches thick)
A--1 to 6 inches; brown (10YR 4/3) gravelly ashy sandy loam, dark brown (10YR 3/3) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine, and few medium and coarse roots; common very fine and fine pores; 15 percent gravel and 3 percent cobbles; slightly acid (pH 6.3); clear smooth boundary. (4 to 6 inches thick)
Bw--6 to 18 inches; pale brown (10YR 6/3) gravelly ashy sandy loam, brown (10YR 4/3) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and fine, and few medium roots; common very fine and fine pores; 20 percent gravel and 3 percent cobbles; slightly acid (pH 6.3); gradual wavy boundary. (6 to 12 inches thick)
2C--18 to 38 inches; light yellowish brown (2.5Y 6/3) very gravelly sandy loam, light olive brown (2.5Y 5/3) moist; massive; soft, very friable, nonsticky and nonplastic; common very fine and fine, and few medium roots; few fine pores; 35 percent gravel and 5 percent cobbles; slightly acid (pH 6.4); clear wavy boundary. (15 to 22 inches thick)
2Cd1--38 to 48 inches; light yellowish brown (2.5Y 6/3) very gravelly sandy loam, light olive brown (2.5Y 5/4) moist; massive; slightly hard, friable, nonsticky and nonplastic; few very fine roots; few very fine pores; common fine and medium, distinct, irregular shaped dark yellowish brown (10YR 4/6) moist stains; 35 percent gravel and 5 percent cobbles; slightly acid (pH 6.4); gradual wavy boundary. (10 to 17 inches thick)
2Cd2--48 to 61 inches; light yellowish brown (2.5Y 6/4) very cobbly sandy loam, light olive brown (2.5Y 5/4) moist; massive; hard, friable, nonsticky and slightly plastic; few very fine roots; many fine and medium, distinct, irregular shaped dark yellowish brown (10YR 4/6) moist stains; 35 percent gravel and 20 percent cobbles; slightly acid (pH 6.5).
TYPE LOCATION: Okanogan County, Washington; about 5 miles northeast of Mazama, WA., about 300 feet west and 1,500 feet north of the southeast corner of section 4, T. 36 N., R. 20 E. (Latitude 48 degrees, 38 minutes, 50 seconds N., Longitude 120 degrees, 20 minutes, 21 seconds W.)
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 42 to 46 degrees F. Depth to densic materials is 25 to 40 inches. These soils are usually moist but are dry in all parts of the moisture control section for 60 to 75 days following the summer solstice. Thickness of the volcanic ash influence and depth to contrasting glacial till material is 10 to 17 inches, and has an estimated moist bulk density of 1.10 to 1.40 g/cc, volcanic glass content of 5 to 20 percent, acid-oxalate extractable aluminum plus one-half of the acid-oxalate extractable iron of 0.4 to 1.0 percent, and 15-bar water retention of 5 to 10 percent for air dried samples. The particle-size control section averages 35 to 50 percent rock fragments and 8 to 15 percent clay. Reaction ranges from slightly acid to neutral.
The A horizon has value of 4 to 6 dry, 2 or 3 moist and chroma of 2 or 3 dry or moist.
The Bw horizon has value of 5 or 6 dry, 3 or 4 moist, and chroma of 2 or 3 dry or moist. It is gravelly ashy sandy loam or very gravelly ashy sandy loam. It has 15 to 25 percent gravel and 2 to 15 percent cobbles.
The 2C horizon hues of 2.5Y or 10YR, values of 5 or 6 dry, 4 or 5 moist, and chroma of 2 or 3 dry or moist. It is very gravelly sandy loam or very cobbly sandy loam. It has 25 to 35 percent gravel and 10 to 20 percent cobbles.
The 3Cd horizons have hues of 2.5Y or 10YR, values of 5 or 6 dry, 4 or 5 moist, and chromas of 3 or 4 dry, 2 to 4 moist. It is very gravelly sandy loam or very cobbly sandy loam. It has 30 to 45 percent gravel and 10 to 25 percent cobbles.
COMPETING SERIES: These are the Brevco, Coxit, Highhorn, Huntrock, Jimbluff, Jumpe, Lekrem, Ontrail, Radarcreek, Redpeak, Santop, Seeburg and Thout series. Brevco, Redpeak and Thout soils are moderately deep to a lithic contact. Coxit soils lack Cd horizons. Highhorn soils have 27 to 35 percent clay in the particle-size control section and bedrock at a depth of 40 to 60 inches. Huntrock soils have 27 to 35 percent clay and 60 to 80 percent rock fragments in the particle-size control section. Jimbluff soils lack a Cd horizon. Ontrail soils have 5YR and 7.5YR hues and lack Cd horizons. Jumpe, Lekrem and Seeburg soils are very deep. Radarcreek soils are 40 to 60 inches deep to a lithic contact.
GEOGRAPHIC SETTING: Longort soils are on backslopes of mountains, usually on southerly aspects and have slopes of 15 to 65 percent. These soils formed in glacial till and some colluvium from sedimentary rock with a component of volcanic ash in the upper part. Elevations are 2,600 to 4,900 feet. Precipitation ranges from 20 to 24 inches. The average January temperature ranges from 22 to 26 degrees F.; the average July temperature ranges from 62 to 67 degrees F.; and the average annual air temperature ranges from 40 to 44 degrees F. The frost-free season is 90 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Gatewall, Volmont, Thout, and Winsand soils. Gatewall soils are cryic on toeslopes, footslopes and backslopes. Volmont soils are cryic, have bedrock at 20 to 40 inches on backslopes, shoulders and ridges. Thout soils are on shoulders and ridges and have bedrock at 20 to 40 inches. Winsand soils are cryic on southerly aspects, and have bedrock at 40 to 60 inches.
DRAINAGE AND PERMEABILITY: Well drained, rapid runoff; moderate to moderately rapid permeability above the till material and slow through the till material.
USE AND VEGETATION: Used for timber production, wildlife habitat, watershed, recreation and livestock grazing. Native vegetation is Douglas-fir and ponderosa pine with an understory of pinegrass, silky lupine, kinnikinnik, shinyleaf spirea, and luina.
DISTRIBUTION AND EXTENT: Northcentral Washington. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Okanogan National Forest, Okanogan County, Washington, 2005.
REMARKS: Diagnostic horizons and features in this pedon include:
Ochric epipedon
Cambic horizon - 6 to 18 inches
PSCS - zone from 16 to 38 inches (part of the Bw and 2C horizons) averages 35 percent rock fragments.
Vitrandic properties from 1 to 18 inches.