LOCATION HARL OR

Established Series
Rev. RJO/DAL/RWL
03/2013

HARL SERIES

The Harl series consists of very deep, well drained soils on side slopes of plateaus, canyons and mountains. Harl soils formed in volcanic ash over colluvium derived from basalt. Slopes are 30 to 90 percent. The mean annual precipitation is about 30 inches and the mean annual temperature is about 43 degrees F.

TAXONOMIC CLASS: Ashy-skeletal over loamy-skeletal, amorphic over isotic, frigid Typic Udivitrands

TYPICAL PEDON: Harl very gravelly ashy silt loam - Woodland, on a 65 percent planar northwest-facing slope at an elevation of 4,600 feet. (Colors are for moist soil unless otherwise noted.)

Oi--0 to 1 inch; slightly decomposed needles and leaves.

A--1 to 3 inches; dark brown (10YR 3/3) very gravelly ashy silt loam, brown (10YR 5/3) dry; weak fine granular structure; soft, very friable, nonsticky and nonplastic; common fine and medium, and many very fine roots; common fine irregular pores; 30 percent gravel, 5 percent cobbles, and 2 percent stones; slightly acid (pH 6.2); clear smooth boundary. (2 to 6 inches thick)

Bw1--3 to 14 inches; brown (10YR 4/3) very gravelly ashy silt loam, light yellowish brown (10YR 6/4) dry; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine, fine, and medium roots; many fine and few medium irregular pores; 30 percent gravel, 10 percent cobbles and 5 percent stones; slightly acid (pH 6.2); gradual smooth boundary.

Bw2--14 to 25 inches; yellowish brown (10YR 5/4) very gravelly ashy fine sandy loam, very pale brown (10YR 8/4) dry; weak very fine granular structure; soft, nonsticky and nonplastic; many very fine and fine, and common medium roots; many fine and few medium irregular pores; 30 percent gravel, 10 percent cobbles, and 5 percent stones; slightly acid (pH 6.5); clear wavy boundary. (Combined thickness of the Bw horizon is 20 to 32 inches)

2EBb--25 to 30 inches; brown (10YR 5/3) extremely gravelly silt loam, pale brown (10YR 6/3) dry; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many fine, common medium, and few coarse roots; many fine and common medium irregular pores; 45 percent gravel, 15 percent cobbles and 5 percent stones; neutral (pH 6.8); gradual smooth boundary. (0 to 12 inches thick)

2Bwb1--30 to 49 inches; brown (10YR 5/3) extremely gravelly loam, pale brown (10YR 6/3) dry; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine and few medium roots; many fine, common medium, and few coarse irregular pores; 45 percent gravel, 15 percent cobbles, and 5 percent stones; neutral (pH 6.8); gradual smooth boundary. (15 to 25 inches thick)

2Bwb2--49 to 62 inches; brown (10YR 5/3) extremely gravelly loam, very pale brown (10YR 7/3) dry; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine and few medium roots; common medium and coarse, and many fine irregular pores; 50 percent gravel, 20 percent cobbles, and 5 percent stones; slightly acid (pH 6.5).

TYPE LOCATION: Wallowa County, Oregon;
960 feet south and 240 feet east of the northwest corner of Section 19, T.3S., R.47E.

Latitude: 45 degrees, 17 minutes, 23 seconds N.
Longitude: 116 degrees, 59 minutes, 46 seconds W.
UTM Coordinates: Zone: 11 Northing: 5015135.5 Easting: 500305.1

RANGE IN CHARACTERISTICS:
Soil Temperature: frigid regime
Mean Annual Soil Temperature: 42 to 45 degrees F
Mean Summer Soil Temperature: 48 to 54 degrees F
Mean Winter Soil Temperature: 32 to 37 degrees F
Soil Moisture: udic regime; dry 30 to 45 days in summer
Particle-size Control Section: mineral soil surface to 40 inches below mineral surface
Upper part (ashy-skeletal): 22 to 34 inches thick
Clay content: 5 to 18 percent
Rock fragment content: 35 to 65 percent
Lower part (loamy-skeletal): 6 to 18 inches thick
Clay content: 10 to 18 percent
Rock fragment content: 50 to 80 percent
Rock fragment shape: subangular

Diagnostic Horizons and Features:
andic soil properties: upper boundary at the mineral surface; 22 to 34 inches thick
Al+1/2Fe (aox): 1.0 to 3.0 percent
bulk density: 0.65 to 1.0 g/cc
P retention: 40 to 90 percent
0.02-2.0 mm fraction: 40 to 60 percent of fine earth
glass content in the 0.02-2.0 mm fraction: 30 to 90 percent
water content at 1500 kPa (air dried): 5 to 12 percent
8Si + 2Fe (aox): 5 to 12 percent
8Si - 2Fe (aox): 4 to 8 percent
ochric epipedon: 2 to 6 inches thick
cambic horizon:
upper: 20 to 32 inches thick
lower: 28 to 40 inches thick
bedrock depth: greater than 60 inches

A horizon
color, moist: hue is 10YR or 7.5YR, value is 3 or 4 and chroma is 2 or 3
color, dry: hue is 10YR or 7.5YR, value is 5 to 7 and chroma is 2 or 3
texture: GRV-ASHY-SIL, GRV-ASHY-FSL
clay content: 5 to 15 percent
rock fragment content: 35 to 60 percent
gravel: 30 to 45 percent
cobbles: 5 to 10 percent
stones: 0 to 5 percent.
base saturation: 50 to 75 percent (sum of bases)

Bw horizon
color, moist: hue of 10YR or 7.5YR, value of 4 or 5 and chroma of 3 or 4
color, dry: hue of 10YR or 7.5YR, value of 6 to 8 and chroma of 3 or 4
texture: GRV-ASHY-SIL, GRV-ASHY-FSL, CBV-ASHY-FSL
clay: 5 to 15 percent
rock fragments: 35 to 65 percent
gravel: 25 to 35 percent
cobbles: 10 to 20 percent
stones: 0 to 10 percent
base saturation: 50 to 75 percent (sum of bases)

2EBb horizon
color, moist: value of 4 or 5 and chroma of 2 or 3
color, dry: value of 5 or 6 and chroma of 2 or 3
texture: GRX-SIL, CBX-L, GRV-SL
clay: 10 to 18 percent
rock fragments: 50 to 80 percent
gravel: 30 to 45 percent
cobbles: 15 to 25 percent
stones: 5 to 15 percent
base saturation: greater than 75 percent (sum of bases)

2Bwb horizon
color, moist: hue of 10YR, 7.5YR, or 5YR, value of 4 or 5 and chroma of 3 or 4
color, dry: hue of 10YR, 7.5YR, or 5YR, value of 5 to 7 and chroma of 3 or 4
texture:CBX-L, CBX-SIL, GRX-L, CBX-SL
clay: 10 to 18 percent
rock fragments: 60 to 80 percent
gravel: 30 to 50 percent
cobbles: 15 to 25 percent
stones: 5 to 15 percent

COMPETING SERIES: These are the Ahrs and Lakefork (T) series.

Ahrs - lower part of the pscs has 3 to 8 percent clay and dominated by rock fragments of metasedimentary origin (argillite and siltite)
Lakefork (T) - rock fragments in pscs are subrounded or rounded; formed in volcanic ash over till from basalt, metasedimentary and metavolcanic rocks mixed with granitic rocks

Similar soils with glassy mineralogy
Dorb - deep (40 to 60 inches) to hard fractured basalt; upper part of the pscs has glassy mineralogy, formed in volcanic ash over colluvium from basalt

GEOGRAPHIC SETTING:
Landform: occur on foot slopes and side slopes of plateaus, canyons and mountains
Slope gradient: 0 to 90 percent
Parent material: volcaniclastic volcanic ash over colluvium
Lithology: Mazama ash over basalt
Elevation: 2,800 to 6,000 feet
Climate: cold, wet winters and cool, moist summers
Mean annual precipitation: 20 to 40 inches, can range to 16 inches on north-facing slopes
Mean annual air temperature: 41 to 44 degrees F
Frost-free period: 70 to 100 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Anatone -- on side slopes of mountains, lack ash mantles with andic properties
Getaway -- on side slopes of mountains, lack ash mantles with andic properties
Limberjim -- on side slopes of mountains, 40 to 60 inches deep to bedrock

DRAINAGE AND PERMEABILITY:
Drainage: Well drained
Permeability: moderately rapid over moderate

USE AND VEGETATION:
Use: timber production, watershed, recreation, livestock grazing, and wildlife habitat
Native vegetation: grand fir, western larch, Douglas fir, longtube twinflower, princes pine, big huckleberry, and rattlesnake plantain
Ecological site: plant associations: ABGR/LIBOL2, ABGR/VAME

DISTRIBUTION AND EXTENT: Northeast Oregon; MLRA 9 - Blue Mountains.

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

SERIES ESTABLISHED: Wallowa County Area, Oregon 1998. The source of the name is Harl Butte.

REMARKS: Diagnostic horizons and other features recognized in this pedon are:

Ochric epipedon - 1 to 3 inches (A horizon)

Cambic horizon - 3 to 25 inches (Bw1 and Bw2 horizons)

Particle-size control section - 1 to 41 inches
Ashy-skeletal part - 1 to 25 inches (A, Bw1, and Bw2 horizons)
Loamy-skeletal part - 25 to 41 inches (2EBb, 2Bwb1)

This update - 12/2003 -- reflects change in family classification from ashy-skeletal, amorphic, frigid to ashy-skeletal over loamy-skeletal, amorphic over isotic, frigid based on the 9th edition of Keys to Soil Taxonomy.

ADDITIONAL DATA: Partial laboratory data is available for this pedon. Reference sample #S92OR-063-005 from Wallowa County, Oregon, NSSL, Lincoln, NE., 1/94.

National Cooperative Soil Survey
U.S.A.