LOCATION LACY ID+WA

Established Series
Rev. CJW/RWL/RJS
10/2016

LACY SERIES

The Lacy series consists of shallow, well drained soils on escarpments, canyonsides, and ridges on plateaus, basalt plains and mountain slopes. They formed in material weathered from basalt bedrock and colluvium with a thin mantle of loess. Moderately slow permeability. Slopes are 0 to 90 percent. The average annual precipitation is about 25 inches and the average annual air temperature is about 48 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Lithic Ultic Argixerolls

TYPICAL PEDON: Lacy stony loam, forested, on a 13 percent southeast facing slope at 2,550 feet elevation. Described on August 2, 1963 the soil was dry to 15 inches and slightly moist below. (Colors are for dry soil unless otherwise stated.)

0i--0 to 1 inch; needles, grass and leaves.

A1--1 to 2 inch; brown (10YR 4/3) loam, very dark brown (7.5YR 2/2) moist; weak thin platy structure; soft, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine irregular pores; 5 percent gravel and stones; about 1 percent stones on the surface; moderately acid (pH 6.0); abrupt smooth boundary.

A2--2 to 5 inches; brown (7.5YR 4/4) stony loam, very dark brown (7.5YR 2/2) moist; moderate thin platy structure; soft, friable, slightly sticky and slightly plastic; many very fine and fine roots; common fine irregular pores; 15 percent gravel and stones; slightly acid (pH 6.2); abrupt smooth boundary.

A3--5 to 8 inches; brown (7.5YR 4/3) stony loam, dark brown (7.5YR 3/2) moist; weak medium platy structure parting to weak fine granular; slightly hard, friable, moderately sticky and moderately plastic; common fine and medium roots; common fine and medium pores; 25 percent gravel and stones; moderately acid (pH 5.8); clear smooth boundary. (A horizons 2 to 12 inches thick)

Bt1--8 to 15 inches; brown (7.5YR 4/3) stony clay loam, dark reddish brown (5YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common fine, medium, and few coarse roots; common fine tubular pores; faint continuous clay films on rock fragments and lining pores; 30 percent gravel and stones; slightly acid (pH 6.4); clear smooth boundary. (4 to 8 inches thick)

Bt2--15 to 19 inches; brown (7.5YR 4/4) extremely stony clay loam, dark reddish brown (5YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common medium and coarse roots between rock fragments; common fine tubular pores; faint continuous clay films on rock fragments and lining pores; 60 percent gravel and stones; strongly acid (pH 5.4); clear irregular boundary. (2 to 8 inches thick)

R--19 inches; hard, fractured basalt bedrock.

TYPE LOCATION: Kootenai County, Idaho; approximately 3.5 miles northwest of Worley, Idaho, about 460 feet north and 300 feet west of the southeast corner of Section 33, T. 48 N., R. 5 W. Latitude - 47 degrees, 21 minutes, 15.6 seconds North; Longitude - 116 degrees, 58 minutes, 56.3 seconds West; NAD 83; Worley ID, USGS quadrangle.

RANGE IN CHARACTERISTICS:
Soil moisture - Usually dry for 45 to 75 consecutive days, moist in the fall through early summer, dry mid-July through mid-September. Xeric moisture regime.
Average annual soil temperature - 47 to 54 degrees F.
Average summer soil temperature - 62 to 66 degrees F. with an O horizon. Mesic temperature regime.
Mollic epipedon thickness - 7 to 18 inches
Oe horizons present in some pedons and mixed with 1980 Mt. St. Helens volcanic ash; 0.5 to 1 inch thick
Depth to bedrock - 10 to 20 inches
Base saturation - 50 to 75 percent
Surface stones - 0 to 3 percent

A horizon
Hue - 10YR or 7.5YR
Value - 3 to 5 dry, 2 to 3 moist
Chroma - 2 to 4 dry, 2 or 3 moist
Texture - loam or silt loam
Clay content - 10 to 23 percent
Rock fragment content - 5 to 45 percent
Reaction - moderately acid to neutral

AB horizon (present in some pedons)
Texture - loam or silt loam
Clay content - 22 to 26 percent
Rock fragments - 15 to 45 percent gravel, 0 to 50 percent cobbles, 0 to 15 percent stones, 15 to 75 percent total

Bt horizon
Hue - 10YR to 5YR
Value - 3 to 5 dry, 2.5 to 4 moist
Chroma - 3 or 4 dry, 2 to 4 moist
Texture - silt loam, loam, clay loam or silty clay loam
Clay content - 18 to 36 percent
Rock fragments - 30 to 90 percent, horizon averages greater than 35 percent
Reaction - strongly acid to neutral

BC horizon (present in some pedons)
Hue - 10YR or 7.5YR
Value - 3 to 5 dry, 3 or 4 moist
Chroma - 3 to 6, dry or moist
Texture - loam or clay loam
Clay content - 20 to 30 percent
Rock fragment content - 0 to 15 percent gravel, 30 to 75 percent cobbles, 0 to 40 percent stones, 65 to 85 percent total
Reaction - slightly acid or neutral

COMPETING SERIES: These are the Ragpie, Reilloc, Riggins, Shinn and Wahoo series. Ragpie soils have lime accumulation at the contact between the argillic horizon and the lithic contact and have average annual precipitation of 14 to 16 inches. Reilloc and Shinn soils are dry 75 to 90 consecutive days in the soil moisture control section. In addition Shinn soils are very shallow. Riggins soils have average annual precipitation of 16 to 22 inches and have an argillic horizon dominated by gravel and less than 15 percent cobbles and stones. Wahoo soils are dry for more than 90 consecutive days in the soil moisture control section.

GEOGRAPHIC SETTING: Lacy soils are on escarpments, canyonsides, and ridges on plateaus, basalt plains and mountain slopes. These soils formed in material weathered from basalt, with a thin mantle of loess. Slopes are 0 to 90 percent. Elevations are 1,100 to 3,300 feet. The climate is warm, subhumid with warm, dry summers and cool, moist winters. The average annual precipitation is 18 to 32 inches. The average annual air temperature is 45 to 52 degrees F. The frost-free season is 90 to 180 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Agatha, Blinn, Bobbitt, and Dorb soils. These soils have bedrock at depths greater than 20 inches. Agatha and Blinn soils are on east and west-facing slopes. Bobbitt soils are on south-facing slopes. Dorb soils are on north-facing slopes.

DRAINAGE AND PERMEABILITY: Well drained; runoff is rapid to very rapid; permeability is moderately slow.

USE AND VEGETATION: These soils are used for timber production, wildlife habitat, recreation, and limited livestock grazing. Potential natural vegetation is mainly ponderosa pine, Idaho fescue, bluebunch wheatgrass, prairie june grass, and western yarrow.

DISTRIBUTION AND EXTENT: Northern Idaho and eastern Washington. This soil is moderately extensive. MLRA 9, 43A

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana

SERIES ESTABLISHED: Benewah County, Idaho, 1975.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from 1 to 15 inches (A1, A2, A3, and Bt1 horizons).
Argillic horizon - The zone from 8 to 19 inches (Bt1 and Bt2 horizons).
Lithic contact - The boundary at 19 inches (R horizon).
Particle-size control section - The zone from 8 to 19 inches (Bt1 and Bt2 horizons).

National Cooperative Soil Survey
U.S.A.