LOCATION LACONNER           WA
Established Series
Rev. MK/RJE/MPR/SBC
07/2007

LACONNER SERIES


The Laconner series consists of moderately deep, moderately well drained soils formed in glacial drift with an admixture of volcanic ash over dense glacial till. These soils are on hillslopes of drift plains. Slopes are 0 to 45 percent. Mean annual precipitation is about 22 inches and the mean annual temperature is about 50 degrees F.

TAXONOMIC CLASS: Sandy-skeletal, isotic, mesic Aquic Haploxerepts

TYPICAL PEDON: Laconner gravelly sandy loam-forested. (Colors are moist soil unless otherwise noted. All textures are apparent field textures).

Oi--0 to 1 inch; needles, leaves and twigs.

A--1 to 3 inches; very dark brown (10YR 2/2) gravelly sandy loam, dark gray (10YR 4/1) dry; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine, fine, medium and coarse roots; 20 percent gravel; NaF pH 9.0; slightly acid (pH 6.2); abrupt smooth boundary. (1 to 3 inches thick)

Bwl--3 to 10 inches; brown (10YR 4/3) extremely gravelly coarse sandy loam, pale brown (10YR 6/3) dry; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine, fine, medium and coarse roots; 60 percent gravel; NaF pH 9.4; moderately acid (pH 6.0); clear wavy boundary. (5 to 10 inches thick)

Bw2--10 to 20 inches; dark yellowish brown (10YR 4/4) extremely gravelly loamy sand, light yellowish brown (10YR 6/4) dry; single grain; loose; few medium and coarse roots; 65 percent gravel; NaF pH 10.0; moderately acid (pH 6.0); clear wavy boundary. (8 to 15 inches thick)

Cl--20 to 33 inches; dark grayish brown (2.5Y 4/2) very gravelly sand, light olive brown (2.5Y 5/4) dry; single grain; loose; few medium and coarse roots; many dark yellowish brown (10YR 4/6)iron-manganese masses in matrix; many light brownish gray (10YR 6/2) iron depletions; 40 percent gravel; NaF pH 10.0; neutral (pH 6.6); clear wavy boundary. (8 to 20 inches thick)

C2--33 to 39 inches; light olive brown (2.5Y 5/4) extremely gravelly loamy sand, light brownish gray (2.5Y 6/2) dry; single grain; loose; few medium and coarse roots; common dark yellowish brown (10YR 4/6)iron-manganese masses in matrix; many light brownish gray (10YR 6/2) iron depletions;65 percent gravel; few dense glacial till fragments; NaF pH 9.4; neutral (pH 6.8); abrupt smooth boundary. (0 to 10 inches thick)

2Cd--39 to 56 inches; grayish brown (2.5Y 5/2) dense glacial till that breaks to very gravelly fine sandy loam; common light gray (10YR 7/2)iron depletions in cracks; many dark yellowish brown (10YR 4/6)iron-manganese masses in matrix; 35 percent gravel; moderately acid (pH 5.6) abrupt smooth boundary. (l0 inches to several feet thick)

3C3--56 to 61 inches; light olive brown (2.5Y 5/4) very gravelly loamy sand, light brownish gray (2.5Y 6/2) dry; massive; soft, very friable; 40 percent gravel; moderately acid (pH 5.6).

TYPE LOCATION: Skagit County, Washington; 2,600 feet west and 300 feet north of southeast corner sec. 35, T. 35 N., R. l E. Willamette Meridian.

RANGE IN CHARACTERISTICS:

Depth to densic contact - 20 to 40 inches
Moisture control section - dry 60 to 90 days following the summer solstice
Mean annual soil temperature - 48 to 52 degrees F.
Depth to redoximorphic features - 20 to 30 inches
Reaction - moderately acid to neutral
Particle-size control section:
Clay content - 0 to 8 percent
Rock fragments - 15 to 65 percent gravel, 0 to 20 percent cobbles, 35 to 65 percent total

A horizon
Hue - 7.5YR or 10YR
Value - 2 or 3 moist, 3 or 4 dry
Chroma - 1 to 3 moist or dry
Clay content -2 to 12 percent
Rock fragments - 15 to 35 percent gravel

Bw horizon
Hue - 5YR to 10YR
Value - 3 or 4 moist, 4 to 6 dry
Chroma - 3 or 4 moist and dry
Texture - SL or COSL in upper part, LS or S in lower part
Clay content - 0 to 8 percent
Rock fragments - 15 to 65 percent gravel, 0 to 20 percent cobbles, 35 to 65 percent total

C horizon
Hue - 10YR or 2.5Y
Value - 3 to 5 dry, 4 to 6 moist
Chroma - 2 to 4 moist and dry
Texture - LS or S
Clay content - 0 to 8 percent
Rock fragments - 15 to 65 percent gravel, 0 to 20 percent cobbles, 35 to 65 percent total

Cd horizon
Hue - 10YR or 2.5Y
Value - 4 or 5 dry and moist
Chroma - 3 or 4 dry and moist
Texture - LS, FSL, or LFS
Clay content - 0 to 6 percent
Rock fragments - 15 to 65 percent gravel, 0 to 20 percent cobbles, 35 to 65 percent total

COMPETING SERIES: There are no competing series in this family.

GEOGRAPHIC SETTING: Laconner soils are on hillslopes of drift plains at elevations of 0 to 600 feet. They formed in mixed glacial drift with an admixture of volcanic ash over a dense glacial till. Slopes are 0 to 45 percent. These soils have a mild marine climate with cool dry summers and cool moist winters. Mean annual precipitation is 20 to 30 inches. Mean January temperature is 36 degrees F., mean July temperature is 64 degrees F., and mean annual temperature is 50 degrees F. The frost-free season is l60 to 210 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bow, Catla, Clallam and Swinomish soils. Bow soils are in a fine family. Catla and Clallam soils have a loamy control section. Swinomish soils have a medial-skeletal control section.

DRAINAGE AND PERMEABILITY: Moderately well drained; rapid permeability above the dense glacial till and very slow in it.

USE AND VEGETATION: Laconner soils are used for pasture and forage crop production, forestry, and urban land. Potential natural vegetation is Douglas-fir, grand fir, western redcedar, western swordfern, salal, and Oregon-grape.

DISTRIBUTION AND EXTENT: Northwestern Washington. This series is of small extent.

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

SERIES ESTABLISHED: Skagit County, Washington, 198l.

REMARKS: Diagnostic horizons and other features

Ochric epipedon - 1 to 3 inches (A horizon)
Cambic horizon - 3 to 10 inches (Bw1 horizon)
Volcanic glass - assumed to be more than 5 percent
Densic contact - 39 inches (top of Cd horizon
Particle-size control section - 10 to 39 inches (Bw and 2Cd horizons)

This revision (3/2005) reflects a change in classification from Vitrandic Xerorthents to Aquic Haploxerepts, based on the results of laboratory data.

ADDITIONAL DATA: National Soil Survey Laboratory pedon number 04N0763


National Cooperative Soil Survey
U.S.A.