LOCATION FROSTAD WA
Established Series
IRD EED/MPR
07/2017
FROSTAD SERIES
The Frostad series consists of moderately deep, poorly drained soils formed in glacial drift over dense glacial drift. Frostad soils are in drainageways and valleys of glacial drift plains and have slopes of 0 to 5 percent. The mean annual precipitation is about 830 millimeters and the mean annual temperature is 10 degrees C
TAXONOMIC CLASS: Coarse-loamy, isotic, nonacid, mesic Aeric Epiaquepts
TYPICAL PEDON: Frostad loam, in a nearly level drainageway at 120 meters elevation. When described on August 7th, 2006 the soil was dry throughout. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 2 cm; slightly decomposed plant material; clear wavy boundary. (2 to 5 cm thick)
A--2 to 15 cm; very dark grayish brown (10YR 3/2) loam, dark grayish brown (10YR 4/2) dry; weak medium subangular blocky structure; soft, very friable, nonsticky, nonplastic; many very fine and fine roots and few medium and coarse roots; many very fine and fine irregular pores; 10 percent gravel; moderately acid (pH 5.8); clear wavy boundary. (3 to 25 cm thick)
Bg--15 to 41 cm; brown (10YR 4/3) sandy loam, brown (10YR 5/3) dry; massive; slightly hard, friable, nonsticky, nonplastic; few fine roots in cracks; few very fine irregular pores; many coarse distinct dark yellowish brown (10YR 3/6) iron-manganese masses in cracks and many coarse distinct grayish brown (10YR 5/2) iron depletions in cracks; 10 percent gravel; slightly acid (pH 6.4); gradual wavy boundary. (20 to 41 cm thick)
E--41 to 54 cm; grayish brown (10YR 5/2) gravelly sandy loam, light brownish gray (10YR 6/2) dry; massive; moderately hard, friable, nonsticky, nonplastic; common fine roots in cracks; many fine and medium irregular pores; common coarse distinct dark yellowish brown (10YR 3/6) iron-manganese masses in cracks; 15 percent gravel; moderately acid (pH 5.9); gradual wavy boundary. (10 to 25 cm thick)
2Cd--54 to 152 cm; olive brown (2.5Y 4/3) sandy loam, olive brown (2.5Y 4/4) dry; massive; hard, firm, slightly sticky, slightly plastic; many fine and medium irregular pores; 5 percent gravel; neutral (pH 6.9).
TYPE LOCATION: Island County, Washington - about 245 meters east and 145 meters south of the northwest corner of section 21, T. 33 N, R. 2 E; Willamette Baseline Meridian; USGS Crescent Harbor, WA quadrangle; latitude 48 degrees, 20 minutes, 19 seconds N. and longitude 122 degrees, 34 minutes, 8 seconds W. NAD83
RANGE IN CHARACTERISTICS: Depths to diagnostic horizons and features start from the mineral soil surface.
Mean annual soil temperature - 10 to 11 degrees C.
Depth to densic contact - 50 to 100 cm
Reaction - moderately acid to neutral
Depth to redoximorphic features - 8 to 23 cm
Particle size control section:
Rock fragments - 0 to 35 percent gravel, 0 to 10 percent cobbles, 0 to 5 percent stones, and 0 to 35 percent total
Clay content - 5 to 18 percent
A horizon
Hue - 10YR or 7.5YR
Value - 2 to 4 moist, 3 to 5 dry
Chroma - 2 or 3 moist and dry
Rock fragments - 0 to 15 percent gravel
Bg horizon
Hue - 10YR or 2.5Y
Value - 3 or 4 moist, 4 to 5 dry
Chroma - 3 or 4 moist and dry
Rock fragments - 0 to 35 percent gravel, 0 to 5 percent cobbles, 0 to 5 percent stones, 0 to 35 percent total
Texture - COSL or SL
E horizon
Hue - 10YR or 2.5Y
Value - 3 or 4 moist, 4 to 5 dry
Chroma - 2 or 3 moist and dry
Rock fragments - 0 to 35 percent gravel, 0 to 10 percent cobbles, 0 to 5 percent stones, 0 to 25 percent total
Texture - COSL or SL
2Cd horizon
Value - 3 or 4 moist, 4 to 5 dry
Chroma - 3 or 4 moist and dry
Rock fragments - 0 to 15 percent gravel
Texture - L or SL
COMPETING SERIES: There are no competing series in this family.
GEOGRAPHIC SETTING: Frostad soils are in drainageways and valleys of glacial drift plains. Slopes range from 0 to 5 percent. These soils formed in glacial drift over dense glacial drift. Elevations are 0 to 150 meters. The climate is characterized by warm dry summers and mild, moist winters. The mean annual precipitation ranges from 450 to 1,000 millimeters. The mean annual air temperature ranges from 9 to 10 degrees C.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Elwha,
Morancreek, and
Zylstra soils. Elwha and Morancreek soils occur on adjacent hillslopes and are 46 to 100 cm to redoximorphic features. Zylstra soils also occur on adjacent hillslopes and are 20 to 41 cm to redoximorphic features.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly drained; Saturated hydraulic conductivity is moderately high in the A horizon, high in the Bg and E horizons, and low in the 2Cd horizon. Frostad soils have a perched water table at or near the soil surface from October to April unless the soil is drained. Frostad soils are subject to frequent ponding for very long durations from December to March and for brief durations during October, November, and April.
USE AND VEGETATION: These soils are used mainly for timber production, watershed, and wildlife habitat. Potential natural vegetation consists of Sitka spruce, red alder, salmonberry, trailing blackberry, red elderberry, common snowberry, stinging nettle, swordfern, slough sedge, field horsetail, and scouring-rush horsetail.
DISTRIBUTION AND EXTENT: Northwestern Washington; MLRA 2, North. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Island County, Washington, 2008.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon
Albic horizon - the zone from 41 to 54 cm (E horizon)
Densic Contact - 54 cm (upper boundary of the Cd horizons)
Particle size control section - the zone from 25 to 54 cm (to the Cd horizon)
Depth to redoximorphic features - 15 cm (Bg horizon)
National Cooperative Soil Survey
U.S.A.