LOCATION FAN LAKE WATentative Series
TAXONOMIC CLASS: Fine-loamy, isotic, frigid Andic Haploxeralfs
TYPICAL PEDON: Fan Lake ashy very fine sandy loam, cropped; on a 2 percent slope at an elevation of 2,270 feet. (When described on September 23, 2002 the soil was dry to 57 inches and moist from 57 to 60 inches. Colors are for dry soil unless otherwise noted. All textures are apparent field textures.)
Ap--0 to 4 inches; brown (10YR 5/3) ashy very fine sandy loam, dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; weakly smeary; many fine and medium, and few coarse roots; common fine irregular pores; neutral (pH 7.0); clear smooth boundary. (3 to 8 inches thick)
AB--4 to 8 inches; pale brown (10YR 6/3) ashy very fine sandy loam, brown (10YR 4/3) moist; moderate thin platy structure; soft, friable, nonsticky and nonplastic; weakly smeary; common fine, and few medium and coarse roots; common very fine irregular pores; neutral (pH 7.0); clear smooth boundary. (4 to 6 inches thick)
Bw--8 to 16 inches; light yellowish brown (10YR 6/4) ashy fine sandy loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; common fine, and few medium and coarse roots; common fine irregular pores; slightly acid (pH 6.2); clear smooth boundary. (5 to 14 inches thick)
2E--16 to 24 inches; pale yellow (2.5Y 7/3) fine sandy loam, light olive brown (2.5Y 5/3) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; common fine roots; many fine irregular pores; 1 percent gravel; slightly acid (pH 6.5); gradual wavy boundary. (1 to 9 inches thick)
2E/Bt--24 to 36 inches; 70 percent pale yellow (2.5Y 7/3) loam, light olive brown (2.5Y 5/3) moist (E part); 30 percent light yellowish brown (2.5Y 6/4) loam, olive brown (2.5Y 4/4) moist (Bt part); moderate medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few fine roots; many fine irregular pores; 20 percent distinct clay films on faces of peds; 1 percent gravel; neutral (pH 6.6); gradual wavy boundary. (0 to 18 inches thick)
2Btx--36 to 51 inches; light yellowish brown (2.5Y 6/4) clay loam, olive brown (2.5Y 4/4) moist; strong coarse angular blocky structure; hard, firm, moderately sticky and moderately plastic; few fine roots ; many fine irregular pores; 30 percent distinct dark yellowish brown (10YR 4/4), moist, clay films on all faces of peds and 1 percent prominent black (10YR 2/1), moist, organic stains; 2 percent distinct yellowish brown (10YR 5/4), moist, masses of oxidized iron; 30 percent fragic properties; 1 percent gravel; neutral (pH 6.6); clear wavy boundary. (7 to 20 inches thick)
3C1--51 to 57 inches; light yellowish brown (2.5Y 6/3) fine sandy loam, olive brown (2.5Y 4/3) moist; massive; soft, very friable, slightly sticky and slightly plastic; common fine irregular pores; 2 percent distinct yellowish brown (10YR 5/4), moist, masses of oxidized iron; slightly acid (pH 6.5); clear wavy boundary.
3C2--57 to 60 inches; light yellowish brown (10YR 6/4) sandy clay loam, dark yellowish brown (10YR 4/4) moist; massive; slightly hard, friable, moderately sticky and moderately plastic; common fine irregular pores; 2 percent prominent dark grayish brown (2.5Y 4/2), moist, iron depletions and 2 percent faint yellowish brown (10YR 5/4), moist, masses of oxidized iron; slightly acid (pH 6.5). (Combined thickness of 3C horizon is 9 to 23 inches)
TYPE LOCATION: Spokane, Washington; About 5 miles northwest of Deer Park, WA; About 1,200 feet east and 200 feet south of the NW corner of section 9, T. 29 N., R. 42 E., WM.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 44 to 46 degrees F.
Moisture control section - dry 45 to 60 days after the summer solstice, July to September, moist October through June
Depth to argillic horizon - 20 to 40 inches
Depth to fragic properties 20 to 40 inches
Depth to redox concentrations 20 to 40 inches
Volcanic ash mantle with andic soil properties - 7 to 14 inches thick
Estimated properties of the volcanic ash mantle:
Volcanic glass content in the 0.02 to 2 mm fraction - 30 to 60 percent
Acid-oxalate extractable Al plus 1/2 Fe 1.0 to 2.0 percent
Moist bulk density - 0.60 to 1.0 g/cc
15 bar water retention - 5 to 12 percent for air dried samples
Volcanic ash influence with no andic soil properties 5 to 14 inches thick
Estimated properties of the volcanic ash influenced layers:
Volcanic glass content in the 0.02 to 2 mm fraction - 5 to 20 percent
Acid-oxalate extractable Al plus 1/2 Fe 0.4 to 1.0 percent
Moist bulk density 1.15 to 1.35 g/cc
Rock fragment content in the particle-size control section 0 to 5 percent
The A horizon has value of 4 or 5 dry, 2 or 3 moist and chroma of 2 or 3, dry or moist. Reaction is slightly acid or neutral.
The AB horizon has chroma of 3 or 4, dry or moist. Texture is ashy very fine sandy loam, ashy fine sandy loam, or ashy silt loam. Reaction is slightly acid or neutral.
The Bw horizon has value of 6 or 7 dry, 4 or 5 moist and chroma of 3 or 4, dry or moist. Texture is ashy fine sandy loam. Reaction is slightly acid or neutral.
The 2E horizon has hue of 10YR or 2.5Y, value of 6 to 8 dry, 4 to 6 moist, and chroma of 3 or 4 moist. Texture is fine sandy loam, sandy loam, or loam. Reaction is slightly acid or neutral.
The E part of the 2E&Bt horizon has hue of 10YR or 2.5Y, value of 6 or 7 dry, 4 or 5 moist, and chroma of 1 to 3 dry, 2 to 4 moist. Texture is fine sandy loam, sandy loam, or loam. The Bt part has hue of 10YR or 2.5Y, value of 3 or 4 dry. Texture is loam. Reaction is slightly acid or neutral.
A 2Bt/E horizon is present in some pedons.
The 2Btx horizon has hue of 10YR or 2.5Y, value of 6 or 7 dry, 4 or 5 moist and chroma of 3 or 4, dry or moist. Texture is loam, clay loam, or silty clay loam. Reaction is moderately acid to neutral.
The 3C horizon has hue of 10YR or 2.5Y, value of 6 or 7 dry, 4 or 5 moist and chroma of 3 or 4, dry or moist. Textures are stratified and include sand, loamy fine sand, fine sandy loam, very fine sandy loam, silt loam, sandy clay loam, or silty clay loam. Reaction is moderately acid to neutral.
COMPETING SERIES: These are the Fugawee, Henneway, and Neva series. Fugawee soils are 20 to 40 inches to a paralithic contact. Henneway soils are 40 to 60 inches to a lithic contact. Neva soils lack fragic properties and redox concentrations or depletions, are dry for 45 to 75 consecutive days, and are considered well drained. Similar soils with mixed mineralogy are the Tahand and Witcher series. Tahand and Witcher soils are 40 to 60 inches to a paralithic contact and are dry for 75 to 90 consecutive days.
GEOGRAPHIC SETTING: Fan Lake soils are on terraces at elevations of 2,000 to 2,400 feet. Slopes range from 0 to 25 percent, but predominant are 0 to 8 percent. These soils formed in glaciofluvial deposits or Latah formation with a thin mantle of volcanic ash and loess. Fan Lake soils are in a continental climate having warm, dry summers and cool, moist winters. The mean annual temperature is 42 to 45 degrees F. The mean annual precipitation is 20 to 30 inches. The frost-free season is 90 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bridgeson, Eloika, and Wolfeson soils. Bridgeson soils are fine-loamy and are in drainageways. Eloika soils are ashy over loamy and are on glacial outwash terraces. Wolfeson soils are coarse-loamy and are on relict glacial lake terraces.
DRAINAGE AND PERMEABILITY: Moderately well drained; moderately slow permeability. A perched water table is at its uppermost limit from January through February.
USE AND VEGETATION: These soils are used primarily for the production of alfalfa, small grains, grasses, or seed crops. Some areas are used for grazing, woodland, and wildlife habitat. The potential natural vegetation is grand fir, Douglas-fir, lodgepole pine, ponderosa pine, and western larch with an understory of oceanspray, common snowberry, mallow ninebark, oregon grape, longtube twinflower, meadow rue, and pinegrass.
DISTRIBUTION AND EXTENT: Northeastern Washington. MLRA 44. Series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Spokane County, Washington, 2003. Series is named for nearby Fan Lake.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon the zone from 0 to 4 inches (A horizon)
Cambic horizon the zone from 4 to 24 inches (AB, Bw, and 2E horizons)
Albic horizon the zone from 16 to 24 inches (E horizon)
Andic feature - the zone from 0 to 8 inches (A and AB horizons)
Vitrandic feature the zone from 8 to 16 inches (Bw horizon)
Fragic properties the zone from 36 to 51 inches (2Btx horizon)
Argillic horizon the zone from 24 to 51 inches (2E/Bt and 2Btx horizons)
Particle-size control section the zone from 24 to 44 inches (2E/Bt and part of the 2Btx horizon)