LOCATION SAGLE IDEstablished Series
TAXONOMIC CLASS: Ashy over loamy-skeletal, glassy over isotic, frigid Aquic Vitrixerands
TYPICAL PEDON: Sagle ashy silt loam - on a 7 percent north facing slope in a forested area. When described the soil was wet above 42 inches and saturated below. (Colors are for moist soil unless otherwise stated.)
Oi--0 to 1 inch; slightly decomposed needles, leaves, and twigs.
Oa--1 to 2 inches ; highly decomposed organic matter.
A--2 to 13 inches; dark yellowish brown (10YR 3/4) ashy silt loam, yellowish brown (10YR 5/4) dry; weak fine and medium subangular blocky structure; soft, very friable, slightly plastic; common very fine, fine, medium, and coarse roots; common very fine and fine tubular and interstitial pores; neutral (pH 6.8); clear wavy boundary. (2 to 11 inches thick)
Bt--13 to 17 inches; dark yellowish brown (10YR 4/4) ashy silt loam, light yellowish brown (10YR 6/4) dry; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine and medium roots; common very fine and fine tubular and interstitial pores; few thin clay films on faces of peds; 5 percent pebbles; moderately acid (pH 6.0); clear wavy boundary. (4 to 13 inches thick)
Bw--17 to 23 inches; yellowish brown (10YR 5/4) gravelly ashy silt loam, very pale brown (10YR 7/4) dry; common fine faint yellowish brown (10YR 5/6) mottles; moderate medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots; common very fine and few fine tubular and interstitial pores; 15 percent pebbles; moderately acid (pH 5.6); abrupt wavy boundary. (5 to 11 inches thick)
2Btg1--23 to 28 inches; mixed light yellowish brown (10YR 6/4) and light brownish gray (2.5Y 6/2) very gravelly sandy loam, mixed very pale brown (10YR 7/3) and light gray (2.5Y 7/2) dry; many fine and medium, faint and distinct yellowish brown (10YR 5/6) and yellowish brown (10YR 5/8) mottles; weak coarse subangular blocky structure; hard, firm, slightly sticky and slightly plastic; few very fine and fine roots; common very fine and fine and few medium tubular and interstitial pores; few thin clay films as bridges; common very fine manganese accumulations; 40 percent pebbles and 5 percent cobbles; strongly acid (pH 5.5); clear wavy boundary. (4 to 14 inches thick)
2Btg2--28 to 62 inches; mixed light yellowish brown (10YR 6/4) light brownish gray (2.5Y 6/2) and light gray (5Y 7/1) extremely gravelly sandy loam, mixed very pale brown (10YR 8/3), pale yellow (2.5Y 8/2) and white (5Y 8/1) dry; many fine and medium distinct and prominent strong brown (7.5YR 5/6) and yellowish brown (10YR 5/6) mottles; massive; very hard, very firm, slightly sticky and slightly plastic; few very fine matted roots; common very fine and fine tubular and interstitial pores; common moderately thick clay films as bridges; common very fine manganese accumulations; 40 percent pebbles, 15 percent cobbles, and 10 percent stones; strongly acid (pH 5.5).
TYPE LOCATION: Bonner County, Idaho; about 1.5 miles along Cocolalla
Loop Road entering at the south end of the lake; 1,525 feet south and 910 feet west of the northeast corner of sec. 13, T.55 N., R.3 W.
RANGE IN CHARACTERISTICS:
Depth to water table
February through June - 24 to 40 inches
June through January - greater than 40 inches
Moisture control section
dry - July to September 45 to 60 days
moist - October to June
Average annual soil temperature - 44 degrees to 47 degrees F
Average summer soil temperature - 52 degrees to 54 degrees F
Bulk density - 0.85 g/cc at depths of 14 inches and below
A horizon
Reaction - slightly acid to neutral
Bt horizon
Color hue - 7.5YR or 10YR
Color value, moist - 3 or 4
Value, dry - 5 or 6
Chroma, moist or dry - 3 or 4
Coarse fragments - 0 to 10 percent
Reaction - moderately acid to slightly acid
Bw horizon
Color value, moist - 4 or 5
Value, dry - 6 or 7
Chroma, moist or dry - 3 or 4
Coarse fragments - 15 to 45 percent
Texture - gravelly ashy silt loam, or below
14 inches very gravelly ashy silt loam
Reaction - moderately acid to slightly acid
2Btg horizon
Color hue - 10YR, 2.5Y, or 5Y
Color value, moist - 4 through 7
Value, dry - 6 through 8
Mottles - value of 4 through 6 moist
Rock fragments - 35 to 70 percent
Reaction - strongly acid to moderately acid
COMPETING SERIES: This is the Swinomish series. The Swinomish soils do not have an argillic horizon and are 25 to 40 inches deep to a densic contact with dense glacial till.
GEOGRAPHIC SETTING: Sagle soils are on uplands that have a plane or concave surface. They occur in bowl-like areas below steeper mountains from which they receive excess runoff and seepage. Elevations range from 2,200 to 3,000 feet. The slope range is 5 to 30 percent. The soils formed in glacial till with a mantle of volcanic ash. Average annual air temperature ranges from 43 to 46 degrees F; average annual precipitation ranges from 28 to 35 inches. The frost-free season is about 90 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ardtoo, Bonner, Colburn, Dufort, Hoodoo, Pend Oreille, Treble, and Vay soils. Ardtoo and Vay soils are well drained and have bedrock at depths of 40 to 60 inches. Bonner and Dufort soils are well drained. Pend Oreille soils are well drained and have less than 35 percent coarse fragments above 40 inches. Treble soils are well drained and lack a volcanic ash mantle. Hoodoo soils are poorly drained.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; medium to rapid runoff; moderate permeability in the solum and moderate to moderately rapid in the substratum.
USE AND VEGETATION: These soils are used for timber production, wildlife habitat, grazing, and recreation. A few areas are used for hay and pasture. Natural vegetation is mainly grand fir, Douglas-fir, western larch, and lodgepole pine with an understory of northern twinflower, princes pine, starry false-Solomons seal, goldthread, common snowberry, rose, pachystima, brackenfern, and piper anemone.
DISTRIBUTION AND EXTENT: Northern Idaho. The soils of this series are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Bonner County, Idaho, 1981.
REMARKS: Diagnostic horizons and feature recognized in this pedon are:
Ochric epipedon, the zone from the soil surface to 13 inches; (Oi, Oa, and A horizons)
Cambic horizon, the zone from 13 to 21 inches; (Bt, and Bw horizons)
Argillic horizon, the zone from 21 to 62 inches; (Btg horizon)
The zone from 2 to 21 inches is more than 30 percent volcanic glass. (A, Bt, and Bw horizons)
This draft reflects a change in classification from Medial over loamy-skeletal, mixed, frigid Dystric Xerochrepts to Ashy over loamy-skeletal, glassy over isotic, frigid Aquic Vitrixerands.