Classification of the Soils
Depth class: Very deep
Drainage class: Somewhat poorly drained
Position on landscape: Stream terraces
Parent material: Pumice and ash
Slope range: 0 to 2 percent
Elevation: 4,100 to 5,500 feet
Average annual precipitation: 25 to 40 inches
Average annual air temperature: 40 to 42 degrees F
Frequency of flooding: Occasional
Frost-free period: 10 to 50 days
Taxonomic class: Ashy, glassy Aquic Vitricryands
Oi—0 to 4 inches; mat of slightly decomposed needles; abrupt wavy boundary.
A1—4 to 12 inches; very dark grayish brown (10YR 3/2) ashy fine sandy loam, dark grayish brown (2.5Y 4/2) dry; weak medium granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots; many very fine irregular pores; about 5 percent pumice paragravel; slightly acid (pH 6.4); clear smooth boundary.
2A2—12 to 24 inches; very dark gray (10YR 3/1) very gravelly ashy sand, dark gray (10YR 4/1) dry; single grain; loose, nonsticky and nonplastic; many very fine irregular pores; about 10 percent pumice paragravel and 40 percent gravel; neutral (pH 7.0); abrupt smooth boundary.
3Ab—24 to 32 inches; dark grayish brown (10YR 4/2) and very dark gray (10YR 3/1) stratified ashy fine sand and ashy sand, grayish brown (10YR 5/2) and light brownish gray (10YR 6/2) dry; many fine prominent strong brown (7.5YR 4/6) soft iron masses and many fine prominent black (10YR 2/1) soft manganese masses; massive; soft, very friable, nonsticky and slightly plastic; few very fine roots; few very fine tubular pores; about 1 percent gravel; neutral (pH 6.6); clear smooth boundary.
4Bg1—32 to 55 inches; black (N 2.5/0) ashy sand, dark gray (2.5Y 4/1) dry; massive; soft, very friable, nonsticky and nonplastic; many very fine irregular pores; about 5 percent gravel; moderately acid (pH 5.6); clear smooth boundary.
5Bg2—55 to 71 inches; black (N 2.5/0) very gravelly ashy coarse sand, variegated dry; common coarse distinct strong brown (7.5YR 4/6) soft iron accumulations; single grain; loose, nonsticky and nonplastic; many very fine irregular pores; about 40 percent gravel; neutral (pH 6.8).
Typical Pedon Location
Map unit in which located: Anniecreek-Stirfry-Riverwash complex, 0 to 2 percent slopes
Location in park: Anne Creek stream terraces in the “panhandle” in Klamath County; in the SE1/4NW1/4 of sec. 32, T. 31 S., R. 7 E.; 588852 meters easting and 4743947 meters northing, UTM Zone 10T, NAD 27
Range in Characteristics
Depth to bedrock—more than 60 inches
Time of year water table is at a depth of less than 60 inches—March through June
Depth to redoximorphic features—20 to 35 inches
Thickness of umbric epipedon—15 to 25 inches
Content of clay—0 to 15 percent
Content of rock fragments in upper 40 inches of mineral soil—10 to 35 percent
A and 2A horizons:
Hue—10YR to 2.5Y
Value—2 or 3 moist, 3 to 5 dry
Chroma—1 or 2 moist, 1 to 3 dry
Hue—10YR or 7.5YR
Value—2 to 4 moist, 4 or 5 dry
Chroma—1 to 3 moist or dry
Texture—variable, including medial very fine sandy loam, loamy coarse sand, ashy sand, and ashy fine sand
AC horizon (where present):
Hue—10YR to 2.5Y
Value—2 to 4 moist, 4 to 6 dry
Texture—ashy fine sandy loam, loamy sand, or sand
4B and 5B horizons:
Value—2.5 to 4 moist, 4 or 5 dry
Chroma—0 to 3 moist, 2 to 4 dry
Content of pumice paragravel—0 to 20 percent
Content of rock fragments—0 to 70 percent
Texture—ashy or medial and variable, including sand, loamy sand, and coarse sand