Classification of the Soils
Cleetwood Series
Depth class: Very deep
Drainage class: Excessively drained
Permeability: Rapid
Position on landscape: Mountainsides, benches, and valleys
Parent material: Ash, and andesite and pumice fragments
Slope range: 0 to 30 percent
Elevation: 5,500 to 8,000 feet
Average annual precipitation: 40 to 80 inches
Average annual air temperature: 38 to 42 degrees F
Frost-free period: 0 to 30 days
Taxonomic class: Ashy, glassy, nonacid Vitrandic Cryopsamments
Typical Pedon
A1—0 to 2 inches; very dark brown (10YR 2/2) very gravelly ashy loamy coarse sand, light brownish gray (10YR 6/2) dry; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots; many very fine interstitial pores; 45 percent andesite and cinder gravel, 5 percent andesite and cinder cobbles, and 1 percent andesite stones; moderately acid (pH 6.0); clear wavy boundary.
A2—2 to 10 inches; very dark brown (10YR 2/2) ashy loamy sand, light brownish gray (10YR 6/2) dry; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots and few medium roots; many very fine interstitial pores; 10 percent andesite gravel; slightly acid (pH 6.2); clear wavy boundary.
C1—10 to 36 inches; dark brown (7.5YR 3/2) ashy sand, pinkish gray (7.5YR 6/2) dry; massive; slightly hard, firm, nonsticky and nonplastic; common very fine roots; many very fine interstitial pores; 5 percent andesite gravel; slightly acid (pH 6.2); abrupt wavy boundary.
C2—36 to 50 inches; dark reddish brown (5YR 3/3) ashy coarse sand, light reddish brown (5YR 6/4) dry; single grain; loose, nonsticky and nonplastic; many fine interstitial pores; 5 percent andesite gravel; slightly acid (pH 6.4); abrupt wavy boundary.
C3—50 to 60 inches; very dark grayish brown (10YR 3/2) gravelly ashy sand, light brownish gray (10YR 6/2) dry; single grain; loose, nonsticky and nonplastic; many fine interstitial pores; 15 percent andesite gravel; slightly acid (pH 6.4).
Typical Pedon Location
Map unit in which located: Cleetwood, thin surface-Cleetwood-Dyarock complex, 2 to 20 percent slopes
Location in park: Meadow about one-half mile north of Watchman Lookout and west of the caldera rim; 567553 meters easting and 4755091 meters northing, UTM Zone 10T, NAD 27; lat. 42o56’50.02″ N., long. 122o10’23.07″ W.
Range in Characteristics
Profile:
Depth to bedrock—more than 60 inches
Thickness of solum—4 to 14 inches
Content of pumice—0 to 15 percent
Content of clay—0 to 5 percent
A1 horizon:
Hue—10YR or 7.5YR
Value—2 or 3 moist, 3 to 6 dry
Chroma—2 or 3 moist or dry
Texture—ashy loamy coarse sand, gravelly ashy loamy sand, gravelly ashy sandy loam, very gravelly ashy loamy sand, or very gravelly ashy loamy coarse sand
Content of rock fragments—0 to 55 percent
A2 horizon:
Hue—10YR or 7.5YR
Value—2 or 3 moist, 3 to 6 dry
Chroma—2 or 3 moist or dry
Texture—ashy loamy sand, ashy loamy coarse sand, or ashy sandy loam
Content of rock fragments—0 to 25 percent
C horizon:
Hue—10YR, 7.5YR, 5YR, or 2.5YR
Value—3 or 4 moist, 4 to 6 dry
Chroma—2 to 4 moist or dry
Texture—ashy sand, ashy loamy sand, ashy coarse sand, or ashy loamy coarse sand
Content of rock fragments—0 to 25 percent
Consistence when dry—loose to very firm
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