Detailed Soil Map Units
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15—Cleetwood, thin surface-Llaorock-Cleetwood complex, 5 to 30 percent slopes
Map Unit Setting
General location: Deserts, forests, and meadows on Mount Mazama
Major land resource area (MLRA): 3
Elevation: 6,000 to 7,500 feet
Average annual precipitation: 60 to 80 inches
Average annual air temperature: 38 to 42 degrees F
Frost-free period: 0 to 50 days
Map Unit Composition
Cleetwood, thin surface, and similar soils:
40 percent
Llaorock and similar soils: 40 percent
Cleetwood and similar soils: 15 percent
Minor components: 5 percent
Characteristics of the Cleetwood, Thin Surface, and Similar Soils
Setting
Landform: Ashflow
Geomorphic position: Ashflows on side slopes and benches of Mount Mazama
Parent material: Ash, pumice, and andesite fragments
Properties and qualities
Slope: 5 to 30 percent
Percentage of surface covered with stones and boulders: 1 percent
Restrictive features: None within a depth of 60 inches
Drainage class: Excessively drained
Permeability: Rapid
Flooding: Not present
Water table: Not present
Ponding: Not present
Available water capacity: About 6.1 inches
Interpretive groups
Ecological site: Rangeland—(003XY011OR) Ashy Alpine Desert 50-70 PZ
Typical profile
A1—0 to 2 inches; very gravelly ashy loamy coarse sand
A2—2 to 10 inches; ashy loamy sand
C1—10 to 36 inches; ashy sand
C2—36 to 50 inches; ashy coarse sand
C3—50 to 60 inches; gravelly ashy sand
Characteristics of the Llaorock and Similar Soils
Setting
Landform: Stratovolcano
Geomorphic position: Forested side slopes of stratovolcanoes
Parent material: Ash mixed with residuum and colluvium derived from andesite
Properties and qualities
Slope: 5 to 30 percent
Percentage of surface covered with stones and boulders: 3 percent
Restrictive features: None within a depth of 60 inches
Drainage class: Somewhat excessively drained
Permeability: Rapid
Flooding: Not present
Water table: Not present
Ponding: Not present
Available water capacity: About 9 inches
Interpretive groups
Ecological site: Forestland—(003XY706OR) Tsuga mertensiana/Luzula glabrata var. hitchcockii
Typical profile
Oi—0 to 1 inch; slightly decomposed plant material
A—1 inch to 7 inches; gravelly ashy sandy loam
Bw1—7 to 14 inches; very stony ashy sandy loam
Bw2—14 to 24 inches; extremely stony ashy sandy loam
Bw3—24 to 61 inches; extremely stony ashy sandy loam
Characteristics of the Cleetwood and Similar Soils
Setting
Landform: Ashflow
Geomorphic position: Ashflows on side slopes and benches of Mount Mazama
Parent material: Ash, pumice, and andesite fragments
Properties and qualities
Slope: 5 to 30 percent
Percentage of surface covered with stones and boulders: None
Restrictive features: None within a depth of 60 inches
Drainage class: Excessively drained
Permeability: Moderately rapid or rapid
Flooding: Not present
Water table: Not present
Ponding: Not present
Available water capacity: About 6.2 inches
Interpretive groups
Ecological site: Rangeland—(003XY012OR) Ashy Alpine Meadow 50-70 PZ
Typical profile
A1—0 to 4 inches; gravelly ashy sandy loam
A2—4 to 10 inches; ashy loamy sand
C1—10 to 36 inches; ashy sand
C2—36 to 50 inches; ashy coarse sand
C3—50 to 60 inches; gravelly ashy sand
Characteristics of the Minor Components
Castlecrest soils
Percentage of map unit: 5 percent
Landform: Ashflow
Geomorphic position: Forested ashflows on side slopes of Mount Mazama
Major Soil Features and Properties Affecting Management
Cleetwood soil, thin surface
• Wind erosion
• Dustiness
• Sandy textures
• Low soil strength
• Desert pavement (high amount of rock fragments on surface)
Llaorock soil
• Rock fragments on surface
• Rock fragments in soil profile
Cleetwood soil
• Dustiness
• Low soil strength
• Wind erosion
