14—Cleetwood, thin surface-Cleetwood-Dyarock complex, 2 to 20 percent slopes
Map Unit Setting
General location: Meadows and deserts on side slopes of 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 30 days
Map Unit Composition
Cleetwood, thin surface, and similar soils: 60 percent
Cleetwood and similar soils: 15 percent
Dyarock and similar soils: 10 percent
Minor components: 15 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, and pumice and andesite fragments
Properties and qualities
Slope: 2 to 20 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 Cleetwood and Similar Soils
Setting
Landform: Ashflow
Geomorphic position: Ashflows on side slopes and benches of Mount Mazama
Parent material: Ash, and pumice and andesite fragments
Properties and qualities
Slope: 2 to 20 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 Dyarock and Similar Soils
Setting
Landform: Ashflow
Geomorphic position: Swales on side slopes of Mount Mazama
Parent material: Ash, pumice, cinders, and andesite fragments
Properties and qualities
Slope: 2 to 20 percent
Percentage of surface covered with stones and boulders: 4 percent
Restrictive features: None within a depth of 60 inches
Drainage class: Moderately well drained
Permeability: Rapid
Flooding: Not present
Water table: Present (see table 20)
Ponding: Not present
Available water capacity: About 8.3 inches
Interpretive groups
Ecological site: Rangeland—(003XY013OR) Ashy
Alpine Swale 50-70 PZ
Typical profile
A1—0 to 1 inch; very gravelly ashy loamy sand
A2—1 inch to 7 inches; ashy sandy loam
AB—7 to 17 inches; ashy sandy loam
Bw—17 to 30 inches; ashy loamy sand
C1—30 to 44 inches; gravelly ashy loamy coarse sand
C2—44 to 62 inches; ashy coarse sand
Characteristics of the Minor Components
Sunnotch soils
Percentage of map unit: 10 percent
Landform: Debris flow
Geomorphic position: Forested debris flows on side slopes of Mount Mazama
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)
Cleetwood soil
• Wind erosion
• Dustiness
• Low soil strength
Dyarock soil
• Wetness in spring
• Dustiness
• Sandy textures
• Low soil strength
• Desert pavement (high amount of rock fragments on surface)
