Detailed Soil Map Units
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16—Cleetwood-Sunnotch-Castlecrest complex, high elevation, 15 to 30 percent slopes
Map Unit Setting
General location: Meadows and whitebark pine forests on Mount Mazama
Major land resource area (MLRA): 3
Elevation: 7,000 to 8,000 feet
Average annual precipitation: 50 to 70 inches
Average annual air temperature: 38 to 42 degrees F
Frost-free period: 0 to 30 days
Map Unit Composition
Cleetwood and similar soils:
50 percent
Sunnotch and similar soils: 20 percent
Castlecrest and similar soils: 15 percent
Minor components: 15 percent
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: 15 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 Sunnotch and Similar Soils
Setting
Landform: Debris flow
Geomorphic position: Forested debris flows on side slopes of Mount Mazama
Parent material: Cinders and ash
Properties and qualities
Slope: 15 to 30 percent
Percentage of surface covered with stones and boulders: None
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 6.6 inches
Interpretive groups
Ecological site: Forestland—(003XY700OR) Pinus albicaulis/Luzula-Carex
Typical profile
Oi—0 to 1 inch; slightly decomposed plant material
A1—1 inch to 3 inches; gravelly ashy sandy loam
A2—3 to 11 inches; ashy loamy sand
Bw—11 to 25 inches; very gravelly ashy loamy sand
2C—25 to 61 inches; very gravelly ashy sand
Characteristics of the Castlecrest and Similar Soils
Setting
Landform: Ashflow
Geomorphic position: Forested ashfall and ashflows on Mount Mazama
Parent material: Ash and pumice
Properties and qualities
Slope: 15 to 30 percent
Percentage of surface covered with stones and boulders: None
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 6.3 inches
Interpretive groups
Ecological site: Forestland—(003XY700OR) Pinus albicaulis/Luzula-Carex
Typical profile
Oi—0 to 1 inch; slightly decomposed plant material
A—1 inch to 3 inches; paragravelly ashy loamy sand
Bw—3 to 19 inches; paragravelly ashy loamy sand
C1—19 to 26 inches; ashy sand
C2—26 to 38 inches; ashy coarse sand
C3—38 to 64 inches; ashy coarse sand
Characteristics of the Minor Components
Rock outcrop
Percentage of map unit: 8 percent
Landform: Lava flow
Geomorphic position: Andesite lava flow outcroppings on side slopes of Mount Mazama
Timbercrater soils
Percentage of map unit: 5 percent
Landform: Ashflow
Geomorphic position: Forested pumice flow and ashflow deposits on side slopes of Mount Mazama
Dyarock soils
Percentage of map unit: 2 percent
Landform: Ashflow
Geomorphic position: Swales on side slopes of Mount Mazama
Major Soil Features and Properties Affecting Management
Cleetwood soil
• Wind erosion
• Dustiness
• Low soil strength
Sunnotch soil
• Rock fragments in soil profile
Castlecrest soil
• Sandy textures
• Low soil strength
• Dustiness if vegetation is removed
