29 16—Cleetwood-Sunnotch-Castlecrest complex, high elevation, 15 to 30 percent slopes

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

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