26 13—Cleetwood-Castlecrest-Llaorock complex, 5 to 30 percent slopes

13—Cleetwood-Castlecrest-Llaorock complex, 5 to 30 percent slopes

 Map Unit Setting

 General location: Meadows and forests on Mount Mazama

Major land resource area (MLRA): 3

Elevation: 5,500 to 7,200 feet

Average annual precipitation: 50 to 70 inches

Average annual air temperature: 38 to 42 degrees F

Frost-free period: 0 to 50 days

 Map Unit Composition

 Cleetwood and similar soils: 45 percent

Castlecrest and similar soils: 25 percent

Llaorock and similar soils: 20 percent

Minor components: 10 percent

 Characteristics of the Cleetwood and Similar Soils

 Setting

 Landform: Ashflow

Geomorphic position: Side slopes and benches of Mount Mazama

Parent material: Ash, and pumice and andesite deposits

 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: Rapid

Flooding: Not present

Water table: Not present

Ponding: Not present

Available water capacity: About 6.1 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 Castlecrest and Similar Soils

 Setting

 Landform: Ashflow

Geomorphic position: Side slopes of Mount Mazama

Parent material: Ash and pumice

 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: 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—(003XY706OR) Tsuga mertensiana/Luzula glabrata var. hitchcockii

 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 Llaorock and Similar Soils

 Setting

 Landform: Stratovolcano

Geomorphic position: Side slopes of Mount Mazama

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

AB—7 to 14 inches; very stony ashy sandy loam

Bw1—14 to 24 inches; extremely stony medial sandy loam

Bw2—24 to 61 inches; extremely stony medial sandy loam

 Characteristics of the Minor Components

 Cleetwood soils, thin surface

 Percentage of map unit: 5 percent

Landform: Ashflow

Geomorphic position: Side slopes of Mount Mazama; associated with the Ashy Alpine Desert ecological site

 Dyarock soils

 Percentage of map unit: 5 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

 Castlecrest soil

 • Sandy textures

• Low soil strength

• Dustiness if vegetation is removed

 Llaorock soil

 • Rock fragments on surface

• Rock fragments in soil profile

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