28 15—Cleetwood, thin surface-Llaorock-Cleetwood complex, 5 to 30 percent slopes

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

<< previousnext >>