31 18—Collier ashy loamy sand, dry, 0 to 10 percent slopes

18—Collier ashy loamy sand, dry, 0 to 10 percent slopes

 Map Unit Setting

 General location: Ashflows in valleys

Major land resource area (MLRA): 6

Elevation: 4,000 to 6,000 feet

Average annual precipitation: 20 to 40 inches

Average annual air temperature: 41 to 44 degrees F

Frost-free period: 0 to 50 days

 Map Unit Composition

 Collier and similar soils: 85 percent

Minor components: 15 percent

 Characteristics of the Collier and Similar Soils

 Setting

 Landform: Ashflow

Geomorphic position: Ashflows in valleys

Parent material: Ash and cinders

 Properties and qualities

 Slope: 0 to 10 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 7.1 inches

 Interpretive groups

 Ecological site: Forestland—(006XY701OR) Pinus ponderosa/Arctostaphylos patula/Carex inops

 Typical profile

 Oi—0 to 1 inch; slightly decomposed plant material

A—1 inch to 5 inches; ashy loamy sand

BA—5 to 12 inches; ashy loamy sand

Bw—12 to 23 inches; paragravelly ashy loamy sand

C—23 to 62 inches; paragravelly ashy sand

 Characteristics of the Minor Components

 Steiger soils

 Percentage of map unit: 10 percent

Landform: Ashflow

Geomorphic position: Ashflows in valleys

 Maklak soils

 Percentage of map unit: 5 percent

Landform: Ashflow

Geomorphic position: Pumice flows and ashflows in valleys

 Major Soil Features and Properties Affecting Management

 Collier soil

 • Sandy textures

• Low soil strength

• Dustiness if vegetation is removed

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