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
