21 8—Castlecrest-Badland complex, 60 to 100 percent slopes

Soil Survey of Crater Lake National Park, Oregon

Detailed Soil Map Units

 8—Castlecrest-Badland complex, 60 to 100 percent slopes

Map Unit Setting

General location: Ravines in valleys

Major land resource area (MLRA): 3

Elevation: 5,000 to 6,000 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

Castlecrest and similar soils: 50 percent

Badland: 40 percent

Minor components: 10 percent

Characteristics of the Castlecrest and Similar Soils

Setting

Landform: Ashflow

Geomorphic position: Side slopes on eroded ashflows in valleys

Parent material: Ash and pumice

Properties and qualities

Slope: 60 to 80 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—(003XY705OR) Tsuga mertensiana/Arctostaphylos nevadensis/Chimaphila umbellata

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

Badland

Setting

Landform: Ashflow

Geomorphic position: Nonvegetated side slopes of ravines

Parent material: Ash, cinders, pumice, and andesite

Properties and qualities

Slope: 60 to 100 percent

Percentage of surface covered with stones and boulders: None

Restrictive features: None within a depth of 60 inches

Drainage class: Excessively drained

Characteristics of the Minor Components

Rock outcrop

Percentage of map unit: 5 percent

Landform: Lava flow

Geomorphic position: Andesite and welded tuff outcroppings on sides of canyons

Stirfry soils

Percentage of map unit: 5 percent

Landform: Stream terrace

Geomorphic position: Stream terraces and seeps in ravines

Major Features and Properties Affecting Management

Castlecrest soil

• Sandy textures

• Low soil strength

• Dustiness if vegetation is removed

• Water erosion

• Steep and unstable slopes

Badland

• Wind erosion

• Steep and unstable slopes

• Dustiness

• Water erosion

• Low water-holding capacity

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