50—Sunnotch gravelly ashy sandy loam, dry, 0 to 35 percent slopes

 Map Unit Setting

 General location: Valleys on the eastern side of the park

Major land resource area (MLRA): 3

Elevation: 5,000 to 6,000 feet

Average annual precipitation: 40 to 60 inches

Average annual air temperature: 38 to 42 degrees F

Frost-free period: 0 to 50 days

 Map Unit Composition

 Sunnotch and similar soils: 80 percent

Minor components: 20 percent

 Characteristics of the Sunnotch and Similar Soils

 Setting

 Landform: Debris flow

Geomorphic position: Mountainsides and valleys

Parent material: Cinders and ash

 Properties and qualities

 Slope: 0 to 35 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 6.6 inches

 Interpretive groups

 Ecological site: Forestland—(003XY704OR) Abies/

Arctostaphylos nevadensis/Carex inops

 Typical profile

 Oi—0 to 1 inch; slightly decomposed plant material

A1—1 inch to 3 inches; gravelly ashy sandy loam

A2—3 to 11 inches; ashy loamy sand

Bw—11 to 25 inches; very gravelly ashy loamy sand

2C—25 to 61 inches; very gravelly ashy sand

 Characteristics of the Minor Components

 Castlecrest soils

 Percentage of map unit: 10 percent

Landform: Stratovolcano

Geomorphic position: Ashflow and ashfall deposits on mountainsides

 Timbercrater soils

 Percentage of map unit: 10 percent

Landform: Stratovolcano

Geomorphic position: Airfall deposits of pumice and ash on mountainsides

 Major Soil Features and Properties Affecting Management

 Sunnotch soil

 • Rock fragments in soil profile

• Sandy textures

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