Soil Survey of Crater Lake National Park, Oregon
Detailed Soil Map Units
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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
