12 Soils That Are in Valleys and Formed in Ash and Pumice Flow Deposits of Ash, Pumice, and Cinders

Soil Survey of Crater Lake National Park, Oregon 

General Soil Map Units

Soils That Are in Valleys and Formed in Ash and Pumice Flow Deposits of Ash, Pumice, and Cinders

Number of map units: 4

Percentage of park: 42 percent

5. Castlecrest-Umak (mountain hemlock with lodgepole pine)

Percentage of park: 25 percent

Location in park: Lowlands and valleys near the northern, western, and southern boundaries

Crater Lake National Park, Oregon 19

Depth class: Very deep

Elevation: 4,500 to 7,500 feet

Average annual precipitation: 50 to 70 inches

Average annual air temperature: 38 to 42 degrees F

Frost-free period: 0 to 50 days

Minor components: 5 percent Timbercrater soils, 5 percent Unionpeak soils, 5 percent Sunnotch soils, and 5 percent Llaorock soils

Present vegetation: Mountain hemlock and lodgepole pine

Castlecrest soils

Drainage class: Somewhat excessively drained

Permeability: Rapid

Position on landscape: Mountain flanks and mountainsides

Parent material: Ash and pumice

Surface and subsoil texture: Paragravelly ashy loamy sand

Substratum texture: Ashy coarse sand and ashy sand

Slope range: 0 to 80 percent

Umak soils

Drainage class: Excessively drained

Permeability: Very rapid

Position on landscape: Pumice flows

Parent material: Pumice and ash

Surface texture: Paragravelly ashy fine sandy loam

Subsoil texture: Extremely paracobbly ashy loamy sand

Slope range: 0 to 10 percent

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