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

Soil Survey of Crater Lake National Park, Oregon 

General Soil Map Units

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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