13 4. 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

6. Unionpeak-Castlecrest (mountain hemlock)

Percentage of park: 7 percent

Location in park: Along the northern, eastern, and southern flanks of the caldera rim

Drainage class: Somewhat excessively drained

Slope range: 0 to 35 percent

Elevation: 5,000 to 7,000 feet

Average annual precipitation: 50 to 70 inches

Average annual air temperature: 38 to 42 degrees F

Frost-free period: 0 to 50 days

Minor components: 10 percent Sunnotch soils and 5 percent Rock outcrop

Present vegetation: Mountain hemlock and lodgepole pine

Unionpeak soils

Depth class: Moderately deep to a duripan

Permeability: Rapid throughout the solum and moderately rapid in the weakly cemented duripan

Position on landscape: Ashflows

Parent material: Pumice, ash, andesite, and dacite

Surface texture: Ashy sandy loam

Subsoil texture: Gravelly ashy loamy sand

Castlecrest soils

Depth class: Very deep

Permeability: Rapid

Position on landscape: Mountain flanks and mountainsides

Parent material: Pumice and ash

Surface and subsoil texture: Paragravelly ashy loamy sand

Substratum texture: Ashy coarse sand and ashy sand

<< previousnext >>