07 Lapine-Steiger (ponderosa pine/fir)

Soil Survey of Crater Lake National Park, Oregon 

General Soil Map Units

Soils That Are on Uplands and Formed in Airfall-Deposited Ash and Pumice

Number of map units: 3

Percentage of park: 29 percent

1. Lapine-Steiger (ponderosa pine/fir)

Percentage of park: 7 percent

Location in park: Eastern side, primarily on the eastern flank of Timber Crater

Depth class: Very deep

Position on landscape: Pumice- and ash-mantled lava plains, hills, ridges, and cinder cones

Parent material: Pumice and ash

Elevation: 4,200 to 6,500 feet

Average annual precipitation: 25 to 50 inches

Average annual air temperature: 38 to 42 degrees F

Frost-free period: 10 to 50 days

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

Present vegetation: Ponderosa pine, white fir, and lodgepole pine

Lapine soils

Drainage class: Excessively drained

Permeability: Very rapid

Surface texture: Paragravelly ashy loamy sand

Subsoil texture: Very paragravelly ashy sand

Substratum texture: Extremely paragravelly ashy sand

Slope range: 2 to 70 percent

Steiger soils

Drainage class: Somewhat excessively drained

Permeability: Rapid

Surface texture: Ashy loamy coarse sand

Subsoil texture: Paragravelly ashy loamy coarse sand

Substratum texture: Paragravelly ashy coarse sand

Slope range: 2 to 25 percent

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