18 Soils on Alpine Meadows With Intermingled Forests

Soil Survey of Crater Lake National Park, Oregon 

General Soil Map Units

Soils on Alpine Meadows With Intermingled Forests

Number of map units: 1

Percentage of park: 15 percent

11. Cleetwood-Llaorock-Dyarock

Percentage of park: 15 percent

Location in park: Alpine and subalpine meadows throughout park

Depth class: Very deep

Permeability: Rapid

Elevation: 5,700 to 8,000 feet

Average annual precipitation: 40 to 80 inches

Average annual air temperature: 38 to 42 degrees F

Frost-free period: 0 to 50 days

Minor components: 5 percent Castlecrest soils, 3 percent Rock outcrop, and 2 percent Timbercrater soils

Present vegetation: Cleetwood—mountain buckwheat, western needlegrass, Shasta buckwheat, Newberry knotweed, mountain heath, and Hall’s sedge; Llaorock—mountain hemlock, whitebark pine, and Shasta red fir; Dyarock—Brewer’s sedge, bottlebrush squirreltail, Parry rush, and western needlegrass

Cleetwood soils

Drainage class: Excessively drained

Position on landscape: Mountainsides and benches and valleys on mountains in the Pumice Desert

Parent material: Ash, and andesite and pumice fragments

Surface texture: Very gravelly ashy loamy coarse sand

Substratum texture: Ashy sand and ashy coarse sand

Llaorock soils

Drainage class: Somewhat excessively drained

Position on landscape: Ridges and backslopes of mountains

Parent material: Residuum and colluvium derived from andesite mixed with ash

Surface texture: Gravelly ashy sandy loam

Subsoil texture: Extremely stony medial sandy loam

Dyarock soils

Drainage class: Moderately well drained

Position on landscape: Swales and drainageways on mountains

Parent material: Ash, pumice, cinders, and andesite fragments

Surface texture: Very gravelly ashy loamy sand

Subsoil texture: Ashy loamy sand

Substratum texture: Gravelly ashy loamy coarse sand

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