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
