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
