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
4. Maklak-Collier (ponderosa pine/fir with lodgepole pine)
Percentage of park: 5 percent
Location in park: Lowlands and valleys, mainly near the eastern and southeastern boundaries
Depth class: Very deep
Position on landscape: Pumice flows and ashflows
Parent material: Pumice, ash, and cinders
Elevation: 4,000 to 6,000 feet
Average annual precipitation: 20 to 60 inches
Average annual air temperature: 38 to 44 degrees F
Frost-free period: 0 to 50 days
Minor components: 5 percent Lapine soils
Present vegetation: Ponderosa pine, white fir, and lodgepole pine
Maklak soils
Drainage class: Excessively drained
Permeability: Very rapid
Surface texture: Paragravelly ashy loamy sand
Subsoil texture: Very paragravelly ashy loamy sand
Substratum texture: Extremely paragravelly ashy loamy sand
Slope range: 0 to 10 percent
Collier soils
Drainage class: Somewhat excessively drained
Permeability: Rapid
Surface texture: Ashy sandy loam
Subsoil texture: Paragravelly ashy loamy sand
Substratum texture: Paragravelly ashy sand
Slope range: 0 to 80 percent
