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 Over Glacial Deposits
Number of map units: 2
Percentage of park: 10 percent
10. Redcone-Cinder land
Percentage of park: 3 percent
Location in park: Cinder cones throughout park
Slope range: 30 to 60 percent
Elevation: 5,500 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 Rock outcrop and 5 percent Timbercrater soils
Redcone soils
Depth class: Moderately deep to a duripan
Drainage class: Somewhat excessively drained
Permeability: Rapid over moderate
Position on landscape: Cinder cones
Parent material: Cinders and ash
Surface texture: Very gravelly ashy sandy loam
Subsoil texture: Very gravelly ashy coarse sandy loam
Cinder land
Kind of rock: Andesite and basaltic andesite cinders
