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
9. Grousehill
Percentage of park: 6 percent
Location in park: Uplands along the western boundary
Slope range: 0 to 35 percent
Elevation: 4,500 to 7,000 feet
Average annual precipitation: 45 to 70 inches
Average annual air temperature: 38 to 42 degrees F
Frost-free period: 10 to 35 days
Minor components: 10 percent Llaorock soils and 5 percent Timbercrater soils
Present vegetation: Mountain hemlock, Shasta red fir, Douglas fir, and lodgepole pine
Grousehill soils
Depth class: Moderately deep to a duripan
Drainage class: Moderately well drained
Permeability: Moderate
Position on landscape: Ridges and benches
Parent material: Ash over glacial till
Surface texture: Gravelly medial loam
Subsoil texture: Very cobbly medial loam
