16 Soils That Are on Uplands and Formed in Airfall-Deposited Ash and Pumice Over Glacial Deposits

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

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