41—Maklak paragravelly ashy loamy sand, 0 to 10 percent slopes
Map Unit Setting
General location: Valleys and lava plains in the northeastern part of the park
Major land resource area (MLRA): 6
Elevation: 4,500 to 6,000 feet
Average annual precipitation: 30 to 60 inches
Average annual air temperature: 38 to 42 degrees F
Frost-free period: 10 to 50 days
Map Unit Composition
Maklak and similar soils: 85 percent
Minor components: 15 percent
Characteristics of the Maklak and Similar Soils
Setting
Landform: Ashflow
Geomorphic position: Pumice flows and ashflows in valleys and on lava plains
Parent material: Pumice and ash
Properties and qualities
Slope: 0 to 10 percent
Percentage of surface covered with stones and boulders: None
Restrictive features: None within a depth of 60 inches
Drainage class: Excessively drained
Permeability: Very rapid
Flooding: Not present
Water table: Not present
Ponding: Not present
Available water capacity: About 6.2 inches
Interpretive groups
Ecological site: Forestland—(006XY701OR) Pinus ponderosa/Arctostaphylos patula/Carex inops
Typical profile
Oi—0 to 1 inch; slightly decomposed plant material
A—1 inch to 4 inches; paragravelly ashy loamy sand
Bw—4 to 15 inches; very paragravelly ashy loamy sand
C1—15 to 25 inches; extremely paracobbly ashy loamy sand
C2—25 to 60 inches; extremely paragravelly ashy loamy sand
Characteristics of the Minor Components
Lapine soils
Percentage of map unit: 10 percent
Landform: Ashfall
Geomorphic position: Pumice and ash in valleys and on lava plains
Steiger soils
Percentage of map unit: 5 percent
Landform: Ashfall
Geomorphic position: Ash and pumice in valleys and on lava plains
Major Soil Features and Properties Affecting Management
Maklak soil
• High pumice content
• Paracobbles throughout the profile
• Very rapid permeability
