Detailed Soil Map Units
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31—Lapine-Steiger-Wuksi complex, high elevation, 2 to 25 percent slopes
Map Unit Setting
General location: Eastern side of Timber Crater
Major land resource area (MLRA): 6
Elevation: 4,500 to 6,000 feet
Average annual precipitation: 25 to 50 inches
Average annual air temperature: 38 to 42 degrees F
Frost-free period: 10 to 50 days
Map Unit Composition
Lapine and similar soils:
35 percent
Steiger and similar soils: 30 percent
Wuksi and similar soils: 30 percent
Minor components: 5 percent
Characteristics of the Lapine and Similar Soils
Setting
Landform: Ashfall
Geomorphic position: Mountainsides
Parent material: Ash and pumice
Properties and qualities
Slope: 2 to 25 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/Ceanothus velutinus/Carex inops
Typical profile
Oi—0 to 2 inches; slightly decomposed plant material
A—2 to 8 inches; paragravelly ashy loamy sand
Bw1—8 to 15 inches; paragravelly ashy loamy sand
Bw2—15 to 24 inches; very paragravelly ashy sand
C—24 to 60 inches; extremely paragravelly ashy sand
Characteristics of the Steiger and Similar Soils
Setting
Landform: Stratovolcano
Geomorphic position: Mountainsides
Parent material: Ash and pumice
Properties and qualities
Slope: 2 to 25 percent
Percentage of surface covered with stones and boulders: None
Restrictive features: None within a depth of 60 inches
Drainage class: Somewhat excessively drained
Permeability: Rapid
Flooding: Not present
Water table: Not present
Ponding: Not present
Available water capacity: About 6 inches
Interpretive groups
Ecological site: Forestland—(006XY701OR) Pinus ponderosa/Ceanothus velutinus/Carex inops
Typical profile
A—0 to 4 inches; ashy loamy coarse sand
Bw1—4 to 10 inches; paragravelly ashy loamy coarse sand
Bw2—10 to 19 inches; paragravelly ashy loamy coarse sand
BC—19 to 29 inches; paragravelly ashy coarse sand
C1—29 to 35 inches; paragravelly ashy coarse sand
C2—35 to 60 inches; paragravelly ashy coarse sand
Characteristics of the Wuksi and Similar Soils
Setting
Landform: Stratovolcano
Geomorphic position: Mountainsides
Parent material: Ash mixed with colluvium derived from andesite
Properties and qualities
Slope: 2 to 25 percent
Percentage of surface covered with stones and boulders: 10 percent
Restrictive features: None within a depth of 60 inches
Drainage class: Somewhat excessively drained
Permeability: Rapid
Flooding: Not present
Water table: Not present
Ponding: Not present
Available water capacity: About 7.2 inches
Interpretive groups
Ecological site: Forestland—(006XY701OR) Pinus ponderosa/Ceanothus velutinus/Carex inops
Typical profile
Oi—0 to 1 inch; slightly decomposed plant material
A—1 inch to 5 inches; cobbly ashy loamy sand
AB—5 to 14 inches; very cobbly ashy loamy coarse sand
Bw1—14 to 29 inches; very cobbly ashy sand
Bw2—29 to 37 inches; very cobbly ashy sandy loam
Bw3—37 to 60 inches; extremely cobbly ashy sandy loam
Characteristics of the Minor Components
Rock outcrop
Percentage of map unit: 5 percent
Landform: Lava flow
Geomorphic position: Mountainsides
Major Soil Features and Properties Affecting Management
Lapine soil
• Low soil strength
• High pumice content
• Very rapid permeability
Steiger soil
• Sandy textures
• Low soil strength
Wuksi soil
• Rock fragments on surface
• Rock fragments in soil profile
