Detailed Soil Map Units
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49—Stirfry-Grousehill complex, 0 to 10 percent slopes
Map Unit Setting
General location: Bogs and seeps
Major land resource area (MLRA): 3
Elevation: 4,800 to 5,500 feet
Average annual precipitation: 50 to 70 inches
Average annual air temperature: 38 to 42 degrees F
Frost-free period: 0 to 50 days
Map Unit Composition
Stirfry and similar soils:
40 percent
Grousehill and similar soils: 40 percent
Minor components: 20 percent
Characteristics of the Stirfry and Similar Soils
Setting
Landform: Drainageway
Geomorphic position: Bogs and seeps in mountain basins and drainageways
Parent material: Mossy organic material over ash, pumice, and andesite fragments
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
Depth to mineral soil: 20 to 40 inches
Drainage class: Very poorly drained
Permeability: Moderately rapid or rapid
Flooding: Not present
Water table: Present (see
table 20)
Ponding: Not present
Available water capacity: About 9 inches
Interpretive groups
Ecological site: Rangeland—(003XY018OR) Woodland Fen 40-60 PZ
Typical profile
Oe—0 to 2 inches; peat
Oa1—2 to 12 inches; mucky peat
Oa2—12 to 26 inches; mucky peat
2C1—26 to 30 inches; mucky ashy sandy loam
2C2—30 to 60 inches; very gravelly mucky ashy loamy coarse sand
Characteristics of the Grousehill and Similar Soils
Setting
Landform: Moraine
Geomorphic position: Glacial moraines in valleys
Parent material: Ash over glacial till
Properties and qualities
Slope: 0 to 10 percent
Percentage of surface covered with stones and boulders: 3 percent
Restrictive feature: Duripan at a depth of 20 to 40 inches
Drainage class: Moderately well drained
Permeability: Moderate
Flooding: Not present
Water table: Present (see
table 20)
Ponding: Not present
Available water capacity: About 12.8 inches
Interpretive groups
Ecological site: Forestland—(003XY709OR) Pseudotsuga menziesii/Vaccinium membranaceum/Chimaphila umbellata
Typical profile
Oi—0 to 3 inches; slightly decomposed plant material
A—3 to 10 inches; gravelly medial loam
Bw1—10 to 31 inches; very cobbly medial loam
Bw2—31 to 39 inches; very cobbly medial loam
Bqm—39 to 56 inches; cemented very cobbly medial sandy loam
Characteristics of the Minor Components
Stirfry soils
Percentage of map unit: 10 percent
Landform: Drainageway
Geomorphic position: Mossy organic material to a depth of 40 to 60 inches in bogs and seeps
Mariel soils
Percentage of map unit: 5 percent
Landform: Drainageway
Geomorphic position: Sphagnum moss and organic material in seeps and bogs
Umak soils
Percentage of map unit: 5 percent
Landform: Ashflow
Geomorphic position: Pumice and ash deposits in valleys
Major Soil Features and Properties Affecting Management
Stirfry soil
• Wetness
• Organic soil material over mineral soil material
• Frost hazard
Grousehill soil
• Rock fragments on surface
• Rock fragments in soil profile
• Depth to hardpan
Crater Lake National Park, Oregon 69
