Detailed Soil Map Units
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1—Anniecreek-Stirfry-Riverwash complex, 0 to 2 percent slopes
Map Unit Setting
General location: Stream terraces
Major land resource area (MLRA): 6
Elevation: 4,100 to 5,500 feet
Average annual precipitation: 25 to 40 inches
Average annual air temperature: 40 to 42 degrees F
Frost-free period: 10 to 50 days
Map Unit Composition
Anniecreek and similar soils:
60 percent
Stirfry and similar soils: 20 percent
Riverwash: 15 percent
Minor components: 5 percent
Characteristics of the Anniecreek and Similar Soils
Setting
Landform: Stream terrace
Geomorphic position: Stream terraces in narrow ravines
Parent material: Pumice and ash
Properties and qualities
Slope: 0 to 2 percent
Percentage of surface covered with stones and boulders: None
Restrictive features: None within a depth of 60 inches
Drainage class: Somewhat poorly drained
Permeability: Rapid
Flooding: Present (see
table 20)
Water table: Present (see
table 20)
Ponding: Not present
Available water capacity: About 7.2 inches
Interpretive groups
Ecological site: Forestland—(006XY706OR) Picea engelmannii/Alnus incana ssp. tenuifolia/Carex
Typical profile
Oi—0 to 4 inches; slightly decomposed plant material
A1—4 to 12 inches; ashy fine sandy loam
2A2—12 to 24 inches; very gravelly ashy sand
3Ab—24 to 32 inches; ashy fine sand
4Bg1—32 to 55 inches; ashy sand
5Bg2—55 to 71 inches; very gravelly ashy coarse sand
Characteristics of the Stirfry and Similar Soils
Setting
Landform: Stream terrace
Geomorphic position: Stream terraces and seeps in ravines
Parent material: Mossy organic material over ash and pumice
Properties and qualities
Slope: 0 to 2 percent
Percentage of surface covered with stones and boulders: None
Restrictive features: None within a depth of 60 inches
Depth to mineral soil: 40 to 60 inches
Drainage class: Very poorly drained
Permeability: Moderately rapid
Flooding: Not present
Water table: Present (see
table 20)
Ponding: Not present
Available water capacity: About 8.5 inches
Interpretive groups
Ecological site: Rangeland—(003XY015OR) Meadow Fen 40-60 PZ
Typical profile
Oi—0 to 2 inches; peat
Oe—2 to 8 inches; mucky peat
Oa1—8 to 18 inches; muck
Oa2—18 to 51 inches; muck
2A—51 to 60 inches; gravelly ashy coarse sand
Characteristics of the Riverwash
Setting
Landform: Stream terrace
Geomorphic position: Narrow flood plain
Parent material: Sandy and gravelly alluvium
Properties and qualities
Slope: 0 to 2 percent
Percentage of surface covered with stones and boulders: None
Restrictive features: None within a depth of 60 inches
Drainage class: Somewhat excessively drained
Flooding: Present (see
table 20)
Water table: Present (see
table 20)
Crater Lake National Park, Oregon 25
Characteristics of the Minor Components
Stirfry taxadjunct
Percentage of map unit: 5 percent
Landform: Stream terrace
Geomorphic position: Seep and spring areas in narrow ravines
Major Soil Features and Properties Affecting Management
Anniecreek soil
• Occasional flooding
• Dustiness if vegetation is removed
• Water erosion
• Frost hazard
• Wetness
Stirfry soil
• Wetness
• Organic soil material throughout profile
• Frost hazard
Riverwash
• Wetness
• Frequent flooding
• Rock fragments
• Water erosion
Restrictive features: None within a depth of 60 inches
Drainage class: Excessively drained
