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ADVANCED COPY SUBJECT TO CHANGE <br />• <br />• <br />988-Jannsen-Jarvie clay loams, 6 <br />to 12 percent slopes <br />Map Unit Setting <br />Major Land Resource Area: 48A <br />Elevation: 6,500 to 8,000 feet (1,981 to 2,438 <br />meters) <br />Mean annual precipitation: 14 to 20 inches (356 <br />to 508 millimeters) <br />Effective annual precipitation: greater than 24 <br />inches (610 millimeters) <br />Mean annual air temperature: 43 to 45 degrees <br />F. (6.1 to 7.2 degrees C.) <br />Frost-free period: 80 to 115 days <br />Map Unit Composition <br />Jannsen and similar soils: 45 percent <br />Jarvie and similar soils: 35 percent <br />Minor components: <br />Component Descriptions <br />Jannsen soils <br />Landform: Toeslope of hills, alluvial fans, valley <br />floors <br />Parent material. Silty and clayey alluvium <br />derived from calcareous shale <br />Slope: 6 to 12 percent <br />Surface fragments: None <br />Depth to restrictive feature: Greater than 60 <br />inches <br />Drainage class: Somewhat poorly drained <br />Slowest permeability:.06 to 0.2 in/hr (slow) <br />Available water capacity: About 10.9 inches <br />(high) <br />Shrink-swell potential. About 4.5 percent <br />(moderate) <br />Flooding hazard: None <br />Ponding hazard: None <br />Seasonal high water table depth: About 12 to 36 <br />inches <br />Runoff class: High <br />Calcium carbonate maximum: About 25 percent <br />Gypsum maximum: About 1 percent <br />Salinity maximum: About 8 mmhos/cm (slightly <br />saline) <br />Sodium adsorption ratio maximum: About 2 <br />(slightly sodic) <br />Ecological site: Unspecified <br />Potential native vegetation: Unspecified <br />Land capability subclass (irrigated): 4w <br />Land capability subclass (nonirrigated): 4w <br />C-32 to 61 inches; silty clay loam <br />Jarvle soils <br />Landform: Toeslope of hills, alluvial fans, valley <br />floors <br />Parent material: Silty and clayey alluvium <br />derived from calcareous shale <br />Slope: 6 to 12 percent <br />Surface fragments: None <br />Depth to restrictive feature: Greater than 60 <br />inches <br />Drainage class: Poorly drained <br />Slowest permeability..001 to 0.2 in/hr (very <br />slow) <br />Available water capacity: About 10.9 inches <br />(high) <br />Shrink-swell potential. About 5.1 percent <br />(moderate) <br />Flooding hazard. None <br />Ponding hazard. None <br />Seasonal high water table depth: About 0 to 12 <br />inches <br />Runoff class: High <br />Calcium carbonate maximum: About 25 percent <br />Gypsum maximum: About 1 percent <br />Salinity maximum: About 16 mmhos/cm <br />(moderately saline) <br />Sodium adsorption ratio maximum: About 4 <br />(slightly sodic) <br />Ecological site: Unspecified <br />Potential native vegetation: Unspecified <br />Land capability subclass (irrigated): 4w <br />Land capability subclass (nonirrigated): 4w <br />Typical Profile: <br />Ap-0 to 5 inches; clay loam <br />Btl-5 to 10 inches; clay loam <br />Bt2-10 to 29 inches; silty clay loam <br />BCt-29 to 36 inches; silty clay loam <br />C-36 to 62 inches; silty clay loam <br />DAD 1/03 <br />Typical Profile: <br />Ap-0 to 4 inches; clay loam <br />Btl-4 to 11 inches; clay loam <br />Bt2-11 to 24 inches; silty clay loam <br />BCt-24 to 32 inches; silty clay loam