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30 <br />Mean annual ar temperature: 42 to 45 degrees F <br />(5.6 to 7.2 degrees C.) <br />Freeze-free period: 75 to 95 days <br />Map Unit Composition <br />Almy and similar soils: 90 percent <br />Minor components: 10 percent <br />Component Descriptions <br />Almy soils <br />Landform: Alluvial fans, fan terraces <br />Parent material. Loess and alluvium derived from <br />sandstone <br />Slope: 3 to 15 percent <br />Drainage class: Well drained <br />Slowest permeability. 0.2 to 0.6 in./hr. (moderately <br />slow) <br />Available water capacity: About 9.3 inches (high) <br />Shrink-swell potential. About 1.5 percent (low) <br />Punoff class: High <br />Calcium carbonate maximum: About 15 percent <br />Gypsum maximum: None <br />Salinity maximum: About 2 mmhos/cm (nonsaline) <br />Sodium adsorption ratio maximum: About 2 (slightly <br />sodic) <br />Ecological site- Rolling Loam <br />Potential native vegetation: western wheatgrass, <br />Wyoming big sagebrush, prairie Junegrass, <br />Indian ricegrass, bluebunch wheatgrass, <br />needleandthread <br />Land capability subclass (nonirrigated): 4e <br />typical Profile: <br />0 to 6 inches; loam <br />6 to 30 inches; clay loam <br />30 to 60 inches; loam <br />Minor Components <br />Moderately coarse textured soils and similar soils <br />Composition: About 5 percent <br />Spool and similar soils <br />Composition: About 5 percent <br />5-Apmay clay loam, 0 to 1 percent <br />slopes <br />Map Unit Setting <br />Major Land Resource Area: 34 <br />Elevation. 6,000 to 7,000 feet (1,829 to 2,134 meters) <br />Mean annual precipitation: 13 to 16 inches (330 to <br />406 millimeters) <br />Soil Survey <br />Mean annual air temperature: 42 to 45 degrees F. <br />(5.6 to 7.2 degrees C.) <br />Freeze-free period. 75 to 05 days <br />Map Unit Composition <br />Apmay and similar soils: 90 percent <br />Minor components: 10 percent <br />Component Descriptions <br />Apmay soils <br />Landform: Flood plaids <br />Parent material: Alluvium derived from mixed sources <br />Slope: 0 to 1 percent <br />Drainage class: Somewhat poorly drained <br />Slowest- permeability. -0.6 to 2.0 inJhr. (moderate) <br />Available water capacity. About 6.5 inches (moderate) <br />Shrink-swell potential: About 1.5 percent (low) <br />Flooding hazard. Rare <br />Seasonal high water table depth: About 18 to 36 <br />inches <br />Runoff class: Low <br />Calcium carbonate maximum: None <br />Gypsum maximum: None <br />Salinity maximurri: About 0 mmhos/cm (nonsaline) <br />Sodium adsorption ratio maximum: About 0 <br />(nonsodic) <br />Ecological site: River Bottom <br />Potential native vegetation: basin wildrye, western <br />wheatgrass, willow, slender wheatgrass, <br />Nebraska sedge <br />Land capability subclass (irrigated): 4c <br />Land capability subclass (nonirrigated): 4c <br />Typical Profile: <br />0 to 17 inches; clay loam <br />17 to 30 inches; clay loam <br />30 to 60 inches; extremely gravelly sand <br />Minor Components <br />Lander and similar soils <br />Composition: About 5 percent <br />Haplaquolls and similar soils <br />Composition: About 5 percent <br />6-Avalon-Mack complex, 1 to 12 percent <br />slopes <br />Map Unit Setting <br />Major Land Resource Area: 34 <br />Elevation: 5,500 to 6,500 feet (1,676 to 1,981 meters)