Soil Survey of Sweet Grass County Area, Montana - Soil Data Mart
Soil Survey of Sweet Grass County Area, Montana - Soil Data Mart
Soil Survey of Sweet Grass County Area, Montana - Soil Data Mart
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<strong>Sweet</strong> <strong>Grass</strong> <strong>County</strong> <strong>Area</strong>, <strong>Montana</strong>—Part I 235<br />
Management<br />
For management information about this map unit,<br />
see appropriate sections in Part II <strong>of</strong> this publication.<br />
256F—Sixbeacon-Reedpoint complex,<br />
15 to 60 percent slopes<br />
Setting<br />
Elevation: 3,750 to 5,200 feet<br />
Mean annual precipitation: 10 to 14 inches<br />
Frost-free period: 95 to 125 days<br />
Major Component Description<br />
Sixbeacon and similar soils<br />
Composition: 60 percent<br />
Geomorphic description: Base slope on escarpment<br />
and fan<br />
Slope: 15 to 60 percent<br />
Elevation: 3,750 to 5,200 feet<br />
Effective annual precipitation: 10 to 14 inches<br />
Frost-free period: 95 to 125 days<br />
Surface layer texture: Gravelly loam<br />
Drainage class: Well drained<br />
Parent material: Gravelly alluvium<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 4.4 inches<br />
Reedpoint and similar soils<br />
Composition: 30 percent<br />
Geomorphic description:<br />
• Nose slope summit on escarpment<br />
• Nose slope shoulder on escarpment<br />
Slope: 15 to 60 percent<br />
Elevation: 3,750 to 5,200 feet<br />
Effective annual precipitation: 10 to 14 inches<br />
Frost-free period: 95 to 125 days<br />
Surface layer texture: Very channery loam<br />
Depth to bedrock (lithic): 4 to 10 inches<br />
Drainage class: Well drained<br />
Parent material: Residuum weathered from<br />
sandstone<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 0.4 inches<br />
Additional Components<br />
Verson and similar soils: 4 percent<br />
Rentsac and similar soils: 3 percent<br />
Yawdim and similar soils: 3 percent<br />
Management<br />
For management information about this map unit,<br />
see appropriate sections in Part II <strong>of</strong> this publication.<br />
257B—Absher-Bigsag families, clays,<br />
0 to 4 percent slopes<br />
Setting<br />
Elevation: 3,750 to 5,200 feet<br />
Mean annual precipitation: 10 to 14 inches<br />
Frost-free period: 95 to 125 days<br />
Major Component Description<br />
Absher and similar soils<br />
Composition: 60 percent<br />
Geomorphic description: Flood plain<br />
Slope: 0 to 4 percent<br />
Elevation: 3,750 to 5,200 feet<br />
Effective annual precipitation: 10 to 14 inches<br />
Frost-free period: 95 to 125 days<br />
Surface layer texture: Clay<br />
Drainage class: Somewhat poorly drained<br />
Parent material: Silty and clayey alluvium<br />
Native plant cover type: Rangeland<br />
Water table: Present<br />
Salt affected: Saline within 30 inches<br />
Sodium affected: Sodic within 30 inches<br />
Available water capacity: Mainly 3.8 inches<br />
Bigsag and similar soils<br />
Composition: 25 percent<br />
Geomorphic description: Flood plain<br />
Slope: 2 to 4 percent<br />
Elevation: 3,750 to 5,200 feet<br />
Effective annual precipitation: 10 to 14 inches<br />
Frost-free period: 95 to 125 days<br />
Surface layer texture: Clay<br />
Drainage class: Very poorly drained<br />
Parent material: Clayey alluvium weathered from<br />
sandstone and shale<br />
Native plant cover type: Rangeland<br />
Water table: Present<br />
Ponding duration: Long<br />
Salt affected: Saline within 30 inches<br />
Available water capacity: Mainly 7.8 inches<br />
Additional Components<br />
Havre and similar soils: 10 percent<br />
Yamacall and similar soils: 5 percent
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