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 285<br />
Slope: 8 to 35 percent<br />
Elevation: 6,000 to 7,500 feet<br />
Effective annual precipitation: 20 to 25 inches<br />
Frost-free period: 50 to 70 days<br />
Surface layer texture: Loam<br />
Drainage class: Well drained<br />
Parent material: Loamy alluvium or colluvium<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 8.4 inches<br />
Arrowpeak and similar soils<br />
Composition: 25 percent<br />
Geomorphic description:<br />
• Mountaintop summit on mountain<br />
• Mountaintop shoulder on mountain<br />
Slope: 15 to 35 percent<br />
Elevation: 6,000 to 7,500 feet<br />
Effective annual precipitation: 20 to 25 inches<br />
Frost-free period: 50 to 70 days<br />
Surface layer texture: Very channery loam<br />
Depth to bedrock (lithic): 10 to 20 inches<br />
Drainage class: Well drained<br />
Parent material: Residuum weathered from gabbro<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 1.3 inches<br />
Adel and similar soils<br />
Composition: 20 percent<br />
Geomorphic description: Mountain and swale<br />
Slope: 8 to 15 percent<br />
Elevation: 6,000 to 7,500 feet<br />
Effective annual precipitation: 20 to 25 inches<br />
Frost-free period: 50 to 70 days<br />
Surface layer texture: Loam<br />
Drainage class: Well drained<br />
Parent material: Loamy alluvium or colluvium<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 10.2 inches<br />
Additional Components<br />
Lymanson and similar soils: 4 percent<br />
Pintlar and similar soils: 4 percent<br />
Whitore and similar soils: 4 percent<br />
Adel 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 />
386D—Millerlake loam, 4 to 15 percent<br />
slopes<br />
Setting<br />
Elevation: 6,000 to 7,500 feet<br />
Mean annual precipitation: 20 to 25 inches<br />
Frost-free period: 50 to 70 days<br />
Major Component Description<br />
Millerlake and similar soils<br />
Composition: 85 percent<br />
Geomorphic description: Fan<br />
Slope: 4 to 15 percent<br />
Elevation: 6,000 to 7,500 feet<br />
Effective annual precipitation: 20 to 25 inches<br />
Frost-free period: 50 to 70 days<br />
Surface layer texture: Loam<br />
Drainage class: Well drained<br />
Parent material: Loamy alluvium or colluvium<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 8.4 inches<br />
Additional Components<br />
Adel and similar soils: 5 percent<br />
Bridger and similar soils: 5 percent<br />
Monaberg and similar soils: 5 percent<br />
Management<br />
For management information about this map unit,<br />
see appropriate sections in Part II <strong>of</strong> this publication.<br />
387E—Tongue River-Novary-Cowood<br />
complex, 4 to 45 percent slopes<br />
Setting<br />
Elevation: 5,500 to 7,500 feet<br />
Mean annual precipitation: 20 to 25 inches<br />
Frost-free period: 50 to 70 days<br />
Major Component Description<br />
Tongue River and similar soils<br />
Composition: 50 percent<br />
Geomorphic description:<br />
• Mountainflank backslope on mountain<br />
• Mountainflank footslope on mountain<br />
Slope: 15 to 45 percent
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