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 271<br />
Frost-free period: 50 to 70 days<br />
Surface layer texture: Loam<br />
Drainage class: Well drained<br />
Parent material: Loamy alluvium<br />
Native plant cover type: Forestland<br />
Available water capacity: Mainly 9.3 inches<br />
Additional Components<br />
Danaher 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 />
361E—Cowood very channery loam,<br />
4 to 25 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 />
Cowood and similar soils<br />
Composition: 85 percent<br />
Geomorphic description:<br />
• Mountaintop summit on mountain<br />
• Mountaintop shoulder on mountain<br />
Slope: 4 to 25 percent<br />
Elevation: 5,500 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<br />
sandstone over gabbro<br />
Native plant cover type: Forestland<br />
Available water capacity: Mainly 1.6 inches<br />
Additional Components<br />
Arrowpeak and similar soils: 5 percent<br />
Timberlin and similar soils: 5 percent<br />
Worock 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 />
362F—Wayden-Castner-Rock outcrop<br />
complex, 25 to 60 percent slopes<br />
Setting<br />
Field investigation intensity: Order 2<br />
Elevation: 2,620 to 6,000 feet<br />
Mean annual precipitation: 15 to 19 inches<br />
Frost-free period: 85 to 115 days<br />
Major Component Description<br />
Wayden and similar soils<br />
Composition: 40 percent<br />
Geomorphic description:<br />
• Side slope shoulder on escarpment<br />
• Nose slope summit on escarpment<br />
• Nose slope shoulder on escarpment<br />
Slope: 25 to 60 percent<br />
Elevation: 2,620 to 4,590 feet<br />
Effective annual precipitation: 15 to 19 inches<br />
Frost-free period: 85 to 115 days<br />
Surface layer texture: Clay<br />
Depth to bedrock (paralithic): 10 to 20 inches<br />
Drainage class: Well drained<br />
Parent material: Clayey residuum weathered from<br />
shale and siltstone<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 2.7 inches<br />
Castner and similar soils<br />
Composition: 30 percent<br />
Geomorphic description:<br />
• Nose slope summit on escarpment<br />
• Nose slope shoulder on escarpment<br />
Slope: 25 to 60 percent<br />
Elevation: 4,200 to 6,000 feet<br />
Effective annual precipitation: 15 to 19 inches<br />
Frost-free period: 85 to 115 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<br />
sandstone<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 1.3 inches<br />
Rock outcrop<br />
Composition: 20 percent<br />
Definition: Rock outcrop consists mainly <strong>of</strong> areas <strong>of</strong><br />
exposed hard bedrock.<br />
Geomorphic description: Escarpment