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 293<br />
Additional Components<br />
Korchea and similar soils: 4 percent<br />
Breeton and similar soils: 3 percent<br />
Meadowcreek 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 />
401B—Roy cobbly loam, 0 to 4 percent<br />
slopes<br />
Setting<br />
Elevation: 5,300 to 6,200 feet<br />
Mean annual precipitation: 17 to 20 inches<br />
Frost-free period: 70 to 90 days<br />
Major Component Description<br />
Roy and similar soils<br />
Composition: 85 percent<br />
Geomorphic description: Tread on terrace<br />
Slope: 0 to 4 percent<br />
Elevation: 5,300 to 6,200 feet<br />
Effective annual precipitation: 17 to 20 inches<br />
Frost-free period: 70 to 90 days<br />
Surface layer texture: Cobbly loam<br />
Drainage class: Well drained<br />
Parent material: Gravelly glaci<strong>of</strong>luvial deposits<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 4.5 inches<br />
Additional Components<br />
Shawmut and similar soils: 5 percent<br />
Tamaneen and similar soils: 5 percent<br />
Work 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 />
402F—Reedwest-Rock outcrop complex,<br />
15 to 60 percent slopes, very stony<br />
Setting<br />
Elevation: 3,900 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 />
Reedwest and similar soils<br />
Composition: 68 percent<br />
Geomorphic description:<br />
• Side slope backslope on escarpment<br />
• Base slope backslope on escarpment<br />
• Base slope footslope on escarpment<br />
Slope: 15 to 60 percent<br />
Elevation: 3,900 to 6,000 feet<br />
Effective annual precipitation: 15 to 19 inches<br />
Frost-free period: 85 to 115 days<br />
Surface layer texture: Loam<br />
Rock fragments on the soil surface: 0.1 to 3.0 percent<br />
stones, 3 to 27 feet apart<br />
Depth to bedrock (paralithic): 20 to 40 inches<br />
Drainage class: Well drained<br />
Parent material: Loamy residuum weathered from<br />
sandstone and siltstone<br />
Native plant cover type: Forestland<br />
Available water capacity: Mainly 4.6 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: Dike<br />
Additional Components<br />
Farnuf and similar soils: 4 percent<br />
Cabba and similar soils: 3 percent<br />
Rubble land: 3 percent<br />
Castner and similar soils: 2 percent<br />
Management<br />
For management information about this map unit,<br />
see appropriate sections in Part II <strong>of</strong> this publication.<br />
403F—Cabba-Castner-Rock outcrop<br />
complex, moist, 25 to 60 percent<br />
slopes<br />
Setting<br />
Field investigation intensity: Order 2<br />
Elevation: 3,900 to 6,000 feet<br />
Mean annual precipitation: 15 to 19 inches<br />
Frost-free period: 85 to 115 days
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