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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304 <strong>Soil</strong> <strong>Survey</strong><br />
Rock fragments on the soil surface: 3 to 15 percent<br />
boulders, 3 to 20 feet apart<br />
Drainage class: Well drained<br />
Parent material: Gravelly glaci<strong>of</strong>luvial deposits<br />
weathered from limestone and sandstone<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 6.5 inches<br />
Work and similar soils<br />
Composition: 35 percent<br />
Geomorphic description:<br />
• Base slope toeslope on moraine<br />
• Base slope footslope on moraine<br />
Slope: 8 to 35 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: Gravelly loam<br />
Rock fragments on the soil surface: 3 to 15 percent<br />
boulders, 3 to 20 feet apart<br />
Drainage class: Well drained<br />
Parent material: Clayey alluvium<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 8.3 inches<br />
Bowery and similar soils<br />
Composition: 20 percent<br />
Geomorphic description: Moraine and swale<br />
Slope: 8 to 35 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: Loam<br />
Drainage class: Well drained<br />
Parent material: Loamy alluvium or colluvium<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 10.6 inches<br />
Additional Components<br />
Farnuf 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 />
420E—Tibson, extremely bouldery-<br />
Bridger, extremely bouldery-Adel<br />
complex, 8 to 35 percent 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 />
Bridger and similar soils<br />
Composition: 39 percent<br />
Geomorphic description: Base slope footslope on<br />
moraine<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: Cobbly clay loam<br />
Rock fragments on the soil surface: 3 to 15 percent<br />
boulders, 3 to 20 feet apart<br />
Drainage class: Well drained<br />
Parent material: Silty and clayey alluvium<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 7.7 inches<br />
Tibson and similar soils<br />
Composition: 35 percent<br />
Geomorphic description:<br />
• Nose slope summit on moraine<br />
• Nose slope shoulder on moraine<br />
• Side slope shoulder on moraine<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: Gravelly loam<br />
Rock fragments on the soil surface: 3 to 15 percent<br />
boulders, 3 to 20 feet apart<br />
Drainage class: Well drained<br />
Parent material: Gravelly till, unspecified<br />
Native plant cover type: Rangeland<br />
Available water capacity: Mainly 5.1 inches