Soil Survey of Sweet Grass County Area, Montana - Soil Data Mart

174 Soil Survey
areas are somewhat similar in all areas. Cabbart-
Tanna complex, 2 to 8 percent slopes, is an example.
This survey includes miscellaneous areas. They
have little or no soil material and support little or no
vegetation. Rock outcrop is an example.
The “Acreage and Proportionate Extent of the
Soils” table gives the acreage and proportionate
extent of each map unit. Other tables (see “Summary
of Tables”) give properties of the soils and the
limitations, capabilities, and potentials for many uses.
Many of the terms used in describing the soils or
miscellaneous areas are defined in the “Glossary.”
100B—Nesda-Meadowcreek-Clunton
loams, 0 to 4 percent slopes
Setting
Field investigation intensity: Order 2
Elevation: 3,750 to 4,300 feet
Mean annual precipitation: 10 to 14 inches
Frost-free period: 95 to 130 days
Major Component Description
Nesda and similar soils
Composition: 40 percent
Geomorphic description: Flood plain
Slope: 0 to 4 percent
Elevation: 3,750 to 4,300 feet
Effective annual precipitation: 10 to 14 inches
Frost-free period: 95 to 130 days
Surface layer texture: Loam
Drainage class: Well drained
Parent material: Sandy and gravelly alluvium
Native plant cover type: Forestland
Flooding: Occasional
Available water capacity: Mainly 3.8 inches
Meadowcreek and similar soils
Composition: 30 percent
Geomorphic description: Flood plain
Slope: 0 to 2 percent
Elevation: 3,750 to 4,300 feet
Effective annual precipitation: 10 to 14 inches
Frost-free period: 95 to 130 days
Surface layer texture: Loam
Drainage class: Somewhat poorly drained
Parent material: Fine-loamy over sandy and gravelly
alluvium
Native plant cover type: Rangeland
Flooding: Rare
Water table: Present
Available water capacity: Mainly 6.3 inches
Clunton and similar soils
Composition: 25 percent
Geomorphic description: Depression and flood plain
Slope: 0 to 4 percent
Elevation: 3,750 to 4,300 feet
Effective annual precipitation: 10 to 14 inches
Frost-free period: 95 to 130 days
Surface layer texture: Muck
Drainage class: Very poorly drained
Parent material: Fine-loamy alluvium over sandy and
gravelly alluvium
Native plant cover type: Rangeland
Flooding: Frequent
Water table: Present
Ponding duration: Brief
Available water capacity: Mainly 10.2 inches
Additional Components
McIlwaine and similar soils: 5 percent
Management
For management information about this map unit,
see appropriate sections in Part II of this publication.
102B—Ledger family, clay loam,
1 to 4 percent slopes
Setting
Elevation: 3,750 to 5,200 feet
Mean annual precipitation: 10 to 14 inches
Frost-free period: 95 to 125 days
Major Component Description
Ledger and similar soils
Composition: 85 percent
Geomorphic description: Flood plain
Slope: 1 to 4 percent
Elevation: 3,750 to 5,200 feet
Effective annual precipitation: 10 to 14 inches
Frost-free period: 95 to 125 days
Surface layer texture: Clay loam
Drainage class: Somewhat poorly drained
Parent material: Clayey alluvium
Native plant cover type: Rangeland
Flooding: Rare
Water table: Present
Salt affected: Saline within 30 inches
Sodium affected: Sodic within 30 inches
Available water capacity: Mainly 6.9 inches