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

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302 Soil Survey Libeg and similar soils Composition: 15 percent Geomorphic description: • Mountainflank backslope on mountain • Mountainbase footslope on mountain Slope: 15 to 60 percent Elevation: 5,500 to 7,500 feet Effective annual precipitation: 20 to 25 inches Frost-free period: 50 to 70 days Surface layer texture: Very cobbly sandy loam Drainage class: Well drained Parent material: Gravelly till Native plant cover type: Rangeland Available water capacity: Mainly 3.8 inches Additional Components Monaberg and similar soils: 8 percent Redchief and similar soils: 7 percent Bridger and similar soils: 5 percent Millerlake and similar soils: 5 percent Management For management information about this map unit, see appropriate sections in Part II of this publication. 415F—Rocko-Adel complex, 15 to 45 percent slopes Setting Elevation: 5,500 to 7,500 feet Mean annual precipitation: 20 to 25 inches Frost-free period: 50 to 70 days Major Component Description Rocko and similar soils Composition: 60 percent Geomorphic description: Mountainflank backslope on mountain Slope: 15 to 45 percent Elevation: 5,500 to 7,500 feet Effective annual precipitation: 20 to 25 inches Frost-free period: 50 to 70 days Surface layer texture: Cobbly loam Rock fragments on the soil surface: 0.1 to 3.0 percent stones Drainage class: Well drained Parent material: Gravelly colluvium weathered from sandstone and gravelly colluvium Native plant cover type: Forestland Available water capacity: Mainly 6.7 inches Adel and similar soils Composition: 25 percent Geomorphic description: Mountain and swale Slope: 15 to 35 percent Elevation: 5,500 to 7,500 feet Effective annual precipitation: 20 to 25 inches Frost-free period: 50 to 70 days Surface layer texture: Loam Drainage class: Well drained Parent material: Loamy alluvium or colluvium Native plant cover type: Forestland Available water capacity: Mainly 10.2 inches Additional Components Bridger and similar soils: 5 percent Libeg and similar soils: 5 percent Monaberg and similar soils: 5 percent Management For management information about this map unit, see appropriate sections in Part II of this publication. 416C—Bearmouth, moist-Beehive complex, 2 to 8 percent slopes, extremely stony Setting Elevation: 5,500 to 7,500 feet Mean annual precipitation: 20 to 25 inches Frost-free period: 50 to 70 days Major Component Description Bearmouth and similar soils Composition: 50 percent Geomorphic description: Stream terrace Slope: 2 to 8 percent Elevation: 5,500 to 7,500 feet Effective annual precipitation: 20 to 25 inches Frost-free period: 50 to 70 days Surface layer texture: Very cobbly loam Rock fragments on the soil surface: 3 to 15 percent stones, 2 to 3 feet apart Drainage class: Well drained Parent material: Sandy and gravelly alluvium Native plant cover type: Forestland Available water capacity: Mainly 2.9 inches Beehive and similar soils Composition: 35 percent Geomorphic description: Flood plain
Sweet Grass County Area, Montana—Part I 303 Slope: 2 to 8 percent Elevation: 5,500 to 7,500 feet Effective annual precipitation: 20 to 25 inches Frost-free period: 50 to 70 days Surface layer texture: Gravelly sandy loam Rock fragments on the soil surface: 3 to 15 percent stones, 2 to 3 feet apart Drainage class: Somewhat poorly drained Parent material: Sandy and gravelly alluvium Native plant cover type: Forestland Flooding: Frequent Water table: Present Available water capacity: Mainly 2.6 inches Additional Components Novary and similar soils: 8 percent Libeg and similar soils: 7 percent Management For management information about this map unit, see appropriate sections in Part II of this publication. 417B—Melville cobbly loam, 0 to 4 percent slopes Setting Elevation: 5,500 to 7,500 feet Mean annual precipitation: 20 to 25 inches Frost-free period: 50 to 70 days Major Component Description Melville and similar soils Composition: 85 percent Geomorphic description: Tread on terrace Slope: 0 to 4 percent Elevation: 5,500 to 7,500 feet Effective annual precipitation: 20 to 25 inches Frost-free period: 50 to 70 days Surface layer texture: Cobbly loam Drainage class: Well drained Parent material: Gravelly glaciofluvial deposits Native plant cover type: Forestland Available water capacity: Mainly 9.0 inches Additional Components Redchief and similar soils: 8 percent Bridger and similar soils: 7 percent Management For management information about this map unit, see appropriate sections in Part II of this publication. 418D—Melville cobbly loam, 4 to 15 percent slopes Setting Elevation: 6,000 to 7,500 feet Mean annual precipitation: 20 to 25 inches Frost-free period: 50 to 70 days Major Component Description Melville and similar soils Composition: 85 percent Geomorphic description: Tread on terrace Slope: 4 to 15 percent Elevation: 6,000 to 7,500 feet Effective annual precipitation: 20 to 25 inches Frost-free period: 50 to 70 days Surface layer texture: Cobbly loam Drainage class: Well drained Parent material: Gravelly glaciofluvial deposits Native plant cover type: Forestland Available water capacity: Mainly 9.0 inches Additional Components Redchief and similar soils: 8 percent Bridger and similar soils: 7 percent Management For management information about this map unit, see appropriate sections in Part II of this publication. 419E—Winspect-Work-Bowery, 8 to 35 percent slopes, extremely bouldery Setting Elevation: 5,300 to 6,200 feet Mean annual precipitation: 17 to 20 inches Frost-free period: 70 to 90 days Major Component Description Winspect and similar soils Composition: 35 percent Geomorphic description: • Nose slope summit on moraine • Nose slope shoulder on moraine Slope: 8 to 35 percent Elevation: 5,300 to 6,200 feet Effective annual precipitation: 17 to 20 inches Frost-free period: 70 to 90 days Surface layer texture: Cobbly loam
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How to Use This Soil Survey Detaile
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iii Contents Part I How To Use This
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v Winkler Series...................
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vii 184D—Absarokee-Shambo loams,
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ix 274C—Work clay loam, 4 to 8 pe
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xi 371E—Whitlash cobbly sandy loa
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xiii 448B—Attewan loam, 0 to 4 pe
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xv 424E—Bridger, very stony-Adel
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xvii 359F—Fifer-Cheadle-Monaberg
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xix 369E—Rentsac-Tanna complex, 1
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xxi M-W—Water, miscellaneous ....
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xxv Foreword This soil survey conta
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2 Soil Survey The Lewis and Clark E
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4 Soil Survey 10,000 and 11,500 fee
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6 Soil Survey subsurface folding in
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8 Soil Survey interbeds. It is over
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10 Soil Survey Creek, approximately
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12 Soil Survey disappears during mi
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14 Soil Survey Temperature and Prec
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16 Growing Season (Recorded in the
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18 Soil Survey these organisms die,
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20 Soil Survey great group is ident
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22 Soil Survey firm, very sticky, v
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24 Soil Survey few very fine and fi
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26 Soil Survey moderate fine granul
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28 Soil Survey very friable, slight
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30 Soil Survey Range in Characteris
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32 Soil Survey Depth to the Cr hori
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34 Soil Survey Chroma: 2 to 4 Textu
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36 Soil Survey Texture (less than 2
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38 Soil Survey Clay content: 40 to
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40 Soil Survey Taxonomic Class: Fin
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42 Soil Survey Chroma: 1 or 2 Redox
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44 Soil Survey Chroma: 2 or 3 Textu
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48 Soil Survey Typical Pedon Cambet
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50 Soil Survey flagstones; slightly
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52 Soil Survey Cg2—30 to 34 inche
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54 Soil Survey prismatic structure
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56 Soil Survey Bt horizons Hue: 2.5
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60 Soil Survey sec. 24, T. 4 N., R.
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62 Soil Survey Oi—0 to 1 inch; sl
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64 Soil Survey Reed Point topograph
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66 Soil Survey Bk3 horizon Hue: 7.5
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68 Soil Survey lining pores; 10 per
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70 Soil Survey slightly plastic; ma
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72 Soil Survey moderate coarse pris
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74 Soil Survey subangular blocky st
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76 Soil Survey moderate medium and
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80 Soil Survey Bk1—12 to 19 inche
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82 Soil Survey Bw—11 to 19 inches
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84 Soil Survey Parent material: Cla
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86 Soil Survey brown (10YR 5/4) moi
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88 Soil Survey Chroma: 2 or 3 Textu
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90 Soil Survey A horizon Hue: 10YR
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94 Soil Survey Range in Characteris
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96 Soil Survey peds and lining pore
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98 Soil Survey slightly alkaline (p
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100 Soil Survey Calcium carbonate e
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102 Soil Survey Range in Characteri
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104 Soil Survey Landform: Fan and m
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106 Soil Survey Chroma: 2 or 3 Text
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108 Soil Survey Content of rock fra
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110 Soil Survey Cgk3—49 to 60 inc
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112 Soil Survey A2—7 to 13 inches
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114 Soil Survey medium subangular b
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116 Soil Survey very hard, firm, ve
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118 Soil Survey Reedwest Series Dep
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120 Soil Survey A—0 to 7 inches;
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122 Soil Survey Elevation range: 4,
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124 Soil Survey C horizon Hue: 10YR
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126 Soil Survey Texture (less than
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130 Soil Survey Mean annual air tem
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132 Soil Survey Typical Pedon Soapc
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136 Soil Survey moderately sticky,
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138 Soil Survey Bt2 horizon Hue: 7.
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140 Soil Survey A horizon Hue: 10YR
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142 Soil Survey Tibson Series Depth
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144 Soil Survey Oi—0 to 1 inch; s
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146 Soil Survey Bt1—5 to 11 inche
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148 Soil Survey Elevation range: 5,
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150 Soil Survey 2Bk—21 to 60 inch
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152 Soil Survey A—2 to 5 inches;
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154 Soil Survey Typical Pedon Weedz
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156 Soil Survey common fine to coar
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158 Soil Survey E1—4 to 12 inches
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160 Soil Survey Permeability: Moder
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162 Soil Survey Texture (less than
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173 Detailed Soil Map Units The map
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Sweet Grass County Area, Montana—
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Page 267 and 268: Sweet Grass County Area, Montana—
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Page 343 and 344: 327 References Alexander, R.R., 196
Page 345 and 346: 329 Glossary Ablation till. Loose,
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Soil Survey of Sweet Grass County Area, Montana - Soil Data Mart

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