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Soil Survey of Powell County Area, Montana

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Soil Survey of Powell County Area, Montana How to Use This Soil Survey Detailed Soil Maps The detailed soil maps can be useful in planning the use and management of small areas. To find information about your area of interest, you can locate the Section, Township, and Range by zooming in on the Index to Map Sheets, or you can go to the Web Soil Survey at (http://websoilsurvey.nrcs.usda.gov/app/). Note the map unit symbols that are in that area. The Contents lists the map units by symbol and name and shows the page where each map unit is described. See the Contents for sections of this publication that may address your specific needs. ii This soil survey is a publication of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (formerly the Soil Conservation Service) has leadership for the Federal part of the National Cooperative Soil Survey. Major fieldwork for this soil survey was completed in 1989. Soil names and descriptions were approved in 1991. Unless otherwise indicated, statements in this publication refer to conditions in the survey area in 1991. This survey was made cooperatively by the Natural Resources Conservation Service and the Montana Agricultural Experiment Station. It is part of the technical assistance furnished to the Deer Lodge Valley and North Powell Conservation Districts. Financial assistance was provided by the Old West Regional Commission in cooperation with the Montana Department of State Lands and the Montana Association of Conservation Districts, the Board of County Commissioners, and Powell County. The most current official data are available through the NRCS Soil Data Mart website at http://soildatamart.nrcs.usda.gov. Soil maps in this survey may be copied without permission. Enlargement of these maps, however, could cause misunderstanding of the detail of mapping. If enlarged, maps do not show the small areas of contrasting soils that could have been shown at a larger scale. The United States Department of Agriculture (USDA) prohibits discrimination in all of its programs on the basis of race, color, national origin, gender, religion, age, disability, political beliefs, sexual orientation, and marital or family status. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact the USDA’s TARGET Center at 202-720-2600 (voice or TDD). To file a complaint of discrimination, write USDA, Director, Office of Civil Rights, Room 326W, Whitten Building, 14th and Independence Avenue SW, Washington, DC 20250-9410, or call 202-720-5964 (voice or TDD). USDA is an equal opportunity provider and employer. Cover: Deer Lodge Mountain and Mount Powell in southern Powell County Area. The lower elevation forested soils are mainly Worock gravelly loam, and the rangeland soils are mainly Roy- Shawmut-Danvers complex. Additional information about the Nation’s natural resources is available online from the Natural Resources Conservation Service at http://www.nrcs.usda.gov. iii Contents Part I 379E—Ambrant-Rochester-Rock outcrop complex, 15 to 35 percent slopes................ 30 How To Use This Soil Survey .................................. i 379F—Ambrant-Rochester-Rock outcrop Index to Taxonomic Units ................................... xiv complex, 35 to 60 percent slopes................ 31 Index to Map Units ............................................... xv Anaconda Series ............................................... 32 Summary of Tables .............................................xxiv 35B—Anaconda loam, 0 to 4 percent slopes .... 33 Foreword ............................................................ xxvii Aquents.............................................................. 33 Introduction ............................................................ 1 4—Aquents-Slickens complex, 0 to 2 percent General Nature of the Survey Area ..................... 1 slopes, occasionally flooded ....................... 33 History.................................................................. 1 Baggs Series ..................................................... 34 Industry, Transportation, and Recreation ............. 2 135B—Baggs sandy loam, 0 to 4 percent Physiography and Drainage................................. 2 slopes .......................................................... 35 Geologic History and Regional Geology ............. 3 135C—Baggs sandy loam, 4 to 8 percent Geologic Units ..................................................... 4 slopes .......................................................... 35 Mineral Resources ............................................... 5 135D—Baggs sandy loam, 8 to 15 percent Ground-Water Resources .................................... 6 slopes .......................................................... 35 Seismic Activity .................................................... 6 479B—Baggs sandy loam, cool, 0 to 4 Climate................................................................. 6 percent slopes ............................................. 36 How This Survey Was Made .................................... 7 Beaverell Series ................................................. 36 Formation and Classification of the Soils .......... 13 132B—Beaverell cobbly loam, 0 to 4 percent Formation of the Soils ........................................ 13 slopes .......................................................... 37 Classification of the Soils ................................... 14 132C—Beaverell cobbly loam, 4 to 8 percent Soil Series and Detailed Soil Map Units ............. 25 slopes .......................................................... 38 Ambrant Series .................................................. 26 332B—Beaverell loam, 0 to 4 percent slopes.... 38 79D—Ambrant-Rochester complex, cool, Bignell Series ..................................................... 38 4 to 15 percent slopes ................................. 27 99D—Bignell gravelly clay loam, 8 to 15 79E—Ambrant-Rochester complex, cool, percent slopes ............................................. 39 15 to 35 percent slopes ............................... 27 99E—Bignell gravelly clay loam, 15 to 35 79F—Ambrant-Rochester complex, cool, percent slopes ............................................. 40 35 to 60 percent slopes ............................... 28 99F—Bignell gravelly clay loam, 35 to 60 179E—Ambrant-Rochester complex, 15 to 35 percent slopes ............................................. 40 percent slopes ............................................. 28 199E—Bignell gravelly clay loam, cool, 179F—Ambrant-Rochester complex, 35 to 60 15 to 35 percent slopes ............................... 40 percent slopes ............................................. 29 199F—Bignell gravelly clay loam, cool, 279E—Ambrant, cool-Rochester, cool-Rock 35 to 60 percent slopes ............................... 41 outcrop complex, 15 to 35 percent 299E—Bignell-Yreka complex, 15 to 35 slopes .......................................................... 29 percent slopes ............................................. 41 279F—Ambrant, cool-Rochester, cool-Rock 299F—Bignell-Yreka complex, 35 to 60 outcrop complex, 35 to 60 percent slopes... 30 percent slopes ............................................. 41 iv 399E—Bignell-Yreka complex, cool, 15 to 35 242C—Braziel-Perma gravelly loams, 4 to 8 percent slopes ............................................. 42 percent slopes ............................................. 56 399F—Bignell-Yreka complex, cool, 35 to 60 242D—Braziel gravelly loam, 8 to 15 percent percent slopes ............................................. 42 slopes .......................................................... 56 499D—Bignell, cool-Yreka complex, 8 to 15 242E—Braziel gravelly loam, 15 to 35 percent percent slopes ............................................. 43 slopes .......................................................... 56 499E—Bignell, cool-Yreka complex, 15 to 35 342D—Braziel stony loam, 8 to 15 percent percent slopes ............................................. 43 slopes .......................................................... 57 499F—Bignell, cool-Yreka complex, 35 to 60 342E—Braziel stony loam, 15 to 35 percent percent slopes ............................................. 44 slopes .......................................................... 57 699D—Bignell gravelly loam, 8 to 15 percent 342F—Braziel stony loam, 35 to 60 percent slopes .......................................................... 44 slopes .......................................................... 58 699E—Bignell gravelly loam, 15 to 35 percent 442D—Braziel-Tolbert complex, 8 to 15 slopes .......................................................... 45 percent slopes ............................................. 58 699F—Bignell gravelly loam, 35 to 60 percent 442E—Braziel-Tolbert complex, 15 to 35 slopes .......................................................... 45 percent slopes ............................................. 58 799D—Bignell-Yreka-Crow complex, 8 to 15 442F—Braziel-Tolbert complex, 35 to 60 percent slopes ............................................. 46 percent slopes ............................................. 59 799E—Bignell-Yreka-Crow complex, 15 to 35 742E—Braziel-Perma-Water complex, 8 to 25 percent slopes ............................................
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