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NRCS Web Soil Survey : USDA Natural Resources Conservation Service (NRCS)
Web Soil Survey (WSS) provides soil data and information produced by the National Cooperative Soil Survey. It is operated by the USDA Natural Resources Conservation Service (NRCS) and provides access to the largest natural resource information system in the world. NRCS has soil maps and data available online for more than 95 percent of the nation’s counties and anticipates having 100 percent in the near future. The site is updated and maintained online as the single authoritative source of soil survey information.
Soil surveys can be used for general farm, local, and wider area planning. Onsite investigation is needed in some cases, such as soil quality assessments and certain conservation and engineering applications.
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Maintenance Schedule for Web Soil Survey
- Web Soil Survey will occasionally be unavailable on Tuesdays and Thursdays after 8:00 PM Eastern time for scheduled maintenance and software updates.
- Nightly maintenance causes sessions to restart at 2:00 am Eastern Time each night.Web Soil Survey is ready for new sessions a few minutes later.
Using the soil survey
- Obtain a printed soil survey from the NRCS, USDA office, or local conservation office or access an online version.
- Open the soil survey to Index To Map Sheets
- Locate your area of interest or property on the Index.
- The numbers in rectangles correspond to the map sheet number located in the second half of the publication.
- Look at the aerial map closely and locate landmarks such as roads or streams to find your area of interest.
- The lines on the image separate different soil types. Your area of interest may include one or more types.
- The small letters or numbers that are within the same polygon as your area of interest, such as ScC, or KnC, or LaC designate a map unit. Note this map unit symbol. It is the key to finding information.
- Turn to the Index to Map Units which shows the page where these map units are described. Also go to the various tables or reports which are organized by map unit symbol.
- This process is simplified in Web Soil Survey but follows the same sequence:
- Locate your area of interest of the maps.
- Note the map unit symbol.
- Go to the text or tables for information on that map unit.
- If you find a term or soil description in the detailed information sheet on your soil and you would like to learn what that term means, go the Glossary section of the report. The Glossary is located in the center of the publication.
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Using the soil survey – Tables
- The Tables section of the soil survey report provides detailed information on soil properties and their suitability and limitations as well as management and production potential of the various soils.
- The Tables section has detailed information on engineering index properties, physical and chemical properties, and soil and water features.
- The Tables section also has detailed information on soil use, such as crops and pasture, recreation, and engineering.
- To use the tables, simply remember your map unit symbol and find it in the appropriate table.
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