Note: Small deviations possibly found in the table values are due to rounding in calculations.
Soil Survey Staff, Natural Resources Conservation Service, United States Department of Agriculture. Soil Survey Geographic (SSURGO) Database. Available online at https://sdmdataaccess.sc.egov.usda.gov/
For most recent data, please go to the previous link.
The soils layer shows map units, which are collections of areas defined and named the same in terms of their soil components. For simplicity, the term soil here refers to a map unit. The following attributes have been extracted from SSURGO and included here:
Mapunit Symbol: Label used on map to identify each soil.
Mapunit Name: Name of soil.
Slope Gradient: Percent slope.
Potential Erosion Hazard: The relative potential erosion hazard for the soil when used as a site for forest roads and trails, expressed as a rating class including Not Rated, Slight, Moderate, Severe, and Very Severe.
Flooding Frequency: The annual probability of a flood event expressed as a class including None, Very Rare, Rare, Occasional, Frequent, and Very Frequent.
Drainage Class: The natural drainage condition of the soil refers to the frequency and duration of wet periods including Excessively Drained, Somewhat Excessively Drained, Well Drained, Moderately Well Drained, Somewhat Poorly Drained, Poorly Drained, Very Poorly Drained.
Hydric Rating: Percentage of map unit considered hydric.
pH Top Horizon: pH of top horizon as determined using the 1:1 soil-water ratio method. A measure of the relative acidity or alkalinity of a soil sample (acid < 7; alkaline > 7).
Ecological Class ID: Ecological Classification ID is the identifier of a particular ecological community. It also serves as a hyperlink to NRSC information about that Ecological Class.
Ecological Class: Ecological Classification Name is the descriptive name of a particular ecological community.
Range Productivity (lb/ac/yr): The estimated annual production of range forage in pounds per acre per year.
Forest productivity (cuft/ac/yr): The annual growth of forest overstory trees in cubic feet per acre per year.
Site Index Max Values: Weighted average of the highest site index (height of trees at 50 years of age) value for any tree species within a component for each soil (map unit).
Site Index Max Value Species: Tree species of the calculated weighted average of the highest site index.
Survey Area Version: Survey area version number and availability date.
Tabular Version: Tabular data version number and availability date.
Spatial Version: Spatial data version number and availability date.