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Derived from 1:250,000-scale USGS HUC 8 boundaries, this dataset
represents the soil fines fraction for the western USA. A weighted
average was created for each HUC 8 watershed using approximate EMAP
physical habitat substrate criteria. The values are expressed as percent
by weight.
Data Provided By:
US EPA/ORD/NERL/ESD Landscape Ecology Branch, NRCS STATSGO
http://www.epa.gov/esd/land-sci/emap_west_browser/pages/wemap_download.htm
Layers in this dataset are based on combinations of the following options.
You may choose from these options to select a specific layer on the map page.