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This online map allows the user to pan across the state, zoom to areas of interest and identify lots of information about your watershed.  Available data include size of watershed, 305(b) use support, along with pollutant type and source of impairment, summary sheet of facts and statistics on watersheds (HUC11 scale) and much more.  For help with fields and codes of the use support data in this viewer, see the 305b GIS Attributes.
EPA provides a similar online map to the Kentucky Watershed Viewer but also provides a searchable database of lake and stream conditions.