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NHD INDEXED LOCATIONS FOR SECTION 305(B) LISTED WATERS
Description:
River segments, lakes, and estuaries designated under Section 305(b) of the Clean Water Act. 305(b) Waterbodies are coded onto route.rch (Transport and Coastline Reach) feature of NHD to create Point and Linear Events. Linear events, Point events and waterbody shapefiles are attached to a reach in NHD to represent assessed and non-assessed waters. 305(b) Waterbodies are coded onto the region reach feature of NHD to create Waterbody shapefiles. In addition to NHD reach indexed data there may also be custom shapefiles (point, line, or polygon) that are not associated with NHD and are in an EPA standard format that is compatible with EPA's Reach Address Database. These custom shapefiles are used to represent locations of 305(b) waterbodies that are not represented well in NHD.