Horizon SystemsNHDPlus Version 1 (Archive)DataMid Atlantic
 
 
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Mid-Atlantic (Hydrologic Region 02)

The Mid-Atlantic drainage area is composed of hydrologic region 02.

The Mid-Atlantic hydrologic regions are further divided into production units:  02 a and b.

NHDPlus Shapefile and DBF components are distributed by hydrologic region.

NHDPlus ESRI Grid components are distributed by production units.

For more information please see Mid-Atlantic Release Notes in DOC, PDF.


Download instructions:

Right click on a file name in the table below and choose "save file to disk." 
(or)
Go to ftp://ftp.horizon-systems.com. Right click on a file and choose "save file to disk."
(or)
You may connect to the NHDPlus FTP site (ftp://ftp.horizon-systems.com) with an FTP client. FTP clients are generally faster than file transfer through a browser.

Mid Atlantic

Filename Key
NHDPlusrrVnn_componentname.zip
where:
rr is the hydrologic region number
nn is the currently available version of the data
componentname describes the content of the zip file
File Description File Name (.zip***) Format
Region 02 , Version 01_01, Catchment Grid NHDPlus02V01_01_Catgrid ESRI Grid*
Region 02, Version 01_01, Catchment Shapefile NHDPlus02V01_01_Catshape Shapefile**
Region 02, Version 01_02, Catchment Flowline Attributes NHDPlus02V01_02_Cat_Flowline_Attr DBF****
Region 02, Version 01_02, Elevation Unit a NHDPlus02V01_02_Elev_Unit_a ESRI Grid
Region 02, Version 01_02, Elevation Unit b NHDPlus02V01_02_Elev_Unit_b ESRI Grid
Region 02, Version 01_01, Flow Accumulation and Flow Direction Unit a NHDPlus02V01_01_FAC_FDR_Unit_a ESRI Grid
Region 02, Version 01_01, Flow Accumulation and Flow Direction Unit b NHDPlus02V01_01_FAC_FDR_Unit_b ESRI Grid
Region 02, Version 01_01, National Hydrography Dataset NHDPlus02V01_02_NHD Shapefile and DBF
Region 02, Version 01_01, QAQC & Sinks Spreadsheet NHDPlus02V01_01_QAQC_Sinks Excel Spreadsheet
Region 02, Version 01_01, Stream Gage Event NHDPlus02V01_01_StreamGageEvent DBF

*An ESRI Grid is a proprietary format for a raster dataset that defines space as an array of equally sized cells arranged in rows and columns.  Each cell contains an attribute value and location coordinates. Unlike a vector structure, which stores coordinates explicitly, raster coordinates are contained in the ordering of the matrix. Groups of cells that share the same value represent the same type of geographic feature.

**A Shapefile is a published, but proprietary, data format from the Environmental Systems Research Institute, Inc. (ESRI).

***Zip is a common type of file compression.

****DBF