All data available in The National Map Small-Scale website can be downloaded at no cost. Small-Scale Data and Documentation are accessible from the table below. This table lists all of the map layers currently contained in nationalmap.gov, by the broad subject categories used by The National Map.
http://nationalmap.gov/small_scale/atlasftp.html?openChapters=%2Cchpwater#chpwater
Small-Scale Data Download
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