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147 estuaries in the contiguous United States are classified into three average annual salinity zones: Tidal Fresh (0-0.5 ppt), Mixing (0.5-25 ppt), and Seawater (≥25 ppt). This static geographic dataset, created by NOAA's National Estuarine Inventory and refined in the 1990s, provides a foundational spatial framework for long-term resource assessments. Its cross-platform presence on NASA Earthdata and Data.gov signals its established use in federal science and management programs.
The dataset represents a long-term average condition and is not suitable for analyzing dynamic, short-term salinity changes. License information is not specified.