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Important for you to know:

  • New to WDFN: explore current and historic water data available in your area of interest and filter to find monitoring locations that collect the water data you need through Explore USGS Water Data. To learn more, read our announcement on the Water Data for the Nation blog.

Hydrological Unit: Hammonasset River-Frontal Long Island Sound

HUC Name
011000040201 Menunketesuck River
011000040202 Hammonasset River-Frontal Clinton Harbor
011000040203 East River-Frontal Guilford Harbor
011000040204 West River-Frontal Guilford Harbor
011000040205 Branford River
011000040206 Farm River
011000040207 Patchogue River-Frontal Westbrook Harbor
011000040208 Indian River-Frontal Long Island Sound