** Important Notice **
The returned data are based upon the latest information available as of the date of your request.
The official Tide and Tidal Current prediction tables are published annually on October 1, for
the following calendar year. Tide and Tidal Current predictions requested prior to the publishing
date of the official tables are subject to change. See note below about Daylight Saving Time.
A description of input and output parameters is available here Stations Listing
To view the stations' listing and their sensors' configuration click here. XML Format
Click here to retrieve data in an XML format
For Water Level Data, the user can retrieve up to a maximum of one month worth of six minute data. The rest of the data sets can be retrieved up to a maximum of one year except for the high/lows and the daily mean data which have a maximum of five years.
A valid retrieval date for the verified data would be going back to the first of the current month, then two months back. For example, if today's date is March 2nd or March 29th, start with March 1st and subtract two months. The most recent date available for data extraction would be January 1st.
Water Level High/Low Data is available for coastal stations, and not for Great Lakes stations.
Water Level Daily Mean Data is only available for Great Lakes stations, and not for coastal stations.
Tidal datums (MLLW, MSL, MHW, etc) are available for coastal stations, and not for Great Lakes stations.
IGLD (International Great Lakes Datum) is only available for Great Lakes stations.
* Note: The Energy Policy Act of 2005 changed the start/end dates of Daylight Saving Time. Starting in 2007, Daylight Saving Time will begin on the 2nd Sunday in March and end on the 1st Sunday in November. The predictions provided have been adjusted for Daylight Saving Time based on these criteria.
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Center for Operational Oceanographic Products and Services Data Disclaimer
These raw data have not been subjected to the National Ocean Service's quality control or
quality assurance procedures and do not meet the criteria and standards of official National
Ocean Service data. They are released for limited public use as preliminary
data to be used only with appropriate caution.