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Notice - The USGS Water Resources Mission Area's priority is to maintain the safety and well-being of our communities, including providing critical situational awareness in times of flooding in all 50 U.S. states and additional territories. Our hydrologic monitoring stations continue to send data in near real-time to NWISWeb, and we are continuing critical water monitoring activities to protect life and property on a case-by-case basis. The health and safety of the public and our employees are our highest priorities, and we continue to follow guidance from the White House, the CDC, and state and local authorities.
LOCATION.--Lat 40°51'58.4", long 73°42'36.7" referenced to North American Datum of 1983, Nassau County, NY, Hydrologic Unit 02030201, at Beach Road bridge, in Sands Point.
Elevation observations and tidal predictions for this station are reported to NGVD 1929. To convert data to NAVD 1988 subtract 1.10 ft. To convert data to MHHW datum subtract 4.80 ft. These corrections vary from site to site.
1929 is the National Geodetic Vertical Datum of 1929,
formerly called "mean sea level" or "Sea Level
Datum of 1929." NGVD 1929 was a general adjustment of the
first-order level nets fit to mean sea level at 26 tide gages in
the US and Canada.
NAVD 1988 is the North American Vertical Datum of 1988, which is a geodetic datum derived from a general adjustment of the first-order level nets fit to 1 tide gage in eastern Canada.
MHHW is mean higher high water, which is a site-specific datum determined by averaging the highest of the 2 high tides that occur each day over a 19-year tidal epoch. For tide gages with less than 19 years of record, this datum is estimated by correlation with long-term tide gages.
Additional sensor graph(s) available (click on graph or sensor name)
Water elevation, astronomical-tide elevation, and residual water level Graph updated every 15 minutes