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USGS 403929073382908 N 53. 1

PROVISIONAL DATA SUBJECT TO REVISION

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> Site Information
LOCATION.--Lat 40°39'30.5", long 73°38'27.7" referenced to North American Datum of 1983, Nassau County, NY, Hydrologic Unit 02030202, at Rockville Centre Municipal Power Plant, in battery room, Maple Avenue and Morris Avenue, Rockville Centre.
WELL CHARACTERISTICS.--Depth 50 ft. Upper casing diameter 8 in; top of first opening undefined, bottom of last opening undefined. Screen assumed at bottom.
DATUM.--Land-surface datum is 26.2 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of 2-in steel extender, 5.24 ft below land-surface datum, 20.96 ft above land-surface datum, Aug. 31, 1934 to present.
PERIOD OF RECORD.--August 1934 to current year. Unpublished records for August 1934 to September 1975 are available in files of the U.S. Geological Survey.
GAGE.--Periodic manual measurements by USGS personnel.
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 16.49 ft above NGVD of 1929, Apr. 15, 1939; lowest measured, 7.61 ft above NGVD of 1929, Aug. 21, 2002.
> Rating Information
Available Parameters Available Period
  
2026-02-12  2026-05-27








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Summary of all available data for this site
Instantaneous-data availability statement

Groundwater level above NAVD 1988, feet
Most recent instantaneous value: 10.78 05-27-2026   13:00 EST
Graph of Groundwater level above NAVD 1988, feet

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Field Visit data are no longer available on this page, please go to the new Monitoring Location pages to see the field visit data graphed with the time series data. See this graph on the Monitoring Location Pages

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