LOCATION.--Lat 40°46'06", long
73°58'37" referenced to North American Datum of 1927,
New York County, NY, Hydrologic Unit 02030101, at Central Park,
120 ft west of Center Drive, just north of entrance drive from
6th Avenue, Manhattan.
WELL CHARACTERISTICS.--Depth 72.5 ft. Upper casing
diameter 3 in; top of first opening 3 ft, bottom of last
opening 72.5 ft. Cased to 3 ft, open hole.
DATUM.--Land-surface datum is 56 ft above National
Geodetic Vertical Datum of 1929. Measuring point: Top of
casing, 0.34 ft below land-surface datum, 55.66 ft above
National Geodetic Vertical Datum of 1929, Jun. 28, 2005 to Oct.
5, 2010; unknown,, 55.49 ft above National Geodetic Vertical
Datum of 1929, Oct. 5, 2010 to present.
PERIOD OF RECORD.--November 2005 to April 2013, December
2024 to current year.
GAGE.--Periodic manual measurements by USGS
personnel.
EXTREMES FOR PERIOD OF RECORD.--Highest water level
measured, 50.51 ft above NGVD of 1929, Apr. 22, 2009; lowest
measured, 45.78 ft above NGVD of 1929, Aug. 24, 2006.