LOCATION.--Lat 41°04'30.6", long 72°20'22.4" referenced to North American Datum of 1983, Suffolk County, NY, Hydrologic Unit 02030202, at southeast corner of Ferry Road (Route 114) and Manwaring Road, Shelter Island.
WELL CHARACTERISTICS.--Depth 59 ft. Upper casing diameter 6 in; top of first opening 47 ft, bottom of last opening 57 ft.
DATUM.--Land-surface datum is 39.6 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of steel flange, 1.88 ft below land-surface datum, 37.72 ft above National Geodetic Vertical Datum of 1929, Mar. 5, 1974 to present.
PERIOD OF RECORD.--June 1974 to current year.
GAGE.--Water level recorder installed January 2020 to January 2025; 15-minute recording interval. Periodic manual measurements by USGS personnel.
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 8.88 ft above NGVD of 1929, Apr. 20, 2010; lowest measured, 2.42 ft above NGVD of 1929, Dec. 12, 1981.

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