POQUONOCK RIVER BASIN 01119040 POQUONOCK RIVER NEAR GROTON, CT LOCATION.--Lat 41o19'00", long 72o03'43", New London County, Hydrologic Unit 01100003, at pier on east side of Avery Point, University of Connecticut, 2 mi south of Groton, at mouth of Poquonock River in Long Island Sound. PERIOD OF RECORD.--January 1973 to current year. GAGE.--Water-stage recorder. Datum of staff gage is 10.00 ft below sea level. Prior to Apr. 30, 1982, at datum 7.98 ft higher; prior to May 4, 1986, at datum 7.20 ft higher. Datum of gage-height record is 10.00 ft below sea level in order to prevent negative values and is converted to elevation above or below (-) sea level for publication. REMARKS.--Stage data in feet at 15-minute intervals available upon request. EXTREMES FOR PERIOD OF RECORD.-- Maximum tidal elevation, 6.63 ft, Feb. 6, 1978; minimum, -5.02 ft, Feb. 2, 1976. EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum tidal elevation, 9.7 ft, Sept. 21, 1938 at site 2.7 mi upstream on Thames River at New London Pier and at same datum, gage operated by National Ocean Survey. EXTREMES FOR CURRENT YEAR.--Maximum tidal elevation recorded, 4.33 ft, Jan. 8; minimum, -3.19 ft, Mar. 4. TIDE ELEVATIONS, IN FEET, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996 _________________________________________________________________________________________________________________ OCT NOV DEC JAN FEB MAR APR MAY JUNE JULY AUG SEPT _________________________________________________________________________________________________________________ Maximum Elevation 3.59 4.09 4.12 4.33 3.19 3.62 3.89 3.22 3.20 3.53 3.14 4.13 high tide Date 7 15 20 8 17 19 10 30 30 13 27 17 Time 0800 0145 0630 0945 0700 2200 0145 1915 2030 1845 1945 1215 Minimum Elevation -1.46 -1.60 -2.26 -1.69 -1.91 -3.19 -1.04 -1.38 -1.26 -1.10 -0.96 -1.05 low tide Date 30 28 21 6 19 4 4 7 2 29 29 27 Time 1430 2030 1500 0230 0300 0230 0345 0615 0345 0215 0315 0300 NOTE.-- Time shown is eastern standard.