POQUONOCK RIVER BASIN 01119040 POQUONOCK RIVER NEAR GROTON, CT LOCATION.--Lat 4119'00", long 7203'43", 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. Telephone gage-height telemeter at this station. 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, 4.54 ft, Jan. 10; minimum, -2.21 ft, Mar. 7. TIDE ELEVATIONS, IN FEET, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997 ________________________________________________________________________________________________________________ OCT NOV DEC JAN FEB MAR APR MAY JUNE JULY AUG SEPT ________________________________________________________________________________________________________________ Maximum Elevation 4.39 3.75 3.94 4.54 3.94 3.73 3.87 3.46 3.46 3.15 4.44 3.43 high tide Date 20 9 9 10 5 31 19 3 5 3 21 18 Time 0145 0745 0745 0930 0630 1430 1915 1845 2145 2045 1115 1000 Minimum Elevation -0.89 -1.23 -1.84 -1.93 -1.37 -2.21 -1.24 -1.27 -0.84 -1.12 -0.98 -0.94 low tide Date 15 12 20 8 25 7 10 8 24 21 19 17 Time 1700 1615 1215 1445 0515 0130 0545 0430 0600 0400 0345 0315 ________________________________________________________________________________________________________________ NOTE.-- Time shown is Eastern standard.