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Water-Year Summary for Site 02330450

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Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00045 Precipitation(Sum)  
00060 Discharge(Mean)  
00065 Gage height(Max.,Min.,Mean)  

Water year 2019: 2019-10-01 to 2020-09-30
 

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USGS Water-Year Summary 2019
02330450 CHATTAHOOCHEE RIVER AT HELEN, GA
LOCATION - Lat 34°42'03", long 83°43'44" referenced to North American Datum of 1983, White County, GA, Hydrologic Unit 03130001, on downstream side of bridge on GA 17 and 75 at Helen, and 1.1 miles downstream from Smith Creek.
DRAINAGE AREA - 44.7 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD -
DISCHARGE: Miscellaneous low-flow measurements in water years 1953 and 1955. May 1981 to current year.
GAGE HEIGHT: October 1998 to current year.
GAGE - Satellite telemetry with a water-stage recorder and continuous water-temperature thermistor. Datum of gage is 1,404.04 feet above National Geodetic Vertical Datum (NGVD) of 1929.
COOPERATION - U.S. Army Corps of Engineers, Mobile District.
REMARKS -
For period 10/01/2013-10/24/2018: Discharge record fair, except for periods of estimated discharge, which are poor. Gage height record good.
For period 10/25/2018-05/07/2019: Discharge record fair, except for periods of estimated discharge, which are poor. Gage height record fair.

Some regulation occurs at low-flow on Smith Creek by Unicoi Lake at Unicoi State Park.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of August 23, 1967, reached a discharge of 11,000 cfs from contracted-opening computation at highway bridge 2.0 miles downstream at a drainage area of 48.2 mi².
EXTREMES FOR PERIOD OF RECORD - Maximum discharge recorded, 5,260 cfs, September 16, 2004; maximum gage height recorded, 6.75 feet, September 16, 2004; minimum daily discharge, 20 cfs, October 6, 1986, October 2, 15, 2007, and September 29, 30, 2016.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - April 2003 to current year.
INSTRUMENTATION - Tipping-bucket raingage.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: July 2003 to current year.
INSTRUMENTATION - Satellite telemetry with a continuous water temperature thermistor.
REMARKS -
For period 10/01/2013-02/28/2018: Water temperature records good.
EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Maximum recorded, 32.6°C, August 21, 2007; minimum recorded, -0.2°C, February 20, 2015.
EXTREMES FOR CURRENT YEAR - WATER TEMPERATURE: Maximum recorded, 22.3°C, June 28; minimum recorded, 3.4°C, December 22 and February 17.