USGS Water-Year Summary for Site 02207135

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00045 Precipitation(Sum)
	00060 Discharge(Mean)
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Max.,Min.,Med.)

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Water year 2023: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2023

02207135 LITTLE STONE MOUNTAIN CREEK NEAR STONE MOUNTAIN, GA

LOCATION - Lat 33°49'49.5", long 84°08'21.6" referenced to North American Datum of 1983, Dekalb County, GA, Hydrologic Unit 03070103, on the right downstream bank, located 0.5 miles north of highway U.S. 78, 6.5 miles east of I-285, and 7.4 miles west of Snellivlle, GA.

DRAINAGE AREA - 2.20 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD -
GAGE HEIGHT: November 2012 to current year.

GAGE - Satellite telemetry with a water-stage recorder, automatic sampler, and a continuous water-quality monitor. Datum of gage is 890 feet above National Geodetic Vertical Datum (NGVD) of 1929, from topographic map.

COOPERATION - DeKalb County Department of Watershed Protection.

REMARKS -
For period 11/01/2012 - 09/30/2013: Gage height records good. Discharge records fair, except for those with Estimated Daily Discharge, which are poor.
For period 10/01/2013 - 09/30/2014: Gage height records good. Discharge records fair, except for those with Estimated Daily Discharge, which are poor.
For period 10/01/2014 - 09/30/2015: Gage height records good. Discharge records fair, except for those with Estimated Daily Discharge, which are poor.
For period 10/01/2015 - 09/30/2016: Gage height records good. Discharge records fair, except for those with Estimated Daily Discharge, which are poor.
For period 10/01/2016 - 09/30/2017: Gage height records good. Discharge records fair, except for those with Estimated Daily Discharge, which are poor.
For period 10/01/2017 - 09/30/2018: Gage height records good. Discharge records fair.
For period 10/01/2018 - 09/30/2019: Gage height records good. Discharge records fair except for those with Estimated Daily Discharge, which are poor.
For period 10/01/2019 - 12/30/2020: Gage height records good. Discharge records fair except for those with Estimated Daily Discharge, which are poor.

EXTREMES FOR PERIOD OF RECORD -
Maximum discharge recorded, 800 cfs (estimated), February 3, 2016; maximum gage-height recorded, 6.18 feet, February 3, 2016; minimum daily discharge, 0.38 cfs, October 10, 2016.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - March 8, 2013 to current year.

INSTRUMENTATION - Tipping-bucket raingage.

WATER-QUALITY RECORDS

PERIOD OF RECORD -
March 1999 to November 1999, and September 2013 to current year.

PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: November 2013 to current year. pH: November 2013 to current year. WATER TEMPERATURE: November 2013 to current year. DISSOLVED OXYGEN: November 2013 to current year. TURBIDITY: November 2013 to current year.

INSTRUMENTATION - Satellite telemetry with a continuous water-quality monitor and an automatic refrigerated sampler.

REMARKS -
For period 11/07/2013-09-30-2014: Continuous water temperature, and specific conductance records are good, pH and dissolved oxygen records are fair, and turbidity record is poor.
For period 10/01/2014-09/30/2015: Continuous water temperature, dissolved oxygen, and specific conductance records are good, pH record is fair, and turbidity record is poor.
For period 10/01/2015-09/30/2016: Continuous water temperature and specific conductance records are good, pH, and dissolved oxygen are fair, and turbidity record is poor.
For period 10/01/2016-09/30/2017: Continuous water temperature and specific conductance records are good, pH, and dissolved oxygen are fair, and turbidity record is poor.
For period 10/01/2017-09/30/2018: Continuous water temperature and specific conductance records are good, pH, and dissolved oxygen are fair, and turbidity record is poor.
For period 10/01/2019-09/30/2020: Continuous water temperature and specific conductance records are good, pH, and dissolved oxygen are fair, and turbidity record is poor.

Data for parameter code 63680 (turbidity) were collected using a probe with the following specifications: turbidity, water, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +/-2.5 degrees, FNU (Formazin Nephelometric Units). Hydrologic event 9 indicates a routine sample while J designates a storm event sample. Laboratory chemical analyses are by RTI Laboratory, Livonia, MI. Laboratory sediment analyses are by the U.S. Geological Survey, KY Sediment Laboratory. Field determinations of discharge, specific conductance, pH, water temperature, turbidity, barometric pressure, microbiology, air temperature, and dissolved oxygen are by the U.S. Geological Survey.

EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum recorded, 4250 microsiemens, January 22, 2018; Minimum recorded, 12 microsiemens, April 19, 2019.

pH: Maximum recorded, 7.3 units June 10, 2015, August 1, 2015, May 27, 2018, August 27, 2019; minimum recorded, 5.8 units, December 28, 2018.

WATER TEMPERATURE: Maximum recorded, 26.8°C, July 27, 2015; minimum recorded, 0.4°C, January 7, 30, 2014.

DISSOLVED OXYGEN: Maximum recorded, 13.6 mg/L, January 7-8, 24, 30, 2014; minimum recorded, 4.9 mg/L, September 28, 2019.

TURBIDITY: Maximum recorded, >1,100 FNU, August 8, 2014, May 17, 2015, December 24, 2015; minimum recorded, <0.5 FNU on many days.