USGS Water-Year Summary for Site 01201487

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

01201487 STILL RIVER AT RT 7 AT BROOKFIELD CENTER, CT

LOCATION - Lat 41°27'56.96", long 73°24'11.53" referenced to North American Datum of 1983, Fairfield County, CT, Hydrologic Unit 01100005, on bridge on upstream side of State Rt. 7 South, 800 ft upstream from Silvermine Rd.

DRAINAGE AREA - 62.3 mi².

REVISIONS HISTORY - WDR CT-06-1: 2005 (P).

SURFACE-WATER RECORDS

PERIOD OF RECORD - Discharge: November 2001 to current year; February 1993 to October 2001 (gage heights and discharge measurements only).

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 255.24 ft above North American Vertical Datum of 1988 (256.18 ft above National Geodetic Vertical Datum of 1929). Satellite telemetry at station.

REMARKS -

Water Year 2020: Records good except for periods of estimated discharges, which are poor.

Water Year 2019: Records good except for the period from Oct. 2, 2018 to Oct. 22, 2018, which is fair and estimated discharges, which are poor.

Water Years 2017-2018: Records good except for periods of estimated discharges, which are poor.

Water Years 2014-2016: Records good except for periods of estimated discharges, which are fair.

EXTREMES FOR PERIOD OF RECORD - Minimum instantaneous discharge was 10.7 ft³/s (estimated) on July 14, 2018.

WATER-QUALITY RECORDS

PERIOD OF RECORD - October 1983 to current year.

PERIOD OF DAILY RECORD -

--Water Temperature: October 2013 to April 2016, (seasonal deployment April 2016 to September 2018), February 2020 to April 2023.

--Specific Conductance: October 2013 to April 2016, (seasonal deployment April 2016 to September 2018) February 2020 to April 2023.

--pH, (Seasonal deployment, June 2016 to September 2018), February 2020 to April 2023.

--Dissolved Oxygen, June 2015 to November 2016, (seasonal deployment, June 2017 to September 2018) February 2020 to April 2023.

--Turbidity October 2013 to April 2016, February 2020 to April 2023.

--Chlorophyll RFU, February 2020 to April 2023.

INSTRUMENTATION -

--Multiparameter sonde: Continuous monitoring, October 2013 to April 2016, February 2020 to April 2023; Seasonal operation, April 2016 to September 2018
--Turbidity sensor: October 2013 to September 2018, February 2020 to April 2023.

--PAR sensor August 2015 to September 2022.

REMARKS - Water years 1984 to 1992, published under station 01201485.

EXTREMES FOR PERIOD OF DAILY RECORD -

--WATER TEMPERATURE: Maximum, 29.0°C June 30, 2021; minimum, -0.3°C Feb. 03, 2018.
--SPECIFIC CONDUCTANCE @25 °C: Maximum, 3,211 µS/cm, Mar. 04, 2015; minimum, 98 µS/cm, Sep 02, 2021.
--DISSOLVED OXYGEN: Maximum, 16.2 mg/l, Feb. 12, 2021 and Mar. 08, 2020; minimum, 3.3 mg/l, June 19, 2018.
--pH: Maximum, 8.9 standard units, Sept. 29-30, Oct. 02 and 15, 2016; minimum, 7.0 standard units July 17, 2017.
--TURBIDITY: Maximum, 230 FNU, Mar. 30, 2014; minimum, 0 FNU, Oct. 27, 2015.
--CHLOROPHYLL: Maximum, 80.0 RFU, Feb. 27, 2020; minimum, -0.01 RFU, Jan. 16, 2021.