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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
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USGS Water-Year Summary 2024
01118500 PAWCATUCK RIVER AT WESTERLY, RI
LOCATION - Lat 41°23'01", long 71°50'01" referenced to North American Datum of 1927, Washington County, RI, Hydrologic Unit 01090005, on left bank at Westerly, 2.1 mi downstream from Shunock River. Use coordinates 41°22'59.80"N, 71°49'57.86"W to get to parking area.
DRAINAGE AREA - 295 mi².
REVISIONS HISTORY - WSP 1051: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge: November 1940 to current year. Water-quality records: Water years 1953, 1963, 1968, 1971-72, 1974-2002, and 2007 to current year.
GAGE - Data Collection Platform with satellite telemeter. Datum of gage is 2.70 ft below NAVD 1988. From April 16, 2020, through May 7, 2020, datum erroneously published as 0.81 ft above NAVD 1988. Prior to April 16, 2020, datum reported as 2.68 ft below NAVD 1988; 1.76 ft below NGVD 1929.
COOPERATION - Rhode Island Water Resources Board.
REMARKS - Records good except those for estimated daily discharge, which are poor. Many days are adjusted for tidal backwater, which lasts as much as 4 hours during times of high tide. Diurnal fluctuation at low flow prior to 1962 by mills upstream; regulation much greater prior to 1958. Diversion upstream for municipal supply of Westerly.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
WATER TEMPERATURE: Maximum, 29.8°C on Jul. 28, 2020; minimum, 0.2°C on Jan. 22, 2020. SPECIFIC CONDUCTANCE: Maximum, 168 microsiemens/cm August 21, 2020; minimum 75 microsiemens/cm December 15, 2019. DISSOLVED OXYGEN: Maximum, 14.2 mg/L Jan. 22, 2020; minimum, 5.3 mg/L Aug. 13, 2020. pH: Maximum, 8.3 units Aug. 11, 2020, minimum, 5.6 units Dec. 16, 2019. TURBIDITY: Maximum, 49 FNU July 23, 2019, minimum, 0.2 FNU Aug 12, 2020. CHLOROPHYLL: Maximum, 24.7 RFU Apr 24, 2019; minimum, 0.1 RFU on several days during the period of record.
INSTRUMENTATION - Miscellaneous water-quality measurements, water years 1953, 1963, 1968, 1971-72, 1974-2002, and 2007 to current year.
REMARKS - Water-quality data are not rated.
