USGS Water-Year Summary for Site 01104480

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	Available Parameters
	00010 Temperature, water(Mean)
	00020 Temperature, air(Mean)
	00045 Precipitation(Sum)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Mean)
	72022 Reservoir storage(Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

01104480 STONY BROOK RESERVOIR AT DAM NEAR WALTHAM, MA

LOCATION - Lat 42°21'20", long 71°15'56" referenced to North American Datum of 1927, Middlesex County, MA, Hydrologic Unit 01090001, 10 ft upstream from bridge on River Road, 300 ft downstream from gate house outlet for Stony Brook Reservoir, and 2.0 mi southwest of Waltham.

DRAINAGE AREA - 23.7 mi².

REVISIONS HISTORY - Annual peak discharges for water years 2000 - 2008.

SURFACE-WATER RECORDS

PERIOD OF RECORD - DISCHARGE: August 1999 to current year. RESERVOIR ELEVATION: March 2001 to current year. RESERVOIR STORAGE: March 2001 to current year.

GAGE - Data Collection Platform with telephone telemeter. Datum of streamgage 42.14 ft above NAVD 1988, estimated from topographic map. Previously reported as 43 ft above NGVD 1929, from topographic map. Datum of reservoir gage is 80.30 ft, referenced to the City of Cambridge datum. Subtract 10.84 ft to convert to elevation above NGVD 1929. Subtract 11.70 ft to convert to elevation above NAVD 1988.

COOPERATION - Cambridge Water Department.

REMARKS - Discharge records good except those for estimated daily discharges and discharges less than 1.0 cfs, which are poor. Records for daily mean reservoir elevation good except those for missing records, which are not rated and not estimated. Records for daily mean reservoir storage are fair except those for estimated daily mean reservoir storage, which are poor. Flow affected by withdrawal for municipal water supply for Cambridge and regulation of dam, 300 ft upstream at outflow of Stony Brook Reservoir.

Note: No flow during many days throughout the period of record from controlled shutdowns.

EXTREMES FOR PERIOD OF RECORD -

RESERVOIR ELEVATION: Maximum recorded: 82.25 ft, Mar. 15, 2010; minimum, 62.60 ft, (based on manual measurement when reservoir elevation was below sensor), Sept. 16, 2002. RESERVOIR STORAGE: Maximum recorded: 463 Mgal, Mar. 15, 2010; minimum, less than 91 Mgal (estimated), Sept. 16, 2002.

EXTREMES FOR 2018 WATER YEAR: RESERVOIR ELEVATION: Maximum recorded: 81.28 ft, Apr. 17 ,2018 ; minimum, 70.82 ft, Dec. 19, 2017. RESERVOIR STORAGE: Maximum recorded: 425 Mgal, Apr. 17 ,2018 ; minimum, 194 Mgal, Dec. 19, 2017.

EXTREMES FOR 2017 WATER YEAR: RESERVOIR ELEVATION: Maximum recorded: 81.33 ft, Feb. 25, 2017; minimum, 74.36 ft, Oct. 09, 2016. RESERVOIR STORAGE: Maximum recorded: 426 Mgal, Feb. 25, 2017; minimum, 267 Mgal, Oct. 09, 2016..

EXTREMES FOR 2016 WATER YEAR: RESERVOIR ELEVATION: Maximum recorded: 80.48 ft, Mar. 16, 2016; minimum, 74.57 ft, Sept. 30, 2016. RESERVOIR STORAGE: Maximum recorded: 422 Mgal, Mar. 16, 2014; minimum, 287 Mgal, Sept. 30, 2016.

EXTREMES FOR 2015 WATER YEAR: RESERVOIR ELEVATION: Maximum recorded: 80.33 ft, Dec. 5, 2014; minimum, 76.10 ft, Dec. 25, 2014. RESERVOIR STORAGE: Maximum recorded: 419 Mgal, Dec. 4-5, 2014; minimum, 321 Mgal, Dec. 25, 2014.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - PRECIPITATION: November 2001 to current year. AIR TEMPERATURE: November 2001 to current year.

INSTRUMENTATION - Heated tipping-bucket precipitation gage with wind shield and air-temperature sensor with radiation shield.

EXTREMES FOR PERIOD OF RECORD -

2018 WATER-YEAR SUMMARY for air temperature (min/max info): Maximum instantaneous air temperature: 34.4 C on July 01, 2018; Minimum instantaneous air temperature: -20.3 C on Jan. 02, 2018.

2017 WATER-YEAR SUMMARY for air temperature (min/max info): Maximum instantaneous air temperature: 34.5 C on May 18, 2017; Minimum instantaneous air temperature: -15.7 C on Jan. 09, 2017.

2016 WATER-YEAR SUMMARY for air temperature (min/max info): Maximum instantaneous air temperature: 34.4 C on July 22, 2016 Minimum instantaneous air temperature: -23.3 C on Feb. 04, 2016

2015 WATER-YEAR SUMMARY for air temperature (min/max info): Maximum instantaneous air temperature: 33.8 C on Sept. 09, 2015 Minimum instantaneous air temperature: -22.9 C on Feb. 14, 2015

REMARKS - Records are not rated.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Reservoir measurements for October 1999 to January 2000 and October 2001 to November 2003; tail water measurements for May 2008 to October 18, 2016. WATER TEMPERATURE: Reservoir measurements for October 1999 to January 2000, February 2001 to April 2002, tail water measurements for May 2008 to October 18, 2016.

REMARKS - 2016 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 30.9 °C on Jul. 27, 2016; Minimum instantaneous water temperature: 0.4 °C on Jan. 20, 2016. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 1,230 µS/cm on Jul. 27, 2016 (new extreme for period of record); Minimum instantaneous specific conductance: 572 µS/cm on Jan. 16, 2016, Mar. 22, 2016, and Mar. 29, 2016. 2015 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 32.4 °C on Jul. 20, 2015; Minimum instantaneous water temperature: 0.0 °C on Feb. 28, 2015 and many days throughout winter. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 1,160 µS/cm on Jul. 29, 2015 (new extreme for period of record); Minimum instantaneous specific conductance: 396 µS/cm on Dec. 17, 2014. 2014 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 32.0 °C on Jul. 03, 2014; Minimum instantaneous water temperature: 0.0 °C on Nov. 24 and 25, 2013 (new extreme for period of record). SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 981 µS/cm on Jul. 03, 2014; Minimum instantaneous specific conductance: 458 µS/cm on Nov. 27, 2013. 2013 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 32.7 °C on Jul. 19, 2013 (new extreme for period of record); Minimum instantaneous water temperature: 0.4 °C on Jan. 01 and 02, 2013. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 770 µS/cm on Jul. 19, 2013; Minimum instantaneous specific conductance: 351 µS/cm on Jan. 04, 2013. 2012 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 31.3 °C on June 22, 2012 (new extreme for period of record); Minimum instantaneous water temperature: 0.0 °C on Jan. 18, 2012. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 754 µS/cm on July 17, 2012; Minimum instantaneous specific conductance: 356 µS/cm on Dec. 13, 2011.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum recorded, 1,230 µS/cm on Jul. 27, 2016; minimum, 250 uS/cm, Dec. 7, 1999. WATER TEMPERATURE: Maximum recorded, 32.7 °C, July 19, 2013; minimum, 0.0 °C, Nov. 24, 2013.