USGS Water-Year Summary for Site 01104460

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

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

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USGS Water-Year Summary 2024

01104460 STONY BROOK AT ROUTE 20 AT WALTHAM, MA

LOCATION - Lat 42°22'08", long 71°16'16" referenced to North American Datum of 1927, Middlesex County, MA, Hydrologic Unit 01090001, 200 ft downstream of State Highway 20, 1,000 ft upstream from Stony Brook Reservoir, and 1.8 mi west of Waltham.

DRAINAGE AREA - 22 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1997 to September 1998, August 2002 to current year.

GAGE - Data Collection Platform with telephone telemeter. Datum of gage is 89 ft above NAVD 1988, estimated from topographic map. Datum of gage previously reported as 90 ft above NGVD 1929, estimated from topographic map.

COOPERATION - Cambridge Water Department.

REMARKS - Records good except those for estimated daily discharge, which are poor. Flows are partially regulated by Cambridge Reservoir.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: October 1997 to September 1998, August 2002 to current year. WATER TEMPERATURE: October 1997 to September 1998, August 2002 to current year.

INSTRUMENTATION - Specific conductance and water-temperature monitor.

REMARKS -

2019 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 26.3 °C on Jul. 21; Minimum instantaneous water temperature: 0.1 °C on Jan. 11, 2019.
SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 1430 µS/cm on Mar. 10, 2019; Minimum instantaneous specific conductance: 364 µS/cm on Nov. 04, 2018.

2018 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 27.0 °C on Jul. 05, 2018 and other days; Minimum instantaneous water temperature: -0.1 °C on Jan 04, 2018 and others.
SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 3020 µS/cm on Dec. 23, 2017; Minimum instantaneous specific conductance: 359 µS/cm on Dec. 06, 2017.

2017 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 25.2 °C on Jul. 21, 2017 and other days; Minimum instantaneous water temperature: 0.0 °C on Mar. 5, 2017 and others.
SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 4,290 µS/cm on Dec. 12, 2016; Minimum instantaneous specific conductance: 58 µS/cm on Oct. 21, 2016.

2016 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 27.3 °C on Jul. 27, 2016 and Aug. 14, 2016 (new extreme for period of record); Minimum instantaneous water temperature: 0.3 °C on Feb. 14, 2016. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 3,360 µS/cm on Feb. 16, 2016; Minimum instantaneous specific conductance: 398 µS/cm on Jan. 12, 2016. Records for water temperature are rated as excellent. Records for specific conductance are rated as excellent, except for the following daily ranges: 2015/11/20, 2015/12/03 to 2016/01/09, 2016/05/02, 2016/05/30, 2016/06/17 to 2016/07/03, 2016/07/05, 2016/07/08 to 2016/07/12, 2016/07/18 to 2016/09/12, and 2016/09/14 to 2016/09/30 which are rated good; 2016/01/10 to 2016/02/01, 2016/07/04, 2016/07/06 to 2016/07/07, and 2016/07/13 to 2016/07/17 which are rate fair; and 2016/09/13, 2016/04/02 to 2016/04/03, and 2016/04/11 to 2016/04/13 which are rated poor.

2015 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 26.6 °C on Aug. 17, 2015; Minimum instantaneous water temperature: 0.0 °C on Feb. 13, 2015 and many other days throughout February. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 1,160 µS/cm on Nov. 26, 2014; Minimum instantaneous specific conductance: 200 µS/cm on Sept. 30, 2015. Records for water temperature are rated as excellent. Records for specific conductance are rated as excellent, except for the following daily ranges: 2014/11/26 to 2014/11/27, 2014/11/30 to 2014/12/11, 2014/12/20 to 2015/02/05, and 2015/07/30 to 2015/08/12 which are rated as good; 2015/02/06 to 2015/03/06 and 2015/07/18 to 2015/07/19 which are rated as fair; and 2015/03/07 to 2015/04/06 and 2015/04/09 to 2015/05/21 which are rated as poor.

2014 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 25.7 °C on Jul. 23, 2014; Minimum instantaneous water temperature: 0.1 °C on Feb. 13, 2014. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 2,920 µS/cm on Feb. 14, 2014; Minimum instantaneous specific conductance: 257 µS/cm on Mar. 31, 2014.

2013 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 25.2 °C on Jul. 05, 2013; Minimum instantaneous water temperature: 0.1 °C on Feb. 08 and 09, 2013. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 2,030 µS/cm on Feb. 19, 2013; Minimum instantaneous specific conductance: 158 µS/cm on Dec. 28, 2012.

2012 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 26.8 °C on Jul. 17, 2012 (new extreme for period of record); Minimum instantaneous water temperature: 0.0 °C on Jan. 15 and 16, 2012. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 1,680 µS/cm on Mar. 01, 2012; Minimum instantaneous specific conductance: 178 µS/cm on Jun. 02, 2012.

Record quality is described in the following publication: Wagner, R.J., Boulger, R.W., Jr., Oblinger, C.J., and Smith, B.A., 2006, Guidelines and standard procedures for continuous water-quality monitors—Station operation, record computation, and data reporting: U.S. Geological Survey Techniques and Methods 1–D3, 51 p. + 8 attachments; accessed April 10, 2006, at http://pubs.water.usgs.gov/tm1d3

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum recorded, 4,290 µS/cm on Dec. 12, 2016; minimum, 45 uS/cm, June 15, 1998. WATER TEMPERATURE: Maximum recorded, 27.3 °C, July 27, 2016; minimum, -0.7 °C (rated as fair), Dec. 13 and 16, 2007.