USGS Water-Year Summary for Site 01104430

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00020 Temperature, air(Max.,Min.,Mean)
	00045 Precipitation(Sum)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Mean)
	00095 Specific cond at 25C(Min.)
	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

01104430 HOBBS BROOK BELOW CAMBRIDGE RESERVOIR NEAR KENDALL GREEN, MA

LOCATION - Lat 42°23'53", long 71°16'26" referenced to North American Datum of 1927, Middlesex County, MA, Hydrologic Unit 01090001, 50 ft downstream from culvert on Winter Street, 300 ft downstream from gate house outlet from Cambridge Reservoir, and 1.3 mi north of Kendall Green.

DRAINAGE AREA - 6.86 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - DISCHARGE: July 1997 to current year. RESERVOIR ELEVATION: October 1999 to current year. RESERVOIR STORAGE: November 2000 to current year.

GAGE - Data Collection Platform with telephone telemeter. Elevation of streamgage is 149.20 ft above North American Vertical Datum of 1988, estimated from topographic map. Datum of streamgage previously reported as 150 ft above NGVD 1929, estimated from topographic map. Datum of reservoir gage is referenced to the City of Cambridge datum. Subtract 10.84 ft to convert to elevation above NGVD 1929. Subract 11.70 ft to convert to elevation above NAVD 1988.

COOPERATION - Cambridge Water Department.

REMARKS - Records fair except those for flows less than 1.0 cfs, and those for estimated daily discharges, which are poor. Flow affected by regulation from dam, 300 ft upstream at outflow of Cambridge Reservoir.

EXTREMES FOR PERIOD OF RECORD - RESERVOIR ELEVATION: Maximum recorded, 184.41 ft, Mar. 15, 2010; minimum, 169.78 ft, Nov. 10, 2002. RESERVOIR STORAGE: Maximum recorded, 3,141 Mgal, Mar. 15, 2010; minimum, 771 Mgal, Nov. 12, 2002. 2015 WATER-YEAR SUMMARY (min/max info): Maximum instantaneous reservoir storage and corresponding reservoir elevation are 2546 Mgal and 181.46 ft on May 8, 11-13, 2015. Minimum instantaneous reservoir storage and corresponding reservoir elevation are 1202 Mgal and 173.26 ft on Sept 29 and 30, 2015.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - PRECIPITATION: October 2001 to current year. AIR TEMPERATURE: October 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 - AIR TEMPERATURE: Maximum recorded, 35.7 °C, July 6, 2010; minimum, -24.1 °C, Feb. 24, 2015.

REMARKS - Records are not rated. Daily precipitation totals for periods of missing records were estimated from nearby stations.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: July 1997 to current year. WATER TEMPERATURE: July 1997 to current year.

INSTRUMENTATION - Specific conductance and water-temperature water-quality monitor.

REMARKS -

2019 WATER-YEAR SUMMARY (min/max info):

WATER TEMPERATURE: Maximum instantaneous water temperature: 25.2 °C on Aug. 14, 2019; Minimum instantaneous water temperature: 2.0 °C on Jan. 14, 2019.

SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 1,060 µS/cm on Mar. 19, 2019; Minimum instantaneous specific conductance: 815 µS/cm on Mar. 22, 2019.

2018 WATER-YEAR SUMMARY (min/max info):

WATER TEMPERATURE: Maximum instantaneous water temperature: 29.2 °C on Aug. 02, 2018; Minimum instantaneous water temperature: 0.1 °C on Jan. 13, 2018 and other days throughout winter.

SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 24,500 µS/cm on Dec. 23, 2017; Minimum instantaneous specific conductance: 32 µS/cm on Sept. 18, 2018.

2017 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 25.7 °C on Jul. 04, 2017; Minimum instantaneous water temperature: 0.9 °C on Feb. 09, 2017 and other days in winter. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 2,030 µS/cm on Apr. 01, 2017. Minimum instantaneous specific conductance: 512 µS/cm on Nov. 30, 2016. Records good for water temperature rated as excellent. Records good for specific conductance are rated as excellent, except for the following daily ranges: 2016/10/01 through 2016/10/19, 2017/02/02 through 2017/02/07, 2017/04/02, 2017/04/03, 2017/04/08 through 2017/04/12, 2017/06/18, 2017/06/19, 2017/06/22, 2017/07/30 through 2017/08/01 which are rated good.

2016 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 27.6 °C on Aug. 15, 2016; Minimum instantaneous water temperature: 1.0 °C on Feb. 12, 2016. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 1,120 µS/cm on Sept. 22, 2016 and other days in September; Minimum instantaneous specific conductance: 473 µS/cm on Dec. 23, 2015. Records good for water temperature rated as excellent. Records good for specific conductance are rated as excellent, except for the following daily ranges: 2015/10/01 to 2015/10/08, 2015/10/20 to 2015/12/03, 2015/12/17 to 2016/01/29, 2016/06/06 to 2016/06/11, 2016/06/15 to 2016/06/23, 2016/07/25 to 2016/08/15, and 2016/09/13 to 2016/09/30 which are rated good; and 2016/01/30 to 2016/02/03 and 2016/04/06 to 2016/04/07 which are rated fair.

2015 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 26.2 °C on Sept. 3, 2015; Minimum instantaneous water temperature: 1.9 °C on Dec. 20, 2014. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 1,140 µS/cm on Apr. 11, 2015; Minimum instantaneous specific conductance: 485 µS/cm on Dec. 09, 2014. Records good for water temperature rated as excellent. Records good for specific conductance are rated as excellent, except for the following daily ranges: 2014/10/01 to 2014/10/05, 2014/10/08, 2014/10/23 to 2014/11/07, 2015/03/08 to 2015/03/10, 2015/03/30 to 2015/04/13, 2015/07/26 to 2015/08/24, and 2015/09/09 to 2015/10/08 which are good; 2014/10/09 to 2014/10/20 and 2014/11/08 to 2014/11/30 which are fair; and 2014/10/06 to 2014/10/07, 2014/12/01 to 2014/12/03, 2015/04/14 to 15/06/22, and 2015/08/25 to 2015/08/28 which are poor.

2014 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 25.2 °C on Jul. 24, 2014; Minimum instantaneous water temperature: 1.6 °C on Jan. 03, 2014. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 1,270 µS/cm on Mar. 24, 2014; Minimum instantaneous specific conductance: 684 µS/cm on Dec. 29, 2013. 2

2013 WATER-YEAR SUMMARY (min/max info): WATER TEMPERATURE: Maximum instantaneous water temperature: 24.6 °C on Jul. 31, 2013; Minimum instantaneous water temperature: 1.1 °C on Dec. 30, 2012. SPECIFIC CONDUCTANCE: Maximum instantaneous specific conductance: 770 µS/cm on Jun. 06, 2013; Minimum instantaneous specific conductance: 604 µS/cm on Dec. 27, 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, 2,030 uS/cm, Apr. 01, 2017; minimum, 163 uS/cm, Nov. 26, 2000. WATER TEMPERATURE: Maximum recorded, 27.6 °C, July 18, 2012; minimum, 0.2 °C, Jan. 18, 2001.