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Water-Year Summary for Site 01103050

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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.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00065 Gage height(Mean)  
62623 Tide stage(Max.,Min.,Mean)  

Water year 2021: 2020-10-01 to 2021-09-30

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USGS Water-Year Summary 2021
LOCATION - Lat 42°23'44", long 71°04'32" referenced to North American Datum of 1927, Middlesex County, MA, Hydrologic Unit 01090001, on right bank upstream of Lock 2, at Amelia Earhart Dam, 1.2 mi northeast of Somerville.
DRAINAGE AREA - 62.7 mi².
REVISIONS HISTORY - Boston Harbor stage records from June 12, 2011 to Feb. 7, 2012 are deleted.
Mystic River Stage: December 2007 to current year. Boston Harbor Tide Stage: February 2012 to current year.
GAGE - Water-stage recorder with GOES telemetry. Datum of gage is MDC (Metropolitan District Commission) Base. Subtract 106.68 ft to adjust gage height to elevation of North American Vertical Datum of 1988.
COOPERATION - Massachusetts Department of Conservation and Recreation, Division of Planning and Engineering.
REMARKS - Records are good. Periods of missing record are not estimated. Frequent stage fluctuations are due to gate changes, lock operations, and pumping when necessary, at the Amelia Earhart Dam.
EXTREMES FOR PERIOD OF RECORD - Mystic River: Maximum gage height, 107.61 ft, Aug. 25, 2010. Minimum gage height, 102.17 ft, Mar. 9, 2008.

Boston Harbor: Maximum gage height, 115.13 ft, Jan. 2, 2010. Minimum gage height, 97.67 ft, Feb, 20, 2015.