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Water-Year Summary for Site 01089500

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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
00060 Discharge(Mean)  

Water year 2022: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2022
LOCATION - Lat 43°15'24", long 71°22'12" referenced to North American Datum of 1927, Merrimack County, NH, Hydrologic Unit 01070002,
DRAINAGE AREA - 157 mi².
PERIOD OF RECORD - Discharge records: May 1918 to September 1920, June 1921 to November 1927, November 1928 to September 1970, November 2007 to current year.
GAGE - Water-stage recorder and crest-stage gage. Concrete control since Sept. 14, 1937. Datum of gage is 328.78 ft above North American Vertical Datum of 1988.
COOPERATION - USGS Federal Priority Streamgage Program.
REMARKS - WATER YEARS 2014-2021: Records good except for estimated discharges, which are poor. Flow regulated at times by mills and reservoirs above station; regulation greater prior to 1949.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of May 15, 2006, reached a stage of 13.55 ft, from floodmarks, discharge, 7,600 ft³/s. Flood of April 17, 2007, reached a stage of 15.97 ft, from floodmarks, discharge, 10,600 ft³/s, based on contracted-opening measurements upstream and downstream of gage.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 12,900 ft³/s, March 19, 1936, from rating curve extended above 5,100 ft³/s based on slope-area and contracted-opening measurements at 15.27 ft, gage height 15.27, from floodmarks; minimum discharge, 0.40 ft³/s, September 4, 1926.