USGS Water-Year Summary for Site 01081500

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	00060 Discharge(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

01081500 MERRIMACK RIVER AT FRANKLIN JUNCTION, NH

LOCATION - Lat 43°25'22", long 71°39'12" referenced to North American Datum of 1927, Merrimack County, NH, Hydrologic Unit 01070002, on right bank at Franklin Junction, 1 mi downstream from confluence of Pemigewasset and Winnipesaukee Rivers, 1.5 mi south of Post Office in Franklin and 3.5 mi southwest of Town Hall in Tilton.

DRAINAGE AREA - 1,507 mi².

REVISIONS HISTORY - WSP 401: 1914. WSP 641: 1923(M). WSP 756: Drainage area. WSP 781: 1928(M). WSP 1231: 1911-13, 1916-17(M), 1919(M), 1922(M).

SURFACE-WATER RECORDS

PERIOD OF RECORD - Discharge: August 1903 to December 1903, April 1904 to September 1904, November 1904, April 1905 to September 1978, October 2001 to current year. Partial-record station: October 1978 to September 2001. Peak streamflow: Water years 1904 to 1978, 1983 to current year. Miscellaneous discharge measurements: Water years 1979 to 1984, 1990 to 2001. Water-quality records: Water years 1954-55.

GAGE - Water-stage recorder. Datum of gage is 250.58 ft above North American Vertical Datum of 1988. Prior to September 13, 1923, nonrecording gage at bridge 350 ft downstream at same datum.

COOPERATION - USGS Federal Priority Streamgage.

REMARKS -

WATER YEAR 2014: Records good except estimated daily discharges, which are fair.

WATER YEARS 2015-2022: Records good except for estimated discharges, which are poor.

Flow regulated by power plants, by Franklin Falls Reservoir (4 mi upstream) since 1942, and by Squam, Little Squam, Newfound, Winnipesaukee, Winnisquam, Wentworth, Merrymeeting, and other lakes and reservoirs in the Merrimack River basin.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 83,000 ft³/s, March 19, 1936, gage height 36.4 ft, from floodmarks, from rating curve extended above 30,000 ft³/s on basis of slope-area measurement and computation of flow over dam at gage height 29.5 ft and velocity-area study. Maximum discharge since construction of Franklin Falls Reservoir in 1942, 22,400 ft³/s, April 4, 1951, gage height 16.34 ft.