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USGS Water-Year Summary 2024
01092000 MERRIMACK RIVER NEAR GOFFS FALLS, BELOW MANCHESTER, NH
LOCATION - Lat 42°56'53", long 71°27'50" referenced to North American Datum of 1927, Hillsborough County, NH, Hydrologic Unit 01070002, on right bank, 600 ft upstream from bridge on Interstate Highway 293, 0.8 mi downstream from Bowman Brook, 1.3 mi north of Goffs Falls, 2.2 mi downstream from Piscataquog River, and 3.0 mi south of Manchester City Hall on Elm Street.
DRAINAGE AREA - 3,092 mi².
REVISIONS HISTORY - WSP 1231: 1937. WSP 1271: 1937(M, m).
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge records: October 1936 to current year. October 1936 monthly discharge only, published in WSP 1301.
GAGE - Water-stage recorder. Datum of gage is 108.58 ft above North American Vertical Datum of 1988.
REMARKS - WATER YEARS 2014-22: Records good except those for estimated discharges, which are poor. Flow regulated by power plants, by Franklin Falls Reservoir since 1942, and by Squam, Newfound, Winnipesaukee, Winnisquam, and other lakes and reservoirs upstream.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge since at least 1722, 150,000 ft³/s, March 20, 1936, gage height, 35.19 ft, from floodmarks, from rating curve extended above 48,000 ft³/s on basis of computation of flow over dam at gage heights 25.87 ft and 35.19 ft.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 102,000 ft³/s, Sep. 23, 1938, gage height 25.87 ft, from rating curve extended above 48,000 ft³/s on basis of computation of flow over dam at gage heights 25.87 ft and 35.19 ft.
