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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.
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USGS Water-Year Summary 2024
01076500 PEMIGEWASSET RIVER AT PLYMOUTH, NH
LOCATION - Lat 43°45'33", long 71°41'10" referenced to North American Datum of 1927, Grafton County, NH, Hydrologic Unit 01070001, on right bank, 200 ft downstream from Holderness Road bridge in Plymouth, 0.1 mi northeast of Plymouth Town Hall, and 0.3 mi downstream from Baker River.
DRAINAGE AREA - 622 mi².
REVISIONS HISTORY - WSP 471: 1912-14. WSP 726: Drainage area. WSP 1231: 1904-11, 1913-14, 1917-18, 1919(M), 1920-25, 1926-27(M),
1929-31(M). WSP 1721: 1959(M). See also PERIOD OF RECORD.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge records: October 1903 to current year. Records for April 1886 to September 1903, published in WSP
124, are unreliable and should not be used.
GAGE - Water-stage recorder. Datum of gage is 456.66 ft above North American Vertical Datum of 1988. Prior to January 1, 1910, nonrecording gage at sites 150 ft and 200 ft upstream at present datum or datum 1.11 ft lower. January 1, 1910 to September 30, 1926, nonrecording gage at site 200 ft upstream at present datum.
COOPERATION - USGS Federal Priority Streamgage Program.
REMARKS - WATER YEARS 2014-16 and 2018-24: Records good except those for estimated discharges, which are poor. WATER YEAR 2017: Records fair except those for estimated discharges, which are poor. Stage-discharge relationship at times is affected by variable slope. Some diurnal fluctuation during period 1940-52 caused by power plants upstream.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 65,400 ft³/s, March 19, 1936, gage height 29.00 ft, from floodmarks; minimum discharge, 39 ft³/s, October 1 and 3, 1948.
