USGS Water-Year Summary 2017
01073500 LAMPREY RIVER NEAR NEWMARKET, NH
LOCATION - Lat 43°06'09", long 70°57'11" referenced to North American Datum of 1927, Strafford County, NH, Hydrologic Unit 01060003, on right bank, 200 ft upstream from Packers Falls and Packer Falls Road, 1.8 mi northwest of Newmarket Town Hall, 2.6 mi southwest of Durham, and 4.6 mi upstream from mouth.
DRAINAGE AREA - 185 mi². from automated delineation using 30-meter National Elevation Dataset digital elevation model data and Watershed Boundary Dataset, accessed December 6, 2012 at http://water.usgs.gov/osw/streamstats/.
REVISIONS HISTORY - WSP 1231: 1936-37. WDR NH-VT-97-1: 1997 (datum correction). WDR 2012: Drainage Area.
PERIOD OF RECORD - Discharge records: July 1934 to current year. Water-quality records: Water year 1954.
GAGE - Water-stage recorder. Datum of gage is 38.28 ft above National Geodetic Vertical Datum of 1929.
COOPERATION - New Hampshire Department of Environmental Services and USGS Groundwater and Streamflow Information Program.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 8,970 ft³/s, May 16, 2006, gage height 18.31 ft (from floodmarks); minimum daily discharge, 0.66 ft³/s, July 27, 1994, during refilling after repairs at Wiswall Dam.