USGS Water-Year Summary 2021
01073000 OYSTER RIVER NEAR DURHAM, NH
LOCATION - Lat 43°08'55", long 70°57'56" referenced to North American Datum of 1927, Strafford County, NH, Hydrologic Unit 01060003, on left bank, 200 ft upstream from Old Concord Road bridge, 2.5 mi west of Durham, and 7 mi upstream from mouth.
DRAINAGE AREA - 12.1 mi².
PERIOD OF RECORD - Discharge records: October 1934 to current year. October and November 1934 monthly discharge only, published in WSP 1301.
GAGE - Water-stage recorder, crest-stage gage, and V-notch sharp-crested weir. Datum of gage is 64.58 ft above North American Vertical Datum of 1988. Concrete control prior to August 18, 2005, at site 150 ft upstream at datum 1.90 ft higher. Prior to October 1, 1964, at datum 2.90 ft higher.
COOPERATION - New Hampshire Department of Environmental Services.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 1,320 ft³/s, April 16, 2007, gage height, 10.20 ft; minimum discharge, 0.01 ft³/s, September 6 and 7, 1999.