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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.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
01401750 MILLSTONE RIVER AT GRIGGSTOWN, NJ
LOCATION - Lat 40°26'24", long 74°37'03" referenced to North American Datum of 1983, Montgomery Township, Somerset County, NJ, Hydrologic Unit 02030105, on left bank, 300 ft downstream from bridge at Griggstown, 200 ft downstream from Simonson Brook, and 300 ft downstream from Griggstown Causeway.
DRAINAGE AREA - 229 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - Annual maximum, water years 1938, 1960-61, 1971, 1997, 1999 to current year. Miscellaneous measurements, water year 1969.
GAGE - Water-stage recorder with telemetry and crest-stage gage. Datum of gage is 26.52 ft above NGVD of 1929.
REMARKS - Diurnal fluctuations in gage height possibly due to flow pattern in sewage effluent that enter the river upstream of gage. Annual peak data can be obtained by selecting Peak streamflow from the 'Available data for this site' drop-down menu above or by using this link.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 24.21 ft, Aug 28, 2011.
