Funding for this site is provided by:
41°39'06.3", long 73°56'37.4" referenced to North
American Datum of 1983, Dutchess County, NY, Hydrologic Unit 02020008,
on left bank at IBM pumping station, 2.3 mi south of Poughkeepsie, and
3.5 mi south of the Mid-Hudson bridge.
PERIOD OF RECORD.--
March 2002 to current year. Daily elevations
published since May 1992. Occasional miscellaneous discharge
measurements, water year 2001.
WDR NY-97-1: 1996.
Water-stage recorder and acoustic velocity meter. Datum
of gage is NGVD of 1929. To convert elevations to NAVD of 1988,
subtract 0.88 ft.
Flow at this site is affected by astronomical tides.
Prior to September 2012, discharge computed with an uplooking acoustic
velocity meter. Since September 2012, discharge computed with a
sidelooking acoustic velocity meter. Blanks in discharge tables, July
to October 2002 and July to October 2007, are the result of the salt
front adversely affecting measured velocity. All other blanks in
discharge tables are due to interruption of record. Prior to October
2002, elevation published as maximum, minimum, and mean elevation.
Elevations are not corrected for changes in water density. Blanks in
elevation tables are the result of only one high or low tide during a
day or interruption of record. Water Years 2014-18: Records fair except
those for estimated daily discharge, which are poor.
EXTREMES FOR PERIOD OF RECORD.--
Maximum daily discharge, 240,000
ft³/s, Aug. 29, 2011; maximum elevation recorded, 9.54 ft, Oct. 29,
2012, but may have been higher during period of instrument malfunction,
outside elevation was 9.28 ft, from floodmarks; minimum daily
discharge, -24,900 ft³/s, Oct. 14, 2003, but may have been lower during
period of missing record; minimum elevation, -4.38 ft, Mar. 14, 15,
PERIOD OF DAILY RECORD1.--
SPECIFIC CONDUCTANCE: May
1992 to current year.
WATER TEMPERATURE: May 1992 to current year.
specific-conductance satellite and telephone telemeter provides
Temperature readings prior to Oct. 1,
2007, rounded to the nearest 0.5 °C. Specific conductance occasionally
affected by local runoff. Interruption of record was due to malfunction
of recording instrument.
EXTREMES FOR PERIOD OF DAILY RECORD1.--
CONDUCTANCE: Maximum, 2,900 Ã¬S/cm at 25 °C, Sept. 8, 2002; minimum, 96
Ã¬S/cm at 25 °C, Jan. 30, 1995.
WATER TEMPERATURE: Prior to Oct. 1, 2007--Maximum, 29.0 °C, Aug. 14,
2005; minimum, 0.0 °C on many days during winter periods, except
WATER TEMPERATURE: After Oct. 1, 2007--Maximum, 28.6 °C, Aug. 13, 14,
2016; minimum, -0.2 °C, Feb. 6, 7, 2010, several days during February
2011 and 2014 winter period.
1 Water-Quality Records
Peak Flow and Stage Information
NAVD 1988 Datum Conversion Information
Hudson River Sediment Flux Project
Hudson River Salt-Front information.