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USGS Water-Year Summary 2024
01463500 DELAWARE RIVER AT TRENTON, NJ
LOCATION - Lat 40°13'18", long 74°46'41" referenced to North American Datum of 1983, Trenton City, Mercer County, NJ, Hydrologic Unit 02040105, on left bank 450 ft upstream from Calhoun Street Bridge at Trenton, 0.5 mi upstream from Assunpink Creek, 0.9 mi north of Morrisville, PA, and at river mile 134.5.
DRAINAGE AREA - 6,780 mi².
REVISIONS HISTORY - WSP 951: Drainage area. WSP 1302: 1913-20. WSP 1382: 1924, 1928.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Continuous-record discharge station, February 1913 to current year. October 1912 to February 1913 monthly discharge only, published in WSP 1302. Gage-height records collected in this vicinity since 1904 are contained in reports of the National Weather Service. Peak discharges recorded at Lambertville, NJ, 14.3 mi upstream of bridge on Calhoun Street for water years 1898 to 1906.
GAGE - Water-stage recorder with telemetry. Datum of gage is 1.08 ft below NAVD of 1988. Prior to Sep 30, 1965, at datum 7.77 ft higher. Feb 24, 1913 to Oct 2, 1928, non-recording gage on downstream side of highway bridge at site 450 ft downstream.
REMARKS - Records good, except for estimated discharges, which are fair. Diurnal fluctuations at medium and low flow caused by power plants on tributary streams. Flow regulated by Lakes Wallenpaupack and Hopatcong (see 01455400), and by Pepacton, Cannonsville, Neversink Reservoirs and many smaller reservoirs. Diversion from Pepacton, Cannonsville, and Neversink Reservoirs. Diversion to Bradshaw and Merrill Creek Reservoirs and to Delaware and Raritan Canal (see 01460440). Water diverted just above station by Borough of Morrisville, PA and City of Trenton for municipal supply. Minor tide effect may occur.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Oct 11, 1903 reached an elevation of about 28.5 ft above NGVD of 1929, discharge, estimated at 295,000 ft³/s. Maximum elevation known, 30.6 ft above NGVD of 1929, Mar 8, 1904, from floodmark, due to ice jam.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 329,000 ft³/s, Aug 20, 1955, maximum flow since 1692, gage height, 28.60 ft, from high-water mark in gage house, current datum, from rating curve extended above 230,000 ft³/s, on basis of flood-routing study; minimum discharge, 1,180 ft³/s, Oct 31, 1963.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water-quality recorder located at Morrisville Water Filtration Plant on right bank, approximately 1900 ft upstream from Calhoun Street Bridge, 1995 - current. Recorder located inside Trenton Water Filtration Plant on left bank, approximately 650 ft upstream of the Calhoun Street bridge, Jun 1968 to Aug 1975, May 1979 to Oct 1995. Recorder located outside Trenton Water Filtration Plant on left bank, approximately 400 ft upstream of Calhoun Street bridge, Nov 1975 to Jan 1979.
CONTINUOUS DATA:
Chlorophylls, February 2017 to current year.
Dissolved nitrate plus nitrite, January 2018 to current year.
Dissolved oxygen, October 1962 to current year (recorded once daily during 1979).
Dissolved Oxygen (Percent of Saturation), October 2001 to current year.
pH, June 1968 to current year (recorded as once daily during 1979).
Specific Conductance, October 1963 to current year (recorded as once daily during years 1964 to 1968, 1979).
Suspended Sediment Concentration, September 1949 to March 1982.
Suspended Sediment Discharge, September 1949 to March 1982.
Water Temperature, October 1944 to current year (recorded as once daily during years 1945 to 1953, 1962, 1964, 1979).
Turbidity, November 2000 to current year.
DISCRETE DATA: Water years 1945 to current year.
REMARKS - The accuracy of continuous water-quality data can be found here. Sudden spikes observed in parameter readings may be due to water treatment plant maintenance.
EXTREMES FOR PERIOD OF RECORD - Maximum water temperature, 34.0 deg C, on Jun 18, 1957; minimum water temperature, -0.6 deg C, many days.
Maximum specific conductance, 468 uS/cm, on Jan 11, 1999; minimum specific conductance, 63 uS/cm on Jul 7, 1984.
Maximum pH, 10.3 std units, many days; minimum pH, 5.3 std units, on Jan 22, 1972.
Maximum dissolved oxygen, 20.0 mg/l, on Feb 11, 1989; minimum dissolved oxygen, 4.0 mg/l, many days.
Maximum dissolved oxygen, 199% saturation, on Jul 5, 2010; minimum dissolved oxygen, 59% saturation, on Aug 9/2005.
Maximum turbidity, 880 FNU, many days; minimum turbidity, < 0.5 FNU, many days.
Maximum dissolved nitrate plus nitrite, 1.64 mg/L, Oct 15, 2019; minimum dissolved nitrate plus nitrite, 0.41 mg/L, Oct 13, 2018.
