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USGS 01463500 Delaware River at Trenton NJ


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During winter months, cold and ice may result in inaccurate real-time gage height and streamflow data. Adjustments or deletions of this data can only be done after detailed analysis.



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.
PERIOD OF RECORD.--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.
REVISED RECORDS.--WSP 951: Drainage area. WSP 1302: 1913-20. WSP 1382: 1924, 1928.
GAGE.--Water-stage recorder with telemetry. Datum of gage is NGVD of 1929. 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.
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.
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.


Water years 1945 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.
REMARKS.--Data were collected in cooperation with the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program and the Delaware River Basin Commission (DRBC).
The accuracy of continuous water-quality data can be found here.
DISSOLVED OXYGEN, PERCENT OF SATURATION: Maximum, 199 %, Jul 5, 2010; minimum, 59 %, Aug 9, 2005.
pH: Maximum, 10.3 standard units, Aug 9, 10, 1983; minimum, 5.3 standard units, Jun 22, 1972.
SPECIFIC CONDUCTANCE: Maximum, 468 microsiemens/cm, Jan 11, 1999; minimum, 63 microsiemens/cm, Jul 7, 1984.
WATER TEMPERATURE: Maximum, 34.0°C, Jun 18, 1957; minimum, -0.6°C, on many days during winter months in water years 1954-57.
TURBIDITY: Maximum, 880 FNU, Jun 28, 29, 2006; minimum, <0.5 FNU, on many days throughout the period of record.

Peak Flood Chart

Gage Photo

NEW: Flood Inundation Maps Now Available for this Gage.

National Weather Service flood stage for this gage is 20.0 ft.

Forecasts for this gage are issued by the National Weather Service routinely year-round.
Forecast information is available here.

This station managed by the New Jersey Water Science Center.

Available Parameters Available Period
All 8 Available Parameters for this site
00010 Temperature, water, Pennsylvania side 2007-10-01  2017-04-28
00060 Discharge 2007-10-01  2017-04-28
00065 Gage height 2007-10-01  2017-04-28
00095 Specific cond at 25C, Pennsylvania side 2007-10-01  2017-04-28
00300 Dissolved oxygen, Pennsylvania side 2007-10-01  2017-04-28
00301 Diss oxygen,%saturtn, Pennsylvania side 2007-10-01  2017-04-28
00400 pH, Pennsylvania side 2007-10-01  2017-04-28
63680 Turbidity, Form Neph, Pennsylvania side 2007-10-02  2017-04-28

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Discharge, cubic feet per second

Most recent instantaneous value: 15000 04-28-2017   04:15 EDT
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Daily discharge, cubic feet per second -- statistics for Apr 28 based on 104 years of record more
Most Recent
Value Apr 28
Median Mean 75th
5140 10300 15000 15500 17300 20700 60700

Gage height, feet

Most recent instantaneous value: 10.48 04-28-2017   04:15 EDT
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