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[!] Over the next year, the USGS Pennsylvania Water Science Center will be updating the geodetic vertical elevation (gage datum) for many locations. Click HERE for additional information including a current list of streamgages with upcoming datum changes. This update in gage datum does not affect the location of the streamgage, nor the observed local gage height or discharge recorded at the streamgage.

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USGS 01458500 Delaware River at Frenchtown 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°31'34", long 75°03'54" referenced to North American Datum of 1983, Frenchtown Borough, Hunterdon County, NJ, Hydrologic Unit 02040105, on upstream side of Uhlerstown-Frenchtown bridge, about 200 ft west of left back in Frenchtown, 900 ft upstream of mouth of Nishisakawick Creek, 0.5 mi southeast of Jugtown, PA, and 3.0 miles west of Baptistown.
DRAINAGE AREA.--6,420 mi².
PERIOD OF RECORD.--Annual maximum gage, water years 1936-1956, 2005-2006, Continuous-record gage-height station, water years 2008 to current year.
GAGE.--Water-stage recorder with telemetry. Datum of gage is 99.04 ft above NAVD of 1988.
COOPERATION.--Gage operated in cooperation with the Delaware River Joint Toll Bridge Commission.
REMARKS.--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, 27.79 ft, Aug 20, 1955.
EXTREMES OUTSIDE PERIOD OF RECORD.--The flood of Oct 10, 1903 reached a gage height of 24.4 ft.



Water years 1976 to 1982.

Dissolved Oxygen: September 2014 to current year.
Dissolved Oxygen, Percent of Saturation: September 2014 to current year.
pH: September 2014 to current year.
Specific Conductance: September 2014 to current year.
Water Temperature: September 2014 to current year.
Turbidity: September 2014 to current year.

REMARKS.--The accuracy of continuous water-quality data can be found here.
DISSOLVED OXYGEN: Maximum, 16.8 mg/L, Dec 29, 2017; minimum, 5.8 mg/L, Jul 8-9, 25, 2016.
DISSOLVED OXYGEN, PERCENT OF SATURATION: Maximum, 200%, Jun 18, 2018; minimum, 69%, May 1, 4, 2015, Sep 11, 2015, Jul 9, 2016.
pH: Maximum, 9.4 standard units, Jul 24-26, 2015, Jun 17-18, 2018; minimum, 6.9 standard units, May 26, 2016, Jun 3, 2016.
SPECIFIC CONDUCTANCE: Maximum, 493 microsiemens/cm, Feb 9, 2018; minimum, 98 microsiemens/cm, Apr 8, 2017.
WATER TEMPERATURE: Maximum, 30.5°C, Jul 3, 2018; minimum, -0.1°C, Dec 15, 2016.
TURBIDITY: Maximum, 620 FNU, Feb 03, 2016; minimum, <0.5 FNU on many days.

Peak Flood Chart

Gage Photo

National Weather Service flood stage for this gage is 16.0 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
2014-10-01  2022-08-17
2007-10-01  2022-08-17
2014-10-01  2022-08-17
2014-10-01  2022-08-17
2014-10-01  2022-08-17
2014-10-01  2022-08-17
2014-10-01  2022-08-17


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Summary of all available data for this site
Instantaneous-data availability statement

Temperature, water, degrees Celsius

Most recent instantaneous value: 23.6 08-17-2022   01:00 EDT
Graph of  Temperature, water, degrees Celsius

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