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USGS 01460440 Delaware and Raritan Canal at Port Mercer 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°18'16", long 74°41'06" referenced to North American Datum of 1983, Lawrence Township, Mercer County, NJ, Hydrologic Unit 02040105, on right bank, 300 ft upstream from bridge on Province Line (Quaker Bridge) Road at Port Mercer, 2.2 mi east of Lawrenceville, and 3.5 mi southwest of Princeton.
PERIOD OF RECORD.--Continuous-record discharge station August 1990 to current year. Miscellaneous measurements made 1923, 1937-38, 1942-43, 1945, 1981, 1987-90.
GAGE.--Water-stage, velocity and water temperature recorder with telemetry. Datum of gage is at NAVD 1988. Prior to April 15, 2019, published as gage height above NGVD 1929. To convert from NAVD 1988 to NGVD 1929 add 1.11 ft.
REMARKS.--Records fair, except for estimated discharges and flows under 10 ft³/s, which are poor. The canal diverts water from the Delaware River at Raven Rock and discharges into Raritan River at New Brunswick. Reverse flow (denoted by a negative symbol) can occur during periods of heavy precipitation due to waste gate operation upstream and inflow into canal downstream from gage. Gage is located at the drainage divide between the Delaware and Raritan River Basins.
EXTREMES FOR PERIOD OF RECORD.--Maximum positive daily discharge, 222 ft³/s, Aug 22, 1990; maximum negative daily discharge, -637 ft³/s, Apr 16, 2007; maximum gage height, 62.66 ft, Aug 28, 2011.

Peak Flood Chart

Gage Photo

The water temperature data for this station are temporary and will only be displayed for 120 days. Although the instrumentation is calibrated at least once/year, the temporary classification means that documented routine inspections and other quality assurance measures are not performed that would make the data acceptable for archival, retrieval, or future use in general scientific or interpretive studies.

This station managed by the New Jersey Water Science Center.

Available Parameters Available Period
1989-10-23  2021-04-17
1999-10-01  2021-04-17


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

Discharge, cubic feet per second

Most recent instantaneous value: 151 04-17-2021   17:30 EDT
Graph of  Discharge, cubic feet per second

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Daily discharge, cubic feet per second -- statistics for Apr 17 based on 29 water years of record more
Mean Median 75th
Most Recent
Value Apr 17
-63.1 115 123 133 144 151 155