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
Funding for this site is provided by:
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.--
August 1990 to current year. Miscellaneous
measurements made 1923, 1937-38, 1942-43, 1945, 1981, 1987-90.
Water-stage, velocity and water temperature recorder with
telemetry. Datum of gage is NGVD of 1929.
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
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.
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.