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:
Lat 40°16'16", long 74°46'24"
referenced to North American Datum of 1983, Ewing Township, Mercer
County, NJ, Hydrologic Unit 02040105, on upstream left bank of dam at
outlet of Sylva Lake, on the campus of The College of New Jersey, 0.3
mi downstream from the outlet of Ceva Lake, 0.4 mi downstream of bridge
on Ewingville Road, and 0.6 mi southeast of Ewingville.
PERIOD OF RECORD.--
November 2008 to current year.
Water-stage and precipitation recorder with telemetry and
crest-stage gage. Datum of gage is 86 ft NAVD of 1988.
Records fair, except for estimated discharges, which
are poor. Discharges above 1,100 ft3
/s from rating curve
extension on basis of peak flow over dam computation.
EXTREMES FOR PERIOD OF RECORD.--
Maximum discharge, 2,040
/s, Aug 22, 2009, gage height, 6.30 ft; minimum
discharge, 0.00 ft3
/s, many days.
EXTREMES OUTSIDE PERIOD OF RECORD.--
The flood of July 21, 1975
reached a stage of 95.3 ft above NGVD of 1929, from flood marks,
discharge of 5,550 ft3
/s computed by a combination of
flow-over-dam and flow-over-embankment computations. The flood of Aug
28, 1971 reached a stage of 94.2 ft above NGVD of 1929.
Rain gage data is available from this location at this link