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°58'51", long 74°57'12"
referenced to North American Datum of 1983, Blairstown Township, Warren
County, NJ, Hydrologic Unit 02040105, on right bank 1,200 ft upstream
from bridge on State Route 94 in Blairstown, 1,400 ft upstream from
Blair Creek, and 10 mi upstream from mouth.
PERIOD OF RECORD.--
October 1921 to September 1976, October 1977
to current year.
WSP 971: 1942. WSP 1382: 1952-53(M).
Water-stage recorder with telemetry. Concrete control at
current location since Aug 1941. Datum of gage is 335.86 ft above NGVD
of 1929. Prior to May 23, 1922, a non-recording gage was located at
former highway bridge 1,300 ft downstream of current location. From May
23, 1922 to Jun 24, 1931, a water-stage recorder was located 1,300 ft
downstream at former highway bridge. Water-stage recorder was located
100 ft downstream of current location from Aug 8, 1931 to Jul 28, 1939
(same datum). Water-stage recorder was relocated to current site on Jul
28, 1939. A concrete control was 280 ft downstream of current location
from Aug 1931 until it was destroyed in Jun 1941. Water-stage recorder
was temporarily relocated to old site (100 ft downstream of current
location) from Jun 9 to Aug 4, 1941 during construction of current
Records good, except for estimated discharges, which
are fair. Temporary fluctuations caused by unknown source and flow
regulated slightly by Swartswood Lake and other lakes and ponds.
Pumpage from limestone quarry entered tributary upstream from gage for
about 60 years, but largely ceased in April 2004.
EXTREMES FOR PERIOD OF RECORD.--
Maximum discharge, 8,750 ft³/s,
Aug 19, 1955, gage height, 11.12 ft, from high-water mark in gage
house; minimum discharge, 2.8 ft³/s, Nov 1, 1922.
PERIOD OF RECORD1.--
Water years 1921, 1925, 1957-60,
1962-63, 1976 to current year.
Discrete water-quality data were collected
as part of the
New Jersey Ambient Surface-Water-Quality Monitoring Network
1 Water-Quality Records
National Weather Service flood stage for
this gage is 5 ft.