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°43'39", long 74°43'49"
referenced to North American Datum of 1983, Washington Township, Morris
County, NJ, Hydrologic Unit 02030105, on right bank 1.1 mi upstream
from bridge on County Highway 512 (Black River Road), 1.2 mi northwest
of Pottersville, and 5.5 mi upstream from Cold Brook.
PERIOD OF RECORD.--
October 1921 to current year. Monthly
discharge only for October and November 1921, published in WSP 1302.
Prior to October 1952, published as "Black River near
WSP 741: 1932. WSP 781: Drainage area. WSP
1552: 1922, 1924-29(M), 1931(M), 1933-34(M), 1938(P), 1939(M), 1940,
1941(M), 1942-46(P), 1947(M), 1948-49(P), 1951-52(P), 1953(M). WDR
NJ-80-1: Correction 1979(P).
Water-stage recorder with telemetry. Concrete control
since July 1, 1937. Datum of gage is 284.14 ft above NGVD of 1929
(levels from New Jersey Geological Survey benchmark). Prior to July 1,
1922, non-recording gage on downstream side of highway bridge at
Pottersville, 1.1 mi downstream at different datum.
Records good, except for estimated discharges, which
are fair. Flow occasionally regulated by ponds above station.
Discharges above 2400 ft3
/s from rating curve extension on
basis of logarithmic extrapolation.
EXTREMES FOR PERIOD OF RECORD.--
Maximum discharge, 3,590
/s, from rating curved extended above 2400
/s on basis of logarithmic extrapolation, Sep 8, 2011,
gage height, 5.24 ft; maximum gage height, 5.94 ft, Jul 7, 1984;
minimum discharge, 1.3 ft3
/s, Oct 4, 1930.
National Weather Service flood stage for
this gage is 4.5 ft.