LOCATION.--Lat 40°53'47", long 74°16'09"
referenced to North American Datum of 1983, Wayne Township, Passaic
County, NJ, Hydrologic Unit 02030103, on left bank on Fairfield Road in
Two Bridges, 400 ft downstream from the Pompton River, 1.4 mi northwest
of Little Falls, and 3.2 mi upstream of Beatties Dam. DRAINAGE AREA.--740 mi2, (revised). PERIOD OF RECORD.--Annual maximum, water years 1989 to current
year. Occasional low-flow measurements, water years 1991 and 1996 to
current year. REVISED RECORDS.--WDR US-2013: Drainage area. GAGE.--Water-stage recorder with telemetry. Datum of gage is
155.00 ft above NGVD of 1929. REMARKS.--Annual peak data can be obtained by selecting Peak
streamflow from the 'Available data for this site' drop-down
menu above or by using this
link. EXTREMES FOR PERIOD OF RECORD.--Maximum gage height, 17.17 ft,
Aug 30, 2011. EXTREMES OUTSIDE PERIOD OF RECORD.--The flood of Oct 10-11, 1903
reached a stage of about 18.5 ft, and may have been affected by the
failure of the Pompton Lake Dam on the Ramapo River, based on data in
the New Jersey Division of Water Policy and Supply, 1957 report
entitled "Floods on the Passaic and Pompton Rivers at Wayne
Township, Passaic County, New Jersey.".
PERIOD OF RECORD.--
DISCRETE DATA: Water years 1987-96, 1999, and 2008 to current
Dissolved Nitrate plus Nitrite: July 2009 to current year.
Dissolved Organic Carbon: July 2009 to current year.
Dissolved Oxygen: April 1989 to current year.
Dissolved Oxygen, Percent of Saturation: October 2001 to current
pH: November 2005 to current year.
Specific Conductance: April 1989 to current year.
Water Temperature: April 1989 to current year.
Total Chlorophyll-a: July 2010 to current year.
Turbidity: December 2011 current year.
REMARKS.--The station is 400 ft downstream from the confluence
of the Pompton River with the left bank of the Passaic River. One
water-quality sensor (monitor) measures the characteristics of water
pumped sequentially from three separate intakes. The station may be
impacted by occasional diversion of water from the Pompton River 750 ft
upstream from its junction with the left bank of the Passaic River,
which is 400 ft upstream from the station. If depicted,
daily-mean-diversion records are comprised of diversions to Wanaque
Reservoir and Little Falls Water-Treatment Plant, but not any
intermittent diversion to Oradell Reservoir. Interruptions in the daily
record were due to instrument or pumping-system malfunction.
The accuracy of continuous water-quality data can be found here. EXTREMES FOR PERIOD OF DAILY RECORD.--
DISSOLVED NITRATE PLUS NITRITE: Maximum 6.43 mg/L as N from right
intake, Nov 18, 2013; minimum, 0.05 mg/L as N from right intake, Mar
15, 2010 and Mar 7, 2011.
DISSOLVED ORGANIC CARBON: Maximum 10.5 mg/L from right intake,
Jul 10, 2013; minimum, 2.22 mg/L from left intake, Feb 03, 2014.
DISSOLVED OXYGEN: Maximum 20.0 mg/L (measuring limit of
instrument) from left and right intakes on many days during Jul
through Sep, 1999, from right and middle intakes Jul 25, 2001;
minimum 1.1 mg/L from left and middle intakes Apr 20, 2002.
DISSOLVED OXYGEN, PERCENT OF SATURATION: Maximum, 253% from right
intake Aug 19, 2002; minimum 12% from left and middle intakes Apr 20,
pH: Maximum 9.6 standard units from left intake Aug 3, 2007;
minimum, 6.3 standard units from right intake May 30 through 31,
SPECIFIC CONDUCTANCE: Maximum 3,560 microsiemens/cm from right
intake March 5, 2015; minimum 101 microsiemens/cm from right intake
Sep 19, 20, 1999, from left intake, Aug 29, 2011.
WATER TEMPERATURE: Maximum 31.5°C from left intake Jul 7, 1999;
minimum 0.0°C from all intakes, on many days during winters.
TOTAL CHLOROPHYLL-A: Maximum, 69.3 micrograms/L from left intake
Mar 30 to Apr 2, 2012; Minimum, <1 micrograms/L from left intake,
on many days.
TURBIDITY: Maximum, 96 FNU from left intake Dec 21, 2012; minimum
0.8 FNU from left intake Oct 6, 7, and 10, 2013.