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
analysis.
Funding for this site is provided by:
SURFACE-WATER RECORDS
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.
PERIOD OF RECORD.--Annual maximum, water years 1989 to current
year. Occasional low-flow measurements, water years 1991 and 1996 to
current year.
REVISIONS HISTORY.--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.".
WATER-QUALITY RECORDS
PERIOD OF RECORD.--
- DISCRETE DATA: Water years 1987-96, 1999, and 2008 to current
year.
- CONTINUOUS DATA:
- 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
year.
- 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, 6.61 mg/L as N, from right intake, Sep 18, 2017;
minimum, 0.04 mg/L as N, from right intake, Mar 15, 2010, from left and
right intakes, Aug 29, 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, 2002.
pH:
Maximum, 9.6 standard units, from left intake, Aug 3, 2007; minimum,
6.3 standard units, from right intake, May 30, 31, 2013.
SPECIFIC CONDUCTANCE:
Maximum, 3,370 microsiemens/cm, from right intake, Feb 4, 2011, from
middle and right intakes, Feb 14, 2017; minimum, 101 microsiemens/cm,
from right intake, Sep 19, 20, 1999, from left intake, Aug 29,
2011.
WATER TEMPERATURE:
Maximum, 31.4°C, from left intake, Jul 7, 1999; minimum, 0.0°C, from
left and right 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,
110 FNU, from left intake, Jul 31, 2016, from middle and right intakes,
Aug 1, 2016; minimum, 0.8 FNU, from left intake, Oct 6, 7, 10,
2013.
Peak
Flood Chart
National Weather Service flood stage for
this gage is 9.0 ft.
