Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

Click to hideNews Bulletins
  • Notice of planned maintenance to underlying USGS network September 24-26, 2021: During this maintenance period users may experience intermittent periods of inaccessibility or delayed delivery of hydrologic data to the USGS National Water Information System (NWIS). Please email gs-w_support_nwisweb@usgs.gov with any concerns regarding impacts to data delivery.
  • Explore the NEW USGS National Water Dashboard interactive map to access real-time water data from over 13,500 stations nationwide.
  • Full News RSS icon
! We're replacing this page with a Next Generation Monitoring Location Page.
We're modernizing Water Data for the Nation delivery. Find out what this means for you. This page will be discontinued Jan.1, 2023.

USGS 01382500 Pequannock River at Macopin Intake Dam NJ


Click to hidestation-specific text



LOCATION.--Lat 41°01'06", long 74°24'04" referenced to North American Datum of 1983, West Milford Township, Passaic County, NJ, Hydrologic Unit 02030103, on left bank 15 ft downstream from culvert at crossover between northbound and southbound lanes on State Route 23, 1,000 ft downstream from abandoned Macopin Intake Dam, 0.6 mi downstream from Macopin River, and 2.8 mi northwest of Butler.
DRAINAGE AREA.--63.7 mi2.
PERIOD OF RECORD.--January 1898 to March 1990, September 1992 to current year. Monthly discharge only for some periods, published in WSP 1302. Records for January 1892 to December 1897, published in WSP 541, have been found to be unreliable therefore should not be used.
GAGE.--Water-stage recorder with telemetry and crest-stage gage. Datum of gage is 549.17 ft above NGVD of 1929. Prior to May 22, 1970, at site just upstream from Macopin Intake Dam, at datum 34.38 ft higher (revised). May 22, 1970 to March 5, 1990, at site just upstream from Macopin Intake Dam, at datum 20.83 ft higher.
COOPERATION.--Prior to May 22, 1970, discharge figures provided by city of Newark.
REMARKS.--Records fair, except for discharges above 1,000 ft3/s and estimated discharges, which are poor. Flow regulated by Canistear, Oak Ridge, Clinton, and Charlotteburg Reservoirs, and Echo Lake. Water diverted at Charlotteburg Reservoir for municipal supply of city of Newark.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,100 ft3/s, Oct 10, 1903, gage height, 17.40 ft, site and datum then is use; minimum discharge, not determined.


Water years 1924, 1962-69, 1973-79, 1991 to current year.
Dissolved Oxygen: July 2001.
Dissolved Oxygen, Percent of Saturation: July 2001.
Specific Conductance: July 2001.
Water Temperature: July 2001, July 2009 to October 2014.
REMARKS.--Discrete water-quality data were collected as part of the New Jersey Ambient Surface-Water-Quality Monitoring Network.
The accuracy of continuous water-quality data can be found here.
Gage Photo

Peak Flood Chart

National Weather Service flood stage for this gage is 5.5 ft.

Forecasts for this gage are issued by the National Weather Service routinely year-round.
Forecast information is available here.

Verified water-temperature data are available April through September. Data between October and March are only provisional.

Web Camera
Static Web Camera Image Gallery
This station managed by the New Jersey Water Science Center.

Available Parameters Available Period
2009-07-29  2014-11-01
1981-10-02  2021-09-26
2018-09-27  2021-09-26


  -- or --



Summary of all available data for this site
Instantaneous-data availability statement

Discharge, cubic feet per second

Most recent instantaneous value: 124 09-26-2021   05:10 EDT
Graph of  Discharge, cubic feet per second

Add up to 2 more sites and replot for "Discharge, cubic feet per second"


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages

Daily discharge, cubic feet per second -- statistics for Sep 26 based on 94 water years of record more
Median 75th
Mean Most Recent
Value Sep 26
0.00 0 1.6 8.1 15 124 255

Gage height, feet

Most recent instantaneous value: 3.34 09-26-2021   05:10 EDT
Graph of  Gage height, feet

Add up to 2 more sites and replot for "Gage height, feet"


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages