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* IMPORTANT: Next Generation Station Page

USGS 01393890 East Branch Rahway River at Maplewood NJ


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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.



LOCATION.--Lat 40°44'05", long 74°16'14" referenced to North American Datum of 1983, Maplewood Township, Essex County, NJ, Hydrologic Unit 02030104, on downstream right wingwall of bridge on Jefferson Avenue in Maplewood, 1,100 ft west of Fielding School, and 2.5 mi upstream of confluence of West Branch Rahway River and East Branch Rahway River.
DRAINAGE AREA.--5.11 mi².
PERIOD OF RECORD.--Continuous-record gage-height station with annual maximum discharge, water years 1971, 1998 to current year. Occasional low-flow measurements, water years 2000 to 2006.
REVISIONS HISTORY.--WDR-US-08: 1971(M), 1998(M), 1999(M), 2000(M).
GAGE.--Water-stage recorder with telemetry and crest-stage gage. Datum of gage is 114.60 ft above NGVD of 1929.
REMARKS.--Discharges above 700 ft³/s from rating curve extension on basis of computation of peak flow through culvert and over road. 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 discharge, 3,470 ft³/s, Sep 16, 1999, gage height, 10.08 ft, from rating curve extension on basis of computation of peak flow through culvert and over road.

Peak Flood Chart

Gage Photo

Rain gage data are available from this location at this link.

The water temperature data for this station are temporary and will only be displayed for 120 days. Although the instrumentation is calibrated at least once/year, the temporary classification means that documented routine inspections and other quality assurance measures are not performed that would make the data acceptable for archival, retrieval, or future use in general scientific or interpretive studies.

This station managed by the New Jersey Water Science Center.

Available Parameters Available Period
2019-12-04  2020-04-02
2008-09-30  2020-04-02


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

Gage height, feet

Most recent instantaneous value: 2.34 04-02-2020   20:10 EDT
Graph of  Gage height, feet

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