❄️Streamflow data may be affected by ice during winter months. For more details, see <a href="https://tinyurl.com/ysth3tn8">How Does Ice in Rivers and Streams Affect USGS Streamflow Data?</a>

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Available data

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Continuous data

11 data types available - data from 1981-10-01 to 2026-08-04

Daily data

7 data types available - data from 1903-10-01 to 2026-08-03

Field measurements

3 data types available - data from 1971-07-20 to 2026-06-09

Discrete sample data

340 Observed properties (data types) available - with data from 1923-08-12 to 2026-07-20

393 Sampling activities

Statistical tables for select daily data types

6 data types available - data from 1903-10-01 to 2026-08-03

Location details and information

Available location images

Raritan River at Manville

Raritan River at Manville, NJ

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Operated in cooperation with:

New Jersey Department of Environmental Protection

New Jersey Water Supply Authority

USGS - Cooperative Matching Funds

USGS - Federal Priority Streamgages

Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	01400500	n/a
Location name	Raritan River at Manville NJ	n/a
Site type	Stream	ST
Decimal latitude (WGS84)	40.5555555555556	n/a
Decimal longitude (WGS84)	-74.5827777777778	n/a
Latitude-longitude method	Interpolated from MAP.	M
Latitude-longitude accuracy	Accurate to + or - 1 sec.	S
District	New Jersey	34
State	New Jersey	34
County	Somerset County	035
Country	United States of America	n/a
Altitude of gage/land surface	20.61 feet	n/a
Method altitude determined	Level or other surveyed method.	L
Altitude accuracy	0.01 feet	n/a
Altitude datum	National Geodetic Vertical Datum of 1929	NGVD29
Subbasin hydrologic unit	Raritan	02030105
Drainage basin		n/a
Date of first construction		n/a
Drainage area	490 square miles	n/a
Contributing drainage area		n/a
Time zone abbreviation	EST	n/a
Site honors Daylight Saving Time	Y	n/a
National aquifer		n/a
Local aquifer		n/a
Local aquifer type		n/a
Well depth		n/a
Hole depth		n/a
Source of depth data		n/a

Monitoring location Raritan River at Manville NJ - USGS-01400500