The monitoring network within this area

Hydrionis holds 3,030 values from 10 gauges within it. Discharge is a property of a gauge and its reach, not of this drainage area, so this page reports the network and its records rather than a single figure.

Gauges

3,030

Values held

1882–2026

Record spans

Gauges within the Raritan huc8 subbasin

10 monitoring points, positioned as the publisher records them.

Flood peaks, as measured

This gauge's flood record, as measured. Unlike a daily mean it is the discharge at the moment the river was highest, which is the figure flood frequency analysis is built on.

Largest measured flow of each year at Raritan River at Manville NJ

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1903–2024.

Show relevant events (1 event)Shading marks when something was recorded, not what caused the line.

Published by the gauge's own operator from its sub-daily record; Hydrionis stores the figure rather than recomputing it. A year the gauge did not cover produces no value rather than a low one, and the gaps are stated below the chart. A peak is a property of this gauge and its reach: a larger flood upstream or downstream of it is not in this series.

What the shaded periods are (1 event)

A shaded period marks when something was recorded, not what caused the shape of the line. Where the two coincide, they coincided.

Documented record — A documented event, compiled from cited sources after it happened. The dates are as good as the record, which for older events can mean the month rather than the day.

Event	Type	Period	Standing	Authority
Hurricane Katrina water and sanitation collapse	Flood	2005-08-29 – 2005-09-30	Documented record	Compiled record

Not shown on this chart

The 1976 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
The 2022 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Yorkshire drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
European drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

Underlying data
Period	Raritan River at Manville NJ (m³/s)
1903	810
1905	527
1906	385
1909	433
1910	535
1911	306
1912	578
1914	433
1915	714
1922	368
1923	399
1924	496
1925	425
1926	368
1927	343
1929	385
1930	320
1931	274
1932	419
1933	595
1934	470
1935	297
1936	583
1938	1,022
1939	496
1940	776
1941	496
1942	940
1944	510
1945	391
1946	564
1947	212
1948	626
1950	245
1951	578
1953	436
1955	980
1957	306
1958	467
1960	416
1961	326
1962	425
1963	331
1964	385
1965	360
1966	374
1967	470
1968	481
1969	371
1970	671
1971	1,028
1972	617
1973	555
1975	487
1976	379
1977	518
1978	549
1979	651
1980	501
1981	507
1982	481
1983	646
1984	773
1985	326
1986	447
1987	498
1988	309
1989	459
1990	247
1992	348
1994	422
1995	227
1996	688
1998	309
1999	2,197
2000	189
2001	340
2002	300
2003	311
2005	547
2007	861
2008	558
2010	818
2011	1,501
2013	430
2014	716
2015	317
2016	371
2017	255
2018	377
2020	306
2021	1,668
2022	530
2023	374
2024	886

About this series

Everything below is a property of the data rather than a rating of it. There is deliberately no single confidence score: how much a gap matters depends on what you are about to do with the series, and only you know that.

Source	United States Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Measured
Period held	1903–2024
Completeness	77.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	21 separate periods inside 1903–2024 hold no value. The longest runs from 1916 to 1921 — 6 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1903 and is not continuous from it: 122 years separate the first value from the last, and 78% of the years between them are held. The span is not the record.
Last read from the publisher	2026-10-01
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

How much of the rain came back out

A discharge in cubic metres per second cannot be compared with anything: the larger number may only mean the larger catchment. Divided by the area draining to the gauge it becomes a depth of water over that land, which answers a question a reader already has — of the rain that fell here, how much came back out as river?

Water leaving the catchment above South Branch Raritan River at Stanton NJ, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1904–2024.

Show relevant events (1 event)Shading marks when something was recorded, not what caused the line.

Computed by Hydrionis from the published annual mean flow and the catchment area the station's own publisher states. It is not a water balance: the difference between rainfall and runoff is not evaporation alone but also change in groundwater storage, water abstracted and taken elsewhere, and water imported by transfer schemes — which is why a catchment can yield more runoff than the rain that fell on it without anything being measured wrongly. A different area figure rescales every value here by the ratio between them.

What the shaded periods are (1 event)

A shaded period marks when something was recorded, not what caused the shape of the line. Where the two coincide, they coincided.

Documented record — A documented event, compiled from cited sources after it happened. The dates are as good as the record, which for older events can mean the month rather than the day.

Event	Type	Period	Standing	Authority
Hurricane Katrina water and sanitation collapse	Flood	2005-08-29 – 2005-09-30	Documented record	Compiled record

Not shown on this chart

The 1976 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
The 2022 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Yorkshire drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
European drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

Underlying data
Period	South Branch Raritan River at Stanton NJ (mm)
1904	562
1905	590
1920	695
1921	464
1922	481
1923	478
1924	618
1925	634
1926	510
1927	764
1928	690
1929	573
1930	372
1931	349
1932	393
1933	606
1934	545
1935	516
1936	640
1937	564
1938	682
1939	535
1940	662
1941	357
1942	664
1943	542
1944	470
1945	797
1946	506
1947	574
1948	699
1949	472
1950	484
1951	839
1952	874
1953	611
1954	368
1955	628
1956	560
1957	413
1958	614
1959	393
1960	540
1961	525
1962	440
1963	330
1964	308
1965	224
1966	233
1967	441
1968	429
1969	369
1970	520
1971	816
1972	930
1973	902
1974	694
1975	991
1976	532
1977	604
1978	671
1979	992
1980	550
1981	299
1982	563
1983	912
1984	882
1985	455
1986	687
1987	548
1988	555
1989	854
1990	662
1991	545
1992	417
1993	695
1994	684
1995	467
1996	1,037
1997	562
1998	575
1999	430
2000	448
2001	522
2002	327
2003	941
2004	653
2005	722
2006	684
2007	692
2008	694
2009	582
2010	728
2011	1,246
2012	460
2013	581
2014	635
2015	390
2016	341
2017	315
2018	817
2019	904
2020	626
2021	704
2022	665
2023	605
2024	667

About this series

Source	United States Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Derived Computed by Hydrionis
Period held	1904–2024
Completeness	88.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1904–2024 holds no value: 1906 to 1919, 14 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1904 and is not continuous from it: 121 years separate the first value from the last, and 88% of the years between them are held. The span is not the record.
Inputs last read	2026-10-01 · when the records this was computed from were last read from their publishers
Calculation date	2026-08-24 · when the calculation method was last versioned, not a reading of any publisher
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

Every gauge Hydrionis holds within this area

Gauges within the Raritan and what each holds
Gauge	Measures	Values	Record
South Branch Raritan River at Stanton NJ	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	363	1903–2026
Raritan River at Manville NJ	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	362	1903–2026
South Branch Raritan River near High Bridge NJ	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	357	1896–2026
Lamington (Black) River near Pottersville NJ	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	349	1896–2026
Millstone River at Blackwells Mills NJ	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	346	1921–2026
North Branch Raritan River near Far Hills NJ	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	345	1919–2026
North Branch Raritan River near Raritan NJ	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	340	1896–2026
Raritan River below Calco Dam at Bound Brook NJ	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	302	1882–2026
Lawrence Brook at Farrington Dam NJ	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	230	1927–2026
Raritan River at Bound Brook NJ	catchment area, annual maximum river flow	36	1882–2026

How these gauges were attached to this water

Assigned by the publisher to a numbered basin Every gauge here is assigned to this drainage area by its own publisher, which issues the area an official code — 02030105. A drainage area is not a river: it contains the tributaries as well as the main channel, and a gauge in it may be on any of them.

What each gauge’s link to this water rests on
Gauge	Evidence	Established
South Branch Raritan River at Stanton NJ	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02
Raritan River at Manville NJ	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02
South Branch Raritan River near High Bridge NJ	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02
Lamington (Black) River near Pottersville NJ	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02
Millstone River at Blackwells Mills NJ	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02
North Branch Raritan River near Far Hills NJ	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02
North Branch Raritan River near Raritan NJ	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02
Raritan River below Calco Dam at Bound Brook NJ	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02
Lawrence Brook at Farrington Dam NJ	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02
Raritan River at Bound Brook NJ	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02

What this record holds

Hydrionis decides which waters get a page, and which of those are offered to search, from what is actually held rather than from how the page reads. Five signals are counted; this record has 5 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	9	yes, 3 or more
Years spanned	145	yes, 20 or more
Values held	3,030	yes, 1000 or more
Distinct measurements	5	yes, 2 or more
Publishers measuring it	2	yes, 2 or more
Official identifiers	1	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-usgs-01397000.json
How to cite this, and who you must credit
How these figures were produced
Request this at a different scale, format or geography

No bulk download is offered here, which is a licence position rather than a product one: at least one contributing publisher does not permit redistribution. The values can be read on the page, cited, and pointed to at source.

Attribution and citation

Suggested citation for Hydrionis

Hydrionis (2026), Raritan gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-raritan/

Cite Hydrionis where you rely on values Hydrionis computed, on the method that produced them, or on the compilation itself. The underlying measurements remain the publishers’ and their attribution requirements apply to you directly.

Recommended, not required. Hydrionis does not claim rights over unmodified public data it relayed, and doing arithmetic on somebody else’s measurements does not make them Hydrionis’s. Cite the version and the access date: the Raritan gauge records changes as publishers release and as methods are revised, and a citation without both cannot be checked later. Full guidance is on cite and reuse.

None of the contributing licences requires attribution. Crediting the publishers is still good practice and they are listed above.

Where these figures come from

MeasuredHigh confidence2025-04-06

Source: USGS — National Water Information System, USGS site 01397000, annual peak streamflow. Licence: Open.

Method: The instantaneous maximum discharge of each water year as published by USGS, dated to the day it occurred. One value per October-to-September water year; where the publisher lists both a systematic and a historic peak for a year, the larger is the annual maximum. Values the publisher marks as maximum daily averages are not held here, because they are not instantaneous peaks. Values marked as bounded rather than measured are held as censored observations carrying the bound. Cubic feet per second are converted to cubic metres per second and the publisher unit is recorded alongside.

Rating curves are extrapolated at extreme discharges, so the largest values in a peak series carry the largest measurement uncertainty. Data from the U.S. Geological Survey National Water Information System, a work of the United States government and therefore in the public domain.

Retrieved 1 October 2026.