The monitoring network within this area

Hydrionis holds 1,037 values from 3 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

1,037

Values held

1909–2026

Record spans

Gauges within the Westfield River huc8 subbasin

3 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 WESTFIELD RIVER AT KNIGHTVILLE, MA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1910–2025.

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	WESTFIELD RIVER AT KNIGHTVILLE, MA (m³/s)
1910	230
1911	67.4
1912	206
1913	194
1914	161
1915	234
1916	112
1917	91.5
1918	60.6
1919	204
1920	191
1922	162
1923	127
1924	297
1925	230
1926	162
1927	138
1929	146
1930	86.4
1931	253
1932	131
1933	447
1934	215
1935	139
1936	728
1937	272
1938	1,073
1939	200
1940	194
1941	99.7
1942	99.1
1944	38.2
1945	189
1946	80.4
1947	109
1948	131
1949	152
1950	100
1951	116
1952	94.3
1953	123
1954	94.3
1955	133
1956	124
1957	58.9
1958	110
1959	80.7
1960	101
1961	117
1962	117
1963	70.8
1964	73.1
1965	74.8
1966	37.9
1967	67.7
1968	89.5
1969	101
1971	70.8
1972	93.7
1973	92.9
1975	114
1976	103
1977	112
1979	96.8
1980	101
1981	102
1982	97.4
1983	112
1984	96.6
1985	76.5
1986	83.8
1987	150
1988	68.5
1989	71.1
1990	103
1996	101
1998	92.9
1999	96.6
2000	104
2001	101
2002	57.8
2003	80.4
2004	98.0
2005	104
2007	105
2008	107
2009	85.5
2010	105
2011	121
2013	105
2014	91.2
2016	84.4
2017	206
2018	98.3
2020	80.7
2021	85.5
2023	76.7
2025	61.4

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	1910–2025
Completeness	84.5% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	14 separate periods inside 1910–2025 hold no value. The longest runs from 1991 to 1995 — 5 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1910 and is not continuous from it: 116 years separate the first value from the last, and 84% 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 WESTFIELD RIVER NEAR WESTFIELD, MA, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1915–2025.

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	WESTFIELD RIVER NEAR WESTFIELD, MA (mm)
1915	556
1916	658
1917	567
1918	524
1919	608
1920	832
1921	515
1922	621
1923	634
1924	605
1925	549
1926	536
1927	865
1928	787
1929	597
1930	385
1931	526
1932	528
1933	715
1934	703
1935	495
1936	680
1937	845
1938	914
1939	530
1940	622
1941	362
1942	662
1943	723
1944	468
1945	856
1946	517
1947	610
1948	656
1949	548
1950	564
1951	795
1952	821
1953	779
1954	737
1955	1,129
1956	638
1957	381
1958	655
1959	590
1960	714
1961	578
1962	465
1963	415
1964	412
1965	270
1966	380
1967	551
1968	609
1969	728
1970	559
1971	591
1972	1,004
1973	901
1974	676
1975	952
1976	669
1977	841
1978	627
1979	943
1980	503
1981	414
1982	681
1983	921
1984	860
1985	500
1986	623
1987	675
1988	548
1989	696
1990	814
1991	605
1992	599
1993	712
1994	611
1995	570
1996	1,115
1997	622
1998	706
1999	661
2000	778
2001	565
2002	449
2003	878
2004	642
2005	809
2006	755
2007	604
2008	998
2009	742
2010	724
2011	1,208
2012	495
2013	717
2014	733
2015	505
2016	397
2017	587
2018	1,056
2019	693
2020	579
2021	899
2022	549
2023	992
2024	707
2025	547

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	1915–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1915 to 2025 is held.
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 Westfield River and what each holds
Gauge	Measures	Values	Record
WESTFIELD RIVER NEAR WESTFIELD, MA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	370	1914–2026
WESTFIELD RIVER AT KNIGHTVILLE, MA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	367	1909–2026
MIDDLE BRANCH WESTFIELD RIVER AT GOSS HEIGHTS, MA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	300	1910–2026

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 — 01080206. 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
WESTFIELD RIVER NEAR WESTFIELD, MA	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
WESTFIELD RIVER AT KNIGHTVILLE, MA	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
MIDDLE BRANCH WESTFIELD RIVER AT GOSS HEIGHTS, MA	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	3	yes, 3 or more
Years spanned	118	yes, 20 or more
Values held	1,037	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-01183500.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), Westfield River gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-westfield-river/

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 Westfield River 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 confidence2025-05-06

Source: USGS — National Water Information System, USGS site 01183500, 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.