The monitoring network within this area

Hydrionis holds 2,784 values from 4 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.

4

Gauges

2,784

Values held

1909–2026

Record spans

Gauges within the Upper Malheur huc8 subbasin

4 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 MALHEUR RIVER BEL WARMSPRINGS RES NR RIVERSIDE OR

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1909–2017.

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	MALHEUR RIVER BEL WARMSPRINGS RES NR RIVERSIDE OR (m³/s)
1909	68.8
1910	204
1915	23.2
1916	103
1917	50.4
1919	38.2
1920	8.78
1921	41.9
1922	53.0
1923	13.3
1924	12.3
1925	25.5
1926	13.3
1927	24.2
1928	36.0
1929	16.1
1930	9.71
1931	9.71
1932	13.6
1933	14.0
1934	11.4
1935	13.4
1936	20.8
1937	13.5
1938	11.8
1939	18.8
1940	17.9
1941	42.5
1942	50.1
1943	52.7
1944	21.4
1945	21.1
1946	24.4
1947	19.7
1948	17.4
1949	17.6
1950	15.9
1951	14.6
1952	59.7
1953	39.6
1954	21.0
1955	15.0
1956	18.7
1957	36.2
1958	73.9
1959	17.0
1960	17.1
1961	18.3
1962	15.1
1963	13.7
1964	16.6
1965	62.9
1966	16.6
1967	16.6
1968	14.3
1969	15.6
1970	18.3
1971	53.5
1972	27.0
1973	16.3
1974	39.1
1975	52.7
1976	17.3
1977	17.2
1978	16.6
1979	18.0
1980	34.3
1981	19.7
1982	77.3
1983	74.5
1984	89.2
1985	47.0
1986	43.6
1987	18.0
1988	11.0
1989	16.8
1990	20.3
1991	13.2
1992	9.34
1993	50.4
1994	18.6
1995	17.0
1996	19.0
1997	31.4
1998	34.8
1999	50.7
2000	34.8
2001	15.9
2002	18.6
2003	13.6
2006	67.4
2007	17.1
2008	12.1
2009	12.9
2010	17.0
2011	59.5
2014	12.7
2015	11.4
2016	14.5
2017	43.9

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	1909–2017
Completeness	91.7% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	4 separate periods inside 1909–2017 hold no value. The longest runs from 1911 to 1914 — 4 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1909 and is not continuous from it: 109 years separate the first value from the last, and 92% 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 MALHEUR RIVER BEL WARMSPRINGS RES NR RIVERSIDE OR, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1916–2016.

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	MALHEUR RIVER BEL WARMSPRINGS RES NR RIVERSIDE OR (mm)
1916	112
1920	26.0
1921	69.0
1922	83.0
1923	38.0
1924	43.0
1925	44.0
1926	45.0
1927	53.0
1928	86.0
1929	43.0
1930	15.0
1931	15.0
1932	26.0
1933	32.0
1934	35.0
1935	25.0
1936	41.0
1937	26.0
1938	34.0
1939	53.0
1940	51.0
1941	74.0
1942	74.0
1943	110
1944	57.0
1945	45.0
1946	58.0
1947	65.0
1948	47.0
1949	53.0
1950	44.0
1951	57.0
1952	82.0
1953	78.0
1954	70.0
1955	29.0
1956	55.0
1957	87.0
1958	110
1959	56.0
1960	59.0
1961	33.0
1962	47.0
1963	44.0
1964	47.0
1965	74.0
1966	63.0
1967	44.0
1968	48.0
1969	49.0
1970	64.0
1973	60.0
1974	72.0
1975	81.0
1976	66.0
1977	37.0
1978	48.0
1979	56.0
1980	51.0
1981	62.0
1982	132
1983	180
1984	167
1985	84.0
1986	85.0
1987	51.0
1988	20.0
1989	57.0
1990	45.0
1991	22.0
1992	17.0
1993	74.0
1994	51.0
1995	47.0
1996	65.0
1997	85.0
1998	76.0
1999	103
2000	87.0
2001	39.0
2002	35.0
2003	34.0
2004	48.0
2005	40.0
2006	106
2007	59.0
2008	44.0
2009	36.0
2010	45.0
2011	90.0
2012	61.0
2013	45.0
2014	30.0
2015	26.0
2016	49.0

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	Derived Computed by Hydrionis
Period held	1916–2016
Completeness	95.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	2 separate periods inside 1916–2016 hold no value. The longest runs from 1917 to 1919 — 3 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1916 and is not continuous from it: 101 years separate the first value from the last, and 95% 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

The snow standing above this water

3 automated snow stations sit inside this drainage area, weighing the snowpack rather than measuring how deep it is.

707

Fullest snowpack recorded at Blue Mountain Spring, in 1982 (mm of water)

135

Thinnest, in 2026 (mm of water)

March

Month the pack is usually at its fullest

May

Month the pack has gone by, in half of years

Peak snowpack at Blue Mountain Spring

Water years 1979–2026. Each point is the fullest month of that snow season.

A water year runs October to September and is named for the year it ends, so the snow of one winter stays in one point. The value is the fullest month, not the fullest day: a pack that peaked sharply mid-month reads lower here than a single measurement taken at the right moment would.

View the data behind this chart

Underlying data
Period	Blue Mountain Spring (mm)
1979	496
1980	468
1981	280
1982	707
1983	657
1984	604
1985	490
1986	415
1987	257
1988	208
1989	599
1990	376
1991	313
1992	230
1993	489
1994	300
1995	373
1996	322
1997	488
1998	429
1999	660
2000	466
2001	260
2002	411
2003	285
2004	448
2005	171
2006	616
2007	347
2008	493
2009	357
2010	329
2011	454
2012	379
2013	234
2014	273
2015	200
2016	429
2017	425
2018	235
2019	534
2020	361
2021	363
2022	230
2023	486
2024	403
2025	526
2026	135

Read against the river

Blue Mountain Spring and NORTH FORK MALHEUR RIVER AT BEULAH OR both sit in this drainage area, and their records overlap by 38 years. That is the span the two have in common, not a count of years both actually hold — either record may have gaps inside it. The two are shown separately rather than on one axis: millimetres of stored water and cubic metres per second are not commensurable, and a difference between them would mean nothing.

Being in the same drainage area does not put the snowpack upstream of the gauge. A subbasin is an area, and snow on one tributary can join the river below a gauge on another — so a weak relationship here may say more about which tributary was measured than about the snow.

Every gauge Hydrionis holds within this area

Gauges within the Upper Malheur and what each holds
Gauge	Measures	Values	Record
MALHEUR RIVER BEL WARMSPRINGS RES NR RIVERSIDE OR	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	330	1909–2026
NORTH FORK MALHEUR RIVER AT BEULAH OR	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	306	1926–2026
MALHEUR RIVER NEAR DREWSEY OR	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	240	1921–2026
NF MALHEUR R AB BEULAH RES NR BEULAH OR	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	209	1914–2026

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 — 17050116. 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
MALHEUR RIVER BEL WARMSPRINGS RES NR RIVERSIDE OR	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 FORK MALHEUR RIVER AT BEULAH OR	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
MALHEUR RIVER NEAR DREWSEY OR	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
NF MALHEUR R AB BEULAH RES NR BEULAH OR	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	4	yes, 3 or more
Years spanned	118	yes, 20 or more
Values held	2,784	yes, 1000 or more
Distinct measurements	6	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-13215000.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), Upper Malheur gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-malheur/

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 Upper Malheur 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 confidence2017-04-08

Source: USGS — National Water Information System, USGS site 13215000, 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.