The monitoring network within this area

Hydrionis holds 3,883 values from 7 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.

7

Gauges

3,883

Values held

1903–2026

Record spans

Gauges within the Umatilla huc8 subbasin

7 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 UMATILLA RIVER NEAR UMATILLA, OR

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1904–2025.

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	UMATILLA RIVER NEAR UMATILLA, OR (m³/s)
1904	227
1905	53.5
1906	555
1907	159
1908	413
1909	139
1910	172
1911	60.3
1912	139
1913	263
1914	88.9
1915	69.4
1916	297
1917	289
1919	143
1920	192
1921	235
1922	152
1923	88.6
1924	115
1925	126
1926	139
1927	98.8
1928	148
1929	102
1930	73.3
1931	425
1932	354
1933	85.5
1934	96.0
1935	77.6
1936	123
1937	102
1938	85.5
1939	131
1940	106
1942	102
1943	104
1944	111
1945	99.7
1946	317
1948	172
1949	328
1950	143
1951	136
1952	128
1953	156
1955	82.1
1957	164
1958	261
1960	78.4
1961	114
1962	94.9
1963	159
1964	88.6
1965	561
1966	42.5
1967	164
1969	203
1970	225
1971	143
1972	286
1974	182
1975	413
1977	57.2
1979	204
1980	103
1981	242
1982	282
1983	229
1984	241
1985	142
1986	374
1987	88.9
1988	97.7
1989	178
1990	59.2
1991	377
1993	260
1994	103
1995	238
1996	462
1997	371
1998	91.5
2000	83.0
2001	51.8
2002	167
2003	164
2004	132
2005	62.3
2006	179
2008	99.4
2009	158
2010	132
2011	272
2012	109
2013	181
2014	251
2016	140
2017	214
2018	184
2019	365
2020	765
2021	80.7
2022	193
2023	130
2024	127
2025	182

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	1904–2025
Completeness	88.5% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	14 separate periods inside 1904–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1904 and is not continuous from it: 122 years separate the first value from the last, and 89% 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 UMATILLA RIVER NEAR UMATILLA, 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. 1905–2025.

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	UMATILLA RIVER NEAR UMATILLA, OR (mm)
1905	45.0
1906	105
1907	117
1908	56.0
1909	64.0
1910	88.0
1911	39.0
1912	131
1913	132
1914	66.0
1915	39.0
1916	141
1917	166
1918	80.0
1919	74.0
1920	83.0
1921	127
1922	83.0
1923	59.0
1924	52.0
1925	57.0
1926	42.0
1927	95.0
1928	98.0
1929	44.0
1930	31.0
1931	44.0
1932	98.0
1933	75.0
1934	34.0
1935	27.0
1936	48.0
1937	41.0
1938	45.0
1939	41.0
1940	53.0
1941	36.0
1942	81.0
1943	101
1944	35.0
1945	75.0
1946	91.0
1947	66.0
1948	127
1949	86.0
1950	101
1951	85.0
1952	56.0
1953	91.0
1954	36.0
1955	59.0
1956	93.0
1957	75.0
1958	110
1959	71.0
1960	54.0
1961	54.0
1962	49.0
1963	46.0
1964	58.0
1965	85.0
1966	24.0
1967	42.0
1968	32.0
1969	79.0
1970	84.0
1971	64.0
1972	113
1973	46.0
1974	122
1975	101
1976	76.0
1977	27.0
1978	52.0
1979	85.0
1980	68.0
1981	73.0
1982	129
1983	108
1984	143
1985	67.0
1986	81.0
1987	41.0
1988	40.0
1989	100
1990	40.0
1991	84.0
1992	29.0
1993	105
1994	52.0
1995	126
1996	133
1997	141
1998	72.0
1999	80.0
2000	79.0
2001	55.0
2002	59.0
2003	75.0
2004	91.0
2005	35.0
2006	88.0
2007	56.0
2008	80.0
2009	101
2010	66.0
2011	171
2012	85.0
2013	68.0
2014	92.0
2015	51.0
2016	62.0
2017	118
2018	89.0
2019	135
2020	112
2021	72.0
2022	105
2023	80.0
2024	72.0
2025	83.0

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	1905–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1905 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

The snow standing above this water

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

444

Fullest snowpack recorded at Bowman Springs, in 1989 (mm of water)

34

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 Bowman Springs

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	Bowman Springs (mm)
1979	356
1980	240
1981	95.0
1982	355
1983	241
1984	284
1985	345
1986	174
1987	298
1988	157
1989	444
1990	126
1991	95.0
1992	88.0
1993	217
1994	140
1995	164
1996	144
1997	235
1998	210
1999	188
2000	257
2001	141
2002	209
2003	127
2004	298
2005	80.0
2006	221
2007	98.0
2008	234
2009	242
2010	119
2011	236
2012	131
2013	146
2014	164
2015	69.0
2016	161
2017	197
2018	133
2019	391
2020	277
2021	375
2022	205
2023	187
2024	197
2025	288
2026	34.0

Why the snow is not read against the river here

Peak snow water equivalent and Mean river flow, water year overlap for only 9 years at these subjects. A relationship read off a span that short is reading the weather of a few seasons.

Every gauge Hydrionis holds within this area

Gauges within the Umatilla and what each holds
Gauge	Measures	Values	Record
UMATILLA RIVER NEAR UMATILLA, OR	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	401	1904–2026
UMATILLA RIVER AT YOAKUM,OREG.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	296	1903–2026
MCKAY CREEK NEAR PENDLETON,OREG.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	234	1919–2026
MCKAY CREEK NEAR PILOT ROCK,OREG.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	220	1926–2026
BUTTER CREEK NEAR PINE CITY, OREG.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	205	1929–2026
UMATILLA RIVER AT PENDLETON,OREG	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	199	1904–2026
BIRCH CREEK AT RIETH, OR	catchment area, annual maximum river flow	48	1928–2026

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 — 17070103. 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
UMATILLA RIVER NEAR UMATILLA, 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
UMATILLA RIVER AT YOAKUM,OREG.	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
MCKAY CREEK NEAR PENDLETON,OREG.	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
MCKAY CREEK NEAR PILOT ROCK,OREG.	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
BUTTER CREEK NEAR PINE CITY, OREG.	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
UMATILLA RIVER AT PENDLETON,OREG	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
BIRCH CREEK AT RIETH, 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	6	yes, 3 or more
Years spanned	124	yes, 20 or more
Values held	3,883	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-14033500.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), Umatilla gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-umatilla/

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 Umatilla 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 confidence2025-02-24

Source: USGS — National Water Information System, USGS site 14033500, 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.