The monitoring network within this area

Hydrionis holds 2,907 values from 5 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.

5

Gauges

2,907

Values held

1903–2026

Record spans

Gauges within the Upper Yakima huc8 subbasin

5 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 YAKIMA RIVER AT UMTANUM, WA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1906–2025.

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	YAKIMA RIVER AT UMTANUM, WA (m³/s)
1906	1,161
1908	282
1909	300
1910	303
1911	368
1914	219
1915	265
1916	396
1917	371
1919	282
1921	331
1923	268
1925	283
1926	140
1927	248
1929	174
1930	151
1931	197
1932	345
1933	239
1935	388
1936	289
1937	289
1938	368
1939	167
1940	192
1941	87.8
1942	97.7
1943	236
1944	131
1945	189
1946	281
1948	787
1949	252
1950	274
1951	340
1952	119
1953	210
1954	195
1955	362
1956	337
1957	340
1958	138
1959	211
1961	244
1962	230
1964	163
1965	331
1966	125
1967	182
1968	244
1969	226
1970	119
1971	258
1972	331
1974	309
1975	239
1977	117
1979	111
1980	230
1982	268
1983	261
1984	351
1985	135
1986	244
1988	119
1989	164
1990	200
1992	123
1993	105
1994	107
1995	253
1996	770
1997	320
1998	261
1999	251
2001	89.5
2002	242
2003	258
2004	127
2005	138
2006	169
2007	303
2008	248
2009	640
2010	125
2011	493
2012	297
2013	211
2014	200
2015	233
2017	229
2018	268
2019	125
2020	309
2021	148
2022	278
2023	181
2024	126
2025	211

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	1906–2025
Completeness	83.3% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	19 separate periods inside 1906–2025 hold no value. The longest runs from 1912 to 1913 — 2 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1906 and is not continuous from it: 120 years separate the first value from the last, and 83% 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 YAKIMA RIVER AT UMTANUM, WA, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1934–2025.

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	YAKIMA RIVER AT UMTANUM, WA (mm)
1934	685
1935	543
1936	533
1937	422
1938	499
1939	400
1940	372
1941	299
1942	328
1943	471
1944	312
1945	391
1946	549
1947	579
1948	616
1949	703
1950	717
1951	653
1952	401
1953	478
1954	619
1955	601
1956	816
1957	532
1958	480
1959	747
1960	515
1961	603
1962	518
1963	456
1964	472
1965	596
1966	396
1967	495
1968	563
1969	551
1970	399
1971	606
1972	919
1973	408
1974	687
1975	722
1976	634
1977	437
1978	536
1979	333
1980	542
1981	482
1982	573
1983	571
1984	582
1985	452
1986	448
1987	357
1988	372
1989	461
1990	634
1991	555
1992	421
1993	351
1994	339
1995	621
1996	783
1997	774
1998	525
1999	638
2000	514
2001	316
2002	504
2003	494
2004	429
2005	354
2006	500
2007	575
2008	458
2009	580
2010	441
2011	683
2012	630
2013	561
2014	588
2015	495
2016	612
2017	559
2018	569
2019	418
2020	496
2021	525
2022	574
2023	419
2024	372
2025	434

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	1934–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1934 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

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

833

Fullest snowpack recorded at Grouse Camp, in 1999 (mm of water)

128

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 Grouse Camp

Water years 1983–2026. 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	Grouse Camp (mm)
1983	769
1984	452
1985	384
1986	460
1987	505
1988	392
1989	534
1990	411
1991	299
1992	431
1993	323
1994	419
1995	617
1996	459
1997	681
1998	504
1999	833
2000	509
2001	341
2002	542
2003	520
2004	429
2005	162
2006	700
2007	557
2008	513
2009	399
2010	445
2011	573
2012	611
2013	391
2014	468
2015	186
2016	581
2017	469
2018	478
2019	397
2020	399
2021	507
2022	257
2023	455
2024	358
2025	420
2026	128

Why the snow is not read against the river here

These two series do not overlap in time: Peak snow water equivalent runs 1982–2026 and Mean river flow, water year runs 1904–1976.

Every gauge Hydrionis holds within this area

Gauges within the Upper Yakima and what each holds
Gauge	Measures	Values	Record
YAKIMA RIVER AT UMTANUM, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	335	1906–2026
CLE ELUM RIVER NEAR ROSLYN, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	260	1903–2026
KACHESS RIVER NEAR EASTON, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	258	1904–2026
YAKIMA RIVER AT CLE ELUM, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	257	1906–2026
YAKIMA RIVER NEAR MARTIN, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	251	1904–2026

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 — 17030001. 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
YAKIMA RIVER AT UMTANUM, WA	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
CLE ELUM RIVER NEAR ROSLYN, WA	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
KACHESS RIVER NEAR EASTON, WA	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
YAKIMA RIVER AT CLE ELUM, WA	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
YAKIMA RIVER NEAR MARTIN, WA	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	5	yes, 3 or more
Years spanned	124	yes, 20 or more
Values held	2,907	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-12484500.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 Yakima gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-yakima/

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 Yakima 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 confidence2025-03-27

Source: USGS — National Water Information System, USGS site 12484500, 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.