The monitoring network within this area

Hydrionis holds 2,714 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

2,714

Values held

1889–2026

Record spans

Gauges within the Upper Yellowstone 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 Yellowstone River at Corwin Springs MT

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1890–2024.

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	Yellowstone River at Corwin Springs MT (m³/s)
1890	337
1891	254
1892	453
1893	385
1911	731
1912	473
1913	657
1914	422
1915	219
1916	680
1917	657
1918	906
1919	337
1920	504
1921	617
1922	413
1923	379
1924	256
1925	589
1926	328
1927	708
1928	716
1929	408
1930	331
1931	368
1932	447
1933	447
1934	240
1935	501
1936	447
1937	343
1938	513
1939	405
1940	351
1941	292
1942	476
1943	691
1944	340
1945	518
1946	442
1947	530
1948	623
1949	439
1950	541
1951	544
1952	586
1953	558
1954	524
1955	419
1956	671
1957	561
1958	447
1959	612
1960	402
1961	419
1962	530
1963	504
1964	501
1965	626
1966	416
1967	614
1968	552
1969	513
1970	566
1971	714
1972	654
1973	487
1974	875
1975	589
1976	544
1977	348
1978	583
1979	493
1980	362
1981	575
1982	699
1983	439
1984	464
1985	416
1986	620
1987	216
1988	394
1989	445
1990	433
1991	580
1992	391
1993	617
1994	442
1995	626
1996	912
1997	912
1998	442
1999	583
2000	496
2001	371
2002	606
2003	674
2004	334
2005	476
2006	538
2007	371
2008	643
2009	595
2010	736
2011	858
2012	552
2013	470
2014	745
2015	345
2016	309
2017	660
2018	728
2019	544
2020	818
2021	425
2022	1,549
2023	510
2024	470

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	1890–2024
Completeness	87.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1890–2024 holds no value: 1894 to 1910, 17 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1890 and is not continuous from it: 135 years separate the first value from the last, and 87% 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 Yellowstone River at Corwin Springs MT, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1890–2025.

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	Yellowstone River at Corwin Springs MT (mm)
1890	432
1891	364
1892	466
1911	509
1912	425
1913	573
1914	417
1915	330
1916	508
1917	534
1918	553
1919	250
1920	419
1921	416
1922	347
1923	351
1924	313
1925	548
1926	343
1927	534
1928	534
1929	344
1930	352
1931	252
1932	381
1933	334
1934	247
1935	344
1936	351
1937	283
1938	428
1939	353
1940	307
1941	302
1942	363
1943	555
1944	321
1945	395
1946	379
1947	453
1948	434
1949	400
1950	458
1951	490
1952	454
1953	358
1954	422
1955	337
1956	512
1957	421
1958	312
1959	384
1960	299
1961	316
1962	486
1963	416
1964	448
1965	549
1966	333
1967	506
1968	471
1969	447
1970	469
1971	562
1972	526
1973	346
1974	553
1975	454
1976	510
1977	258
1978	464
1979	352
1980	357
1981	359
1982	533
1983	409
1984	449
1985	345
1986	491
1987	255
1988	260
1989	384
1990	394
1991	422
1992	362
1993	461
1994	307
1995	455
1996	595
1997	693
1998	453
1999	508
2000	375
2001	260
2002	360
2003	366
2004	325
2005	351
2006	402
2007	291
2008	500
2009	493
2010	391
2011	616
2012	405
2013	318
2014	510
2015	329
2016	317
2017	555
2018	578
2019	426
2020	445
2021	294
2022	416
2023	420
2024	342
2025	308

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	1890–2025
Completeness	86.8% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1890–2025 holds no value: 1893 to 1910, 18 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1890 and is not continuous from it: 136 years separate the first value from the last, and 87% 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

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

416

Fullest snowpack recorded at Box Canyon, in 2011 (mm of water)

125

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 Box Canyon

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	Box Canyon (mm)
1979	261
1980	254
1981	147
1982	356
1983	223
1984	152
1985	241
1986	230
1987	172
1988	221
1989	220
1990	269
1991	272
1992	190
1993	181
1994	201
1995	163
1996	339
1997	401
1998	191
1999	300
2000	236
2001	138
2002	192
2003	232
2004	182
2005	170
2006	250
2007	174
2008	284
2009	332
2010	129
2011	416
2012	231
2013	172
2014	324
2015	204
2016	170
2017	174
2018	398
2019	251
2020	283
2021	211
2022	146
2023	254
2024	171
2025	203
2026	125

Read against the river

Box Canyon and Yellowstone River at Corwin Springs MT both sit in this drainage area, and their records overlap by 46 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 Yellowstone and what each holds
Gauge	Measures	Values	Record
Yellowstone River at Corwin Springs MT	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	392	1889–2026
Yellowstone River near Livingston, MT	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	331	1897–2026
Sweet Grass Creek above Melville MT	catchment area, annual maximum river flow	47	1914–2026
Boulder River near Contact MT	catchment area, annual maximum river flow	36	1910–2026
East Boulder River nr Mcleod	catchment area, annual maximum river flow	5	1908–2026

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 — 10070002. 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
Yellowstone River at Corwin Springs MT	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
Yellowstone River near Livingston, MT	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
Sweet Grass Creek above Melville MT	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
Boulder River near Contact MT	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
East Boulder River nr Mcleod	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 4 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	2	no
Years spanned	138	yes, 20 or more
Values held	2,714	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-06191500.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 Yellowstone gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-yellowstone/

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 Yellowstone 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 confidence2024-06-10

Source: USGS — National Water Information System, USGS site 06191500, 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.