The monitoring network within this area

Hydrionis holds 963 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

963

Values held

1890–2026

Record spans

Gauges within the Sun 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 Muddy Creek at Vaughn MT

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1925–2025.

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	Muddy Creek at Vaughn MT (m³/s)
1925	17.0
1934	9.46
1935	10.1
1936	8.27
1937	9.80
1939	11.1
1940	9.54
1941	12.1
1942	9.23
1943	27.2
1944	9.94
1945	9.43
1946	22.7
1947	51.0
1948	41.6
1949	12.5
1950	14.7
1951	12.4
1952	13.5
1953	215
1954	20.4
1955	10.9
1956	11.6
1957	25.3
1958	30.3
1959	19.5
1960	14.0
1961	17.9
1962	15.0
1963	15.5
1964	106
1965	39.4
1966	28.9
1967	12.7
1968	19.2
1971	14.1
1972	19.3
1973	12.6
1974	21.8
1975	108
1976	22.6
1977	14.6
1978	64.8
1980	47.6
1981	111
1982	31.7
1983	23.9
1984	23.8
1985	18.0
1986	14.4
1987	23.6
1988	17.9
1989	41.9
1990	15.0
1991	30.0
1992	19.5
1993	12.1
1994	10.3
1995	24.3
1996	13.8
1997	17.1
1998	25.9
1999	12.1
2000	18.4
2001	16.4
2002	49.3
2003	12.4
2004	13.8
2005	21.5
2006	56.6
2007	12.7
2008	19.2
2009	15.4
2010	27.0
2011	26.6
2012	12.8
2013	15.1
2014	21.6
2015	14.9
2016	11.1
2017	15.0
2018	20.2
2019	15.8
2020	20.6
2021	15.1
2022	16.8
2023	12.9
2024	12.4
2025	10.3

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	1925–2025
Completeness	88.1% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	4 separate periods inside 1925–2025 hold no value. The longest runs from 1926 to 1933 — 8 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1925 and is not continuous from it: 101 years separate the first value from the last, and 88% 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 Muddy Creek at Vaughn 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. 1935–2025.

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	Muddy Creek at Vaughn MT (mm)
1935	99.0
1936	82.0
1937	104
1938	118
1939	122
1940	126
1941	120
1942	151
1943	150
1944	125
1945	129
1946	159
1947	166
1948	168
1949	159
1950	164
1951	153
1952	190
1953	225
1954	182
1955	151
1956	169
1957	182
1958	188
1959	185
1960	163
1961	171
1962	193
1963	193
1964	234
1965	216
1966	222
1967	187
1972	219
1973	159
1974	188
1975	255
1976	207
1977	138
1978	223
1979	218
1980	173
1981	197
1982	209
1983	201
1984	161
1985	146
1986	161
1987	154
1988	140
1989	200
1990	149
1991	165
1992	181
1993	149
1994	125
1995	146
1996	152
1997	175
1998	169
1999	168
2000	159
2001	135
2002	175
2003	131
2004	165
2005	152
2006	159
2007	143
2008	184
2009	189
2010	193
2011	198
2012	176
2013	172
2014	176
2015	147
2016	136
2018	212
2019	182
2020	184
2021	158
2022	168
2023	143
2024	105
2025	88.0

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	1935–2025
Completeness	94.5% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	2 separate periods inside 1935–2025 hold no value. The longest runs from 1968 to 1971 — 4 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1935 and is not continuous from it: 91 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

1 automated snow station sits inside this drainage area, weighing the snowpack rather than measuring how deep it is.

411

Fullest snowpack recorded at Wood Creek, in 1997 (mm of water)

114

Thinnest, in 1984 (mm of water)

April

Month the pack is usually at its fullest

June

Month the pack has gone by, in half of years

Peak snowpack at Wood Creek

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	Wood Creek (mm)
1979	342
1980	261
1981	193
1982	390
1983	208
1984	114
1985	317
1986	212
1987	184
1988	168
1989	257
1990	205
1991	344
1992	216
1993	223
1994	187
1995	163
1996	273
1997	411
1998	172
1999	280
2000	205
2001	200
2002	271
2003	175
2004	199
2005	194
2006	331
2007	187
2008	260
2009	278
2010	116
2011	372
2012	240
2013	157
2014	328
2015	153
2016	141
2017	230
2018	411
2019	214
2020	253
2021	198
2022	231
2023	225
2024	141
2025	140
2026	142

Read against the river

Wood Creek and Muddy Creek at Vaughn 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 Sun and what each holds
Gauge	Measures	Values	Record
Muddy Creek at Vaughn MT	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	298	1925–2026
North Fork Sun River near Augusta MT	catchment area, annual maximum river flow	45	1911–2026
Sun River bl Wagner Basin, nr Augusta, MT	catchment area, annual maximum river flow	28	1890–2026
South Fork Sun River near Augusta MT	catchment area, annual maximum river flow	16	1964–2026

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 — 10030104. 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
Muddy Creek at Vaughn 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
North Fork Sun River near Augusta 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
Sun River bl Wagner Basin, nr Augusta, 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
South Fork Sun River near Augusta 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

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 3 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	1	no
Years spanned	137	yes, 20 or more
Values held	963	no
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-06088500.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), Sun gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-sun/

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 Sun 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 confidence2025-06-21

Source: USGS — National Water Information System, USGS site 06088500, 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.