The monitoring network within this area

Hydrionis holds 2,381 values from 3 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.

3

Gauges

2,381

Values held

1909–2026

Record spans

Gauges within the Upper Virgin huc8 subbasin

3 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 VIRGIN RIVER AT VIRGIN, UT

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1910–2025.

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	VIRGIN RIVER AT VIRGIN, UT (m³/s)
1910	78.4
1911	300
1912	144
1914	70.8
1915	123
1916	123
1918	144
1920	311
1921	75.0
1922	96.3
1923	144
1924	87.8
1925	47.0
1927	122
1929	119
1930	85.0
1932	255
1933	66.5
1934	43.9
1935	49.8
1936	178
1937	54.4
1938	382
1939	283
1940	124
1941	84.4
1943	26.0
1944	30.3
1945	23.9
1946	48.1
1948	39.6
1949	28.6
1950	187
1951	79.3
1953	365
1954	133
1955	300
1956	64.0
1957	40.5
1958	210
1959	125
1960	62.0
1961	382
1962	87.8
1963	129
1964	131
1965	195
1966	646
1968	194
1969	388
1970	75.3
1971	81.6
1979	215
1980	306
1981	103
1982	275
1984	130
1985	82.7
1986	45.9
1987	204
1989	42.5
1990	85.5
1991	42.2
1992	121
1993	122
1994	91.7
1995	220
1997	157
1998	210
1999	157
2000	26.7
2002	97.4
2004	30.3
2005	279
2006	127
2007	228
2008	105
2009	26.6
2010	76.7
2012	154
2013	64.8
2014	178
2015	103
2017	101
2018	116
2019	162
2020	60.3
2021	69.4
2023	147
2024	52.4
2025	25.8

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	1910–2025
Completeness	78.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	19 separate periods inside 1910–2025 hold no value. The longest runs from 1972 to 1978 — 7 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1910 and is not continuous from it: 116 years separate the first value from the last, and 78% 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 VIRGIN RIVER AT VIRGIN, UT, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1910–2025.

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	VIRGIN RIVER AT VIRGIN, UT (mm)
1910	105
1911	161
1912	78.0
1913	69.0
1914	102
1915	102
1916	139
1917	77.0
1918	87.0
1919	66.0
1920	88.0
1921	89.0
1922	190
1923	100
1924	49.0
1925	54.0
1926	67.0
1927	83.0
1928	48.0
1929	69.0
1930	60.0
1931	37.0
1932	116
1933	54.0
1934	41.0
1935	70.0
1936	59.0
1937	107
1938	100
1939	60.0
1940	63.0
1941	130
1942	79.0
1943	64.0
1944	70.0
1945	62.0
1946	46.0
1947	54.0
1948	43.0
1949	63.0
1950	48.0
1951	42.0
1952	100
1953	43.0
1954	57.0
1955	45.0
1956	37.0
1957	56.0
1958	101
1959	39.0
1960	41.0
1961	42.0
1962	66.0
1963	40.0
1964	46.0
1965	69.0
1966	71.0
1967	65.0
1968	68.0
1969	127
1970	51.0
1979	131
1980	143
1981	55.0
1982	68.0
1983	141
1984	55.0
1985	77.0
1986	57.0
1987	52.0
1988	60.0
1989	39.0
1990	35.0
1991	40.0
1992	51.0
1993	133
1994	47.0
1995	110
1996	42.0
1997	55.0
1998	96.0
1999	46.0
2000	47.0
2001	47.0
2002	32.0
2003	37.0
2004	53.0
2005	179
2006	59.0
2007	39.0
2008	47.0
2009	46.0
2010	91.0
2011	117
2012	41.0
2013	45.0
2014	39.0
2015	40.0
2016	57.0
2017	78.0
2018	40.0
2019	100
2020	47.0
2021	38.0
2022	44.0
2023	123
2024	48.0
2025	36.0

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	1910–2025
Completeness	93.1% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1910–2025 holds no value: 1971 to 1978, 8 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1910 and is not continuous from it: 116 years separate the first value from the last, and 93% 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.

1,378

Fullest snowpack recorded at Kolob, in 2005 (mm of water)

233

Thinnest, in 2002 (mm of water)

March

Month the pack is usually at its fullest

June

Month the pack has gone by, in half of years

Peak snowpack at Kolob

Water years 1980–2026. 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	Kolob (mm)
1980	944
1981	346
1982	660
1983	1,141
1984	434
1985	532
1986	503
1987	374
1988	498
1989	390
1990	335
1991	519
1992	608
1993	1,017
1994	405
1995	1,005
1996	403
1997	521
1998	865
1999	288
2000	489
2001	551
2002	233
2003	328
2004	415
2005	1,378
2006	507
2007	259
2008	642
2009	637
2010	788
2011	1,043
2012	298
2013	387
2014	299
2015	322
2016	476
2017	633
2018	264
2019	797
2020	621
2021	311
2022	439
2023	1,203
2024	442
2025	298
2026	279

Read against the river

Kolob and VIRGIN RIVER AT VIRGIN, UT both sit in this drainage area, and their records overlap by 45 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 Virgin and what each holds
Gauge	Measures	Values	Record
VIRGIN RIVER AT VIRGIN, UT	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	362	1909–2026
NORTH FORK VIRGIN RIVER NEAR SPRINGDALE, UT	catchment area, annual maximum river flow	103	1913–2026
SANTA CLARA RIVER NEAR CENTRAL, UTAH	catchment area, annual maximum river flow	46	1909–2026

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 — 15010008. 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
VIRGIN RIVER AT VIRGIN, UT	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 VIRGIN RIVER NEAR SPRINGDALE, UT	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
SANTA CLARA RIVER NEAR CENTRAL, UTAH	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	118	yes, 20 or more
Values held	2,381	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-09406000.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 Virgin gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-virgin/

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 Virgin 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 confidence2025-08-27

Source: USGS — National Water Information System, USGS site 09406000, 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.