The monitoring network within this area

Hydrionis holds 3,585 values from 2 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.

2

Gauges

3,585

Values held

1890–2026

Record spans

Gauges within the Upper Carson huc8 subbasin

2 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 E FK CARSON RV NR GARDNERVILLE, NV

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1909–2025.

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	E FK CARSON RV NR GARDNERVILLE, NV (m³/s)
1909	119
1925	94.9
1926	34.8
1927	89.2
1928	72.8
1936	64.8
1937	47.6
1940	73.1
1941	70.2
1943	153
1944	48.7
1945	98.8
1946	55.5
1948	60.0
1949	53.0
1950	68.2
1952	101
1953	62.3
1954	77.3
1955	54.4
1957	66.3
1958	89.5
1959	29.2
1960	32.8
1961	26.5
1962	52.7
1963	379
1964	233
1966	35.4
1967	116
1968	39.4
1969	105
1970	86.6
1971	69.1
1972	43.0
1973	84.4
1975	92.3
1976	25.7
1977	18.1
1978	66.8
1979	77.6
1980	224
1981	40.2
1982	179
1983	218
1985	42.5
1986	209
1987	35.7
1988	17.7
1989	46.2
1990	22.7
1991	38.5
1992	27.1
1993	73.9
1994	31.7
1995	168
1996	200
1997	575
1998	84.1
1999	89.2
2000	57.2
2001	44.5
2002	50.7
2003	89.8
2004	44.7
2005	127
2007	26.1
2008	49.8
2009	59.7
2010	110
2012	57.8
2014	25.5
2015	39.6
2016	53.2
2017	277
2018	166
2019	98.0
2020	43.3
2021	26.9
2022	192
2024	65.4
2025	52.4

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	1909–2025
Completeness	70.1% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	14 separate periods inside 1909–2025 hold no value. The longest runs from 1910 to 1924 — 15 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1909 and is not continuous from it: 117 years separate the first value from the last, and 70% 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 E FK CARSON RV NR GARDNERVILLE, NV, 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	E FK CARSON RV NR GARDNERVILLE, NV (mm)
1890	926
1891	578
1892	594
1893	819
1901	549
1902	289
1903	448
1908	239
1909	544
1910	379
1925	365
1926	189
1927	437
1936	338
1940	368
1941	357
1942	464
1943	428
1944	243
1945	428
1946	332
1947	227
1948	250
1949	264
1950	513
1951	302
1952	616
1953	337
1954	263
1955	283
1956	527
1957	297
1958	453
1959	190
1960	172
1961	158
1962	321
1963	444
1964	259
1965	465
1966	249
1967	544
1968	246
1969	667
1970	389
1971	379
1972	271
1973	386
1974	426
1975	413
1976	136
1977	89.0
1978	389
1979	327
1980	509
1981	235
1982	665
1983	849
1984	421
1985	252
1986	582
1987	151
1988	119
1989	284
1990	147
1991	179
1992	128
1993	442
1994	161
1995	722
1996	527
1997	553
1998	482
1999	423
2000	274
2001	191
2002	251
2003	298
2004	252
2005	491
2006	556
2007	156
2008	214
2009	311
2010	392
2011	594
2012	177
2013	182
2014	136
2015	118
2016	348
2017	1,000
2018	326
2019	530
2020	176
2021	161
2022	249
2023	937
2024	318
2025	275

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	73.5% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	5 separate periods inside 1890–2025 hold no value. The longest runs from 1911 to 1924 — 14 years with no reading. They are drawn as breaks in the line and are 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 74% 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

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

1,997

Fullest snowpack recorded at Ebbetts Pass, in 2017 (mm of water)

313

Thinnest, in 2015 (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 Ebbetts Pass

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	Ebbetts Pass (mm)
1979	990
1980	1,527
1981	681
1982	1,504
1983	1,577
1984	972
1985	706
1986	1,424
1987	380
1988	475
1989	698
1990	433
1991	545
1992	515
1993	1,242
1994	467
1995	1,894
1996	1,140
1997	1,290
1998	1,347
1999	1,210
2000	786
2001	590
2002	809
2003	908
2004	910
2005	1,129
2006	1,557
2007	400
2008	723
2009	807
2010	917
2011	1,359
2012	387
2013	630
2014	368
2015	313
2016	831
2017	1,997
2018	691
2019	1,519
2020	624
2021	608
2022	475
2023	1,943
2024	804
2025	634
2026	427

Read against the river

Ebbetts Pass and W FK CARSON RV AT WOODFORDS, CA 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 Carson and what each holds
Gauge	Measures	Values	Record
E FK CARSON RV NR GARDNERVILLE, NV	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	330	1890–2026
W FK CARSON RV AT WOODFORDS, CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	315	1890–2026

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 — 16050201. 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
E FK CARSON RV NR GARDNERVILLE, NV	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
W FK CARSON RV AT WOODFORDS, CA	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	137	yes, 20 or more
Values held	3,585	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-10309000.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 Carson gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-carson/

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 Carson 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 confidence2025-05-11

Source: USGS — National Water Information System, USGS site 10309000, 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.