The monitoring network within this area

Hydrionis holds 953 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

953

Values held

1911–2026

Record spans

Gauges within the East Walker 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 E WALKER RV NR BRIDGEPORT, CA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1924–2025.

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 WALKER RV NR BRIDGEPORT, CA (m³/s)
1924	15.6
1925	14.5
1936	14.4
1941	18.5
1942	19.1
1943	35.1
1944	10.4
1945	24.2
1950	7.99
1951	20.2
1952	27.9
1953	13.5
1954	9.29
1956	27.8
1958	25.0
1962	13.8
1963	39.4
1964	8.55
1965	15.1
1967	38.5
1968	7.28
1969	29.7
1970	24.4
1971	20.4
1972	9.68
1973	18.9
1974	20.6
1975	16.7
1976	7.90
1977	8.04
1978	14.6
1979	18.5
1980	39.1
1981	9.40
1982	30.6
1983	31.4
1984	18.9
1985	8.89
1986	38.8
1987	9.85
1988	4.90
1989	8.27
1991	5.83
1992	3.88
1993	10.5
1995	33.1
1996	21.7
1997	54.1
1998	24.5
1999	20.9
2000	8.66
2001	6.97
2002	7.76
2003	7.19
2004	7.67
2005	25.9
2006	26.8
2008	7.84
2009	10.7
2010	11.2
2011	26.4
2012	6.14
2013	4.62
2014	2.72
2015	5.32
2016	6.97
2017	44.2
2018	17.5
2019	21.9
2021	2.86
2022	4.64
2023	37.7
2024	11.9
2025	4.87

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	1924–2025
Completeness	72.5% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	11 separate periods inside 1924–2025 hold no value. The longest runs from 1926 to 1935 — 10 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1924 and is not continuous from it: 102 years separate the first value from the last, and 73% 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 WALKER RV NR BRIDGEPORT, CA, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1923–2025.

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 WALKER RV NR BRIDGEPORT, CA (mm)
1923	149
1926	95.0
1927	127
1928	107
1929	71.0
1930	67.0
1931	38.0
1932	103
1933	105
1934	62.0
1935	99.0
1936	135
1937	160
1938	347
1939	97.0
1940	100
1941	166
1942	192
1943	176
1944	120
1945	172
1946	150
1947	101
1948	75.0
1949	83.0
1950	94.0
1951	117
1952	274
1953	128
1954	106
1955	71.0
1956	232
1957	128
1958	211
1959	95.0
1960	63.0
1961	41.0
1962	115
1963	181
1964	91.0
1965	172
1966	117
1967	234
1968	109
1969	335
1970	150
1971	136
1972	105
1973	148
1974	161
1975	164
1976	69.0
1977	40.0
1978	158
1979	172
1980	240
1981	112
1982	298
1983	425
1984	190
1985	136
1986	270
1987	96.0
1988	52.0
1989	79.0
1990	55.0
1991	52.0
1992	44.0
1993	134
1994	65.0
1995	250
1996	223
1997	297
1998	267
1999	177
2000	114
2001	78.0
2002	64.0
2003	93.0
2004	91.0
2005	209
2006	285
2007	70.0
2008	81.0
2009	99.0
2010	125
2011	258
2012	75.0
2013	52.0
2014	37.0
2015	31.0
2016	83.0
2017	410
2018	151
2019	209
2020	68.0
2021	43.0
2022	60.0
2023	433
2024	141
2025	72.0

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	1923–2025
Completeness	98.1% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1923–2025 holds no value: 1924 to 1925, 2 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1923 and is not continuous from it: 103 years separate the first value from the last, and 98% 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.

1,331

Fullest snowpack recorded at Virginia Lakes Ridge, in 2023 (mm of water)

99

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 Virginia Lakes Ridge

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	Virginia Lakes Ridge (mm)
1979	521
1980	783
1981	306
1982	816
1983	1,034
1984	599
1985	394
1986	801
1987	187
1988	189
1989	370
1990	204
1991	321
1992	244
1993	783
1994	194
1995	805
1996	582
1997	715
1998	703
1999	438
2000	364
2001	298
2002	347
2003	452
2004	397
2005	881
2006	857
2007	190
2008	494
2009	354
2010	431
2011	680
2012	173
2013	295
2014	184
2015	99.0
2016	388
2017	981
2018	288
2019	674
2020	241
2021	258
2022	267
2023	1,331
2024	404
2025	398
2026	297

Read against the river

Virginia Lakes Ridge and E WALKER RV NR BRIDGEPORT, 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 East Walker and what each holds
Gauge	Measures	Values	Record
E WALKER RV NR BRIDGEPORT, CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	319	1922–2026
BUCKEYE CK NR BRIDGEPORT, CA	catchment area, annual maximum river flow	49	1954–2026
E WALKER RV NR MASON, NV	catchment area, annual maximum river flow	10	1911–2026

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 — 16050301. 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 WALKER RV NR BRIDGEPORT, 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
BUCKEYE CK NR BRIDGEPORT, 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
E WALKER RV NR MASON, 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

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	116	yes, 20 or more
Values held	953	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-10293000.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), East Walker gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-east-walker/

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 East Walker 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 confidence2025-06-10

Source: USGS — National Water Information System, USGS site 10293000, 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.