The monitoring network within this area

Hydrionis holds 1,038 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.

Gauges

1,038

Values held

1905–2026

Record spans

Gauges within the Upper Stanislaus 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 NF STANISLAUS R NR AVERY CA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1915–2025.

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	NF STANISLAUS R NR AVERY CA (m³/s)
1915	176
1916	78.2
1917	69.4
1918	55.5
1919	60.9
1920	53.2
1921	58.3
1922	107
1929	85.0
1930	63.1
1931	28.6
1932	133
1933	101
1934	56.6
1935	112
1936	165
1937	142
1939	50.7
1940	259
1941	163
1942	138
1943	317
1944	76.2
1945	320
1946	106
1947	65.7
1948	129
1949	98.3
1950	108
1952	170
1953	283
1954	210
1955	70.2
1957	405
1958	172
1959	63.1
1960	91.2
1961	37.4
1962	106
1963	1,019
1964	821
1966	56.6
1967	222
1968	62.9
1969	187
1970	360
1971	103
1972	55.5
1973	151
1975	170
1977	17.0
1978	141
1979	117
1980	711
1981	70.5
1982	640
1983	408
1985	70.2
1986	623
1987	30.0
1988	24.2
1989	68.5
1991	64.8
1992	24.2
1993	69.7
1995	300
1996	379
1997	1,008
1998	135
1999	69.1
2000	102
2001	34.0
2002	45.9
2003	51.3
2004	38.5
2005	220
2007	44.5
2008	32.3
2009	167
2010	58.9
2011	175
2012	112
2014	37.4
2015	323
2016	136
2017	784
2018	385
2019	150
2020	41.1
2021	15.0
2022	311
2024	61.2
2025	56.4

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	1915–2025
Completeness	83.8% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	13 separate periods inside 1915–2025 hold no value. The longest runs from 1923 to 1928 — 6 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1915 and is not continuous from it: 111 years separate the first value from the last, and 84% 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 NF STANISLAUS R NR AVERY 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. 1915–2024.

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	NF STANISLAUS R NR AVERY CA (mm)
1915	1,027
1916	1,396
1917	964
1918	658
1919	595
1920	712
1921	1,025
1922	1,027
1923	751
1924	134
1929	461
1930	613
1931	273
1932	1,002
1933	540
1934	391
1935	956
1936	1,051
1937	1,040
1938	1,450
1939	415
1940	1,100
1941	1,130
1942	1,165
1943	1,072
1944	577
1945	1,015
1946	847
1947	518
1948	762
1949	612
1950	1,571
1951	668
1952	1,429
1953	824
1954	695
1955	801
1956	1,235
1957	761
1958	1,230
1959	477
1960	536
1961	368
1962	869
1963	1,082
1964	868
1965	1,172
1966	643
1967	1,300
1968	574
1969	1,622
1970	1,024
1971	857
1972	665
1973	1,072
1974	1,092
1975	1,000
1976	255
1977	154
1978	1,200
1979	847
1980	1,405
1981	739
1982	1,775
1983	2,301
1984	893
1985	565
1986	1,424
1987	276
1988	312
1989	507
1990	468
1991	489
1992	396
1993	1,081
1994	419
1995	1,764
1996	1,344
1997	1,372
1998	1,379
1999	1,083
2000	872
2001	462
2002	599
2003	826
2004	620
2005	1,489
2006	1,548
2007	531
2008	558
2009	762
2010	992
2011	1,722
2012	584
2013	443
2014	393
2015	347
2016	817
2017	2,293
2018	740
2019	1,454
2020	592
2021	406
2022	542
2023	1,758
2024	881

About this series

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	1915–2024
Completeness	96.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1915–2024 holds no value: 1925 to 1928, 4 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1915 and is not continuous from it: 110 years separate the first value from the last, and 96% 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

Every gauge Hydrionis holds within this area

Gauges within the Upper Stanislaus and what each holds
Gauge	Measures	Values	Record
NF STANISLAUS R NR AVERY CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	356	1914–2026
S SAN JOAQUIN CN NR KNIGHTS FERRY CA	burned area within 50 km, mean river flow, mean river flow, water year	245	1914–2024
OAKDALE CN NR KNIGHTS FERRY CA	burned area within 50 km, mean river flow, mean river flow, water year	243	1914–2024
MF STANISLAUS R A SBF NR AVERY CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	194	1905–2026

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 — 18040010. 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
NF STANISLAUS R NR AVERY 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
S SAN JOAQUIN CN NR KNIGHTS FERRY 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
OAKDALE CN NR KNIGHTS FERRY 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
MF STANISLAUS R A SBF NR AVERY 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 5 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	4	yes, 3 or more
Years spanned	122	yes, 20 or more
Values held	1,038	yes, 1000 or more
Distinct measurements	5	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-11294500.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 Stanislaus gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-stanislaus/

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 Stanislaus 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 confidence2025-02-07

Source: USGS — National Water Information System, USGS site 11294500, 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.