Huntington Lk — storage

Storage now, against this reservoir's own record

85.29 Mm³

Stored, September 2025

16th

Percentile among 99 Seps on record

-12.8%

Against the Sep 1991–2020 average

-8.5%

Change over the 12 months to 2025-09

Storage in September 2025 was lower than most Seps on record, ranked against 99 other Seps held for this reservoir.

Storage, 1926–2025

Monthly mean storage

1,188 monthly values, 1926 to 2025

Monthly means of the publisher's daily record. Volume, not percentage of capacity — see below for why.

What the shaded periods are (0 events)

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

240 of 1,188 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 1,188 would be longer than this page and unusable with a screen reader.
Period	Huntington Lk Nr Big Creek CA (Mm³)
October 1926	78.7
March 1927	18.3
August 1927	108
January 1928	47.9
June 1928	109
November 1928	48.7
April 1929	5.25
September 1929	107
February 1930	25.0
July 1930	109
December 1930	47.4
May 1931	51.9
October 1931	24.3
March 1932	8.97
August 1932	109
December 1932	73.1
May 1933	30.3
October 1933	108
March 1934	17.7
August 1934	70.2
January 1935	5.48
June 1935	102
November 1935	89.2
April 1936	24.2
September 1936	109
February 1937	8.22
July 1937	83.5
December 1937	47.6
May 1938	58.0
October 1938	83.6
March 1939	43.1
August 1939	86.4
January 1940	56.2
June 1940	107
November 1940	83.7
April 1941	17.3
September 1941	108
February 1942	71.7
July 1942	109
December 1942	78.2
May 1943	61.5
October 1943	107
March 1944	31.5
August 1944	106
January 1945	54.5
May 1945	66.0
October 1945	61.5
March 1946	31.6
August 1946	108
January 1947	82.8
June 1947	104
November 1947	78.3
April 1948	30.5
September 1948	108
February 1949	46.9
July 1949	108
December 1949	72.4
May 1950	53.8
October 1950	98.5
March 1951	78.3
August 1951	109
January 1952	64.6
June 1952	81.0
November 1952	107
April 1953	51.3
September 1953	108
February 1954	47.6
July 1954	109
December 1954	83.9
May 1955	57.7
October 1955	12.4
March 1956	43.2
August 1956	109
January 1957	54.4
June 1957	90.6
October 1957	107
March 1958	35.1
August 1958	109
January 1959	54.2
June 1959	77.0
November 1959	58.4
April 1960	52.2
September 1960	77.7
February 1961	43.0
July 1961	92.1
December 1961	58.4
May 1962	46.3
October 1962	100
March 1963	70.9
August 1963	109
January 1964	84.7
June 1964	85.5
November 1964	12.5
April 1965	15.4
September 1965	108
February 1966	65.2
July 1966	108
December 1966	88.3
May 1967	22.0
October 1967	107
March 1968	62.6
August 1968	92.1
January 1969	78.4
June 1969	71.1
November 1969	84.4
March 1970	76.0
August 1970	107
January 1971	73.9
June 1971	102
November 1971	18.5
April 1972	59.3
September 1972	106
February 1973	85.8
July 1973	109
December 1973	104
May 1974	59.2
October 1974	109
March 1975	74.6
August 1975	108
January 1976	87.8
June 1976	97.7
November 1976	83.6
April 1977	63.3
September 1977	103
February 1978	46.1
July 1978	107
December 1978	104
May 1979	62.6
October 1979	106
March 1980	66.7
August 1980	110
January 1981	102
June 1981	108
November 1981	104
April 1982	39.1
August 1982	110
January 1983	108
June 1983	58.7
November 1983	106
April 1984	56.1
September 1984	108
February 1985	94.1
July 1985	107
December 1985	85.2
May 1986	79.9
October 1986	107
March 1987	56.1
August 1987	106
January 1988	66.0
June 1988	91.4
November 1988	83.2
April 1989	66.9
September 1989	104
February 1990	58.0
July 1990	107
December 1990	73.2
May 1991	28.7
October 1991	95.8
March 1992	56.9
August 1992	107
January 1993	52.5
June 1993	105
November 1993	91.1
April 1994	55.9
September 1994	101
January 1995	57.0
June 1995	87.2
November 1995	86.5
April 1996	53.8
September 1996	107
February 1997	65.6
July 1997	109
December 1997	82.4
May 1998	42.2
October 1998	101
March 1999	52.5
August 1999	109
January 2000	42.1
June 2000	109
November 2000	57.6
April 2001	69.0
September 2001	105
February 2002	44.0
July 2002	108
December 2002	57.7
May 2003	80.7
October 2003	96.9
March 2004	42.9
August 2004	108
January 2005	36.2
June 2005	104
November 2005	80.4
April 2006	36.6
September 2006	108
February 2007	60.2
June 2007	108
November 2007	69.8
April 2008	44.1
September 2008	105
February 2009	67.7
July 2009	108
December 2009	61.3
May 2010	63.7
October 2010	105
March 2011	64.7
August 2011	108
January 2012	61.5
June 2012	106
November 2012	42.1
April 2013	57.1
September 2013	82.7
February 2014	33.1
July 2014	46.9
December 2014	33.5
May 2015	50.6
October 2015	32.1
March 2016	47.6
August 2016	107
January 2017	61.0
June 2017	107
November 2017	86.9
April 2018	75.0
September 2018	96.6
February 2019	41.3
July 2019	108
November 2019	42.8
April 2020	48.0
September 2020	108
February 2021	49.2
July 2021	108
December 2021	50.5
May 2022	98.0
October 2022	47.3
March 2023	37.6
August 2023	108
January 2024	45.4
June 2024	108
November 2024	68.5
April 2025	50.3
September 2025	85.3

The reservoir's year

Seasonal storage profile

Each calendar month's reference average, against the most recent year

1991–2020 average
Most recent 12 months

Twelve separate averages, one per calendar month. A January average describes Januaries only. Months are plotted 1–12.

View the data behind this chart

Underlying data
Period	1991–2020 average (Mm³)	Most recent 12 months (Mm³)
Jan	54.0	52.5
Feb	48.7	49.0
Mar	46.6	39.1
Apr	54.2	50.3
May	80.8	97.1
Jun	102	107
Jul	104	108
Aug	104	108
Sep	97.9	85.3
Oct	83.7	75.8
Nov	71.6	68.5
Dec	61.1	64.6

Why this page shows a volume and not a percentage

Percentage full is a division, and the denominator is missing

“Percentage full” is the figure a drought is discussed in, and it is stored volume divided by capacity. Capacity is published on several different bases — gross, usable, live, and the figure at a particular spillway or licence condition — and dividing a stored volume by the wrong one produces a percentage confidently wrong by the ratio between them, at exactly the moment the number matters most.

Hydrionis holds storage measurements for this reservoir and does not hold a compatible authoritative capacity figure for it, so percentage full is not calculated. The volume above is what was actually measured. Where you need a percentage, take the publisher’s own capacity on its own stated basis and divide it yourself — the source is linked below, and knowing which basis you used is the whole point.

Rate and persistence

-0.66 Mm³

Mean drawdown per month over 12 months

1 of 24

Recent months below the 20th percentile for their own month

Rates are computed only across an unbroken run of months, so a rate is never divided by a period in which some of the change was not observed. Percentile counts compare each month with the same calendar month in every other year held.

Location

Huntington Lk Nr Big Creek CA

Gauge location

About this data

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	1926–2025
Completeness	99.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	Storage is a managed quantity. A falling line can be a rule curve, a scheduled release or a transfer to another system rather than a shortage of water, and nothing here distinguishes them. No capacity figure on a stated basis is held for this reservoir, so no percentage of capacity is computed.
Continuity	99% of the months between 1926 and 2025 are held. Monthly means of the publisher's own daily 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

Use this data

Machine-readable JSON /api/v1/observations/by-subject/reservoir-usgs-11236000.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), Huntington Lk Nr Big Creek CA reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-11236000/

Cite Hydrionis where you rely on the compilation, the normalisation, the eligibility judgements or a chart. Where you use an unmodified published value, the publisher’s attribution is the one that is required; crediting Hydrionis as well is welcome and is not something Hydrionis can require of you.

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 Huntington Lk Nr Big Creek CA record 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 this comes from

1,188 monthly observations 1926–2025 Mm³

Spatially aggregatedHigh confidenceSeptember 2025

Source: USGS — National Water Information System, 11236000. Licence: Open.

Method: Monthly mean of daily reservoir storage published by the USGS in acre-feet and converted to millions of cubic metres. Months with fewer than 20 days of record are not published rather than averaged from a partial month.

Reservoir storage is managed as well as observed: a drawdown may reflect an operating rule, flood-control rule curve or scheduled release rather than a shortage. Compare a month against the same month in other years, and do not read a fall as a supply signal without knowing the operating regime.

Retrieved 1 October 2026.

Monthly mean of daily reservoir storage published by the USGS in acre-feet and converted to millions of cubic metres. Months with fewer than 20 days of record are not published rather than averaged from a partial month.