Piute Reservoir, UT — storage

Storage now, against this reservoir's own record

7.49 Mm³

Stored, September 1975

35th

Percentile among 58 Seps on record

Storage in September 1975 was around the middle of the Sep record, ranked against 58 other Seps held for this reservoir.

No percentage departure from the Sep average is published here. No long-term average is held for this month, so there is nothing to compare with.

Storage, 1914–1975

Monthly mean storage

703 monthly values, 1914 to 1975

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 703 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 703 would be longer than this page and unusable with a screen reader.
Period	Piute Reservoir Near Marysvale, UT (Mm³)
April 1914	53.4
July 1914	58.5
October 1914	6.69
January 1915	14.5
April 1915	46.7
July 1915	36.3
October 1915	9.37
January 1916	37.1
March 1916	58.1
June 1916	43.2
September 1916	10.2
December 1916	0.053
March 1917	31.9
June 1917	65.4
September 1917	15.8
December 1917	19.5
March 1918	64.3
June 1918	36.7
September 1918	0.028
December 1918	16.1
March 1919	51.7
June 1919	33.2
September 1919	0.228
December 1919	16.6
February 1920	36.5
May 1920	64.7
August 1920	45.5
November 1920	16.8
February 1921	55.9
May 1921	56.9
August 1921	40.2
November 1921	20.0
February 1922	56.0
May 1922	94.0
August 1922	51.4
November 1922	41.8
February 1923	67.0
May 1923	78.8
August 1923	31.8
November 1923	10.6
January 1924	33.4
April 1924	71.5
July 1924	8.70
October 1924	3.53
January 1925	32.7
April 1925	56.4
July 1925	12.4
October 1925	3.35
January 1926	28.6
April 1926	50.4
July 1926	14.3
October 1926	1.63
January 1927	19.4
April 1927	46.1
July 1927	16.0
October 1927	10.2
December 1927	19.9
March 1928	57.0
June 1928	37.1
September 1928	0
December 1928	11.1
March 1929	41.4
June 1929	48.6
September 1929	22.0
December 1929	30.1
March 1930	59.7
June 1930	37.3
September 1930	9.05
December 1930	28.1
March 1931	57.5
June 1931	19.2
September 1931	0
November 1931	3.36
February 1932	28.3
May 1932	52.7
August 1932	26.2
November 1932	8.06
February 1933	33.6
May 1933	42.2
August 1933	6.43
November 1933	5.66
February 1934	23.7
May 1934	14.5
August 1934	0
November 1934	0
February 1935	24.1
May 1935	29.2
August 1935	11.1
October 1935	2.84
January 1936	23.5
April 1936	47.6
July 1936	28.2
October 1936	9.89
January 1937	26.8
April 1937	64.4
July 1937	75.2
October 1937	39.7
January 1938	66.6
April 1938	96.7
July 1938	71.4
October 1938	0.114
January 1939	45.1
April 1939	76.6
July 1939	22.3
September 1939	19.5
December 1939	29.0
March 1940	59.7
June 1940	44.9
September 1940	7.91
December 1940	27.0
March 1941	57.8
June 1941	90.2
September 1941	37.4
December 1941	68.0
March 1942	73.8
June 1942	85.5
September 1942	22.8
December 1942	51.6
March 1943	86.5
June 1943	56.3
August 1943	24.3
November 1943	22.8
February 1944	57.0
May 1944	85.0
August 1944	41.7
November 1944	29.8
February 1945	67.4
May 1945	86.2
August 1945	45.2
November 1945	35.1
February 1946	68.3
May 1946	77.5
August 1946	21.5
November 1946	22.0
February 1947	57.3
May 1947	81.0
July 1947	67.5
October 1947	8.77
January 1948	53.5
April 1948	86.4
July 1948	46.5
October 1948	3.25
January 1949	38.8
April 1949	75.3
July 1949	73.0
October 1949	12.8
January 1950	49.0
April 1950	78.5
July 1950	36.8
October 1950	0.877
January 1951	31.1
April 1951	54.1
June 1951	28.8
September 1951	4.40
December 1951	18.0
March 1952	47.0
June 1952	90.3
September 1952	35.2
December 1952	45.1
March 1953	83.0
June 1953	50.8
September 1953	11.1
December 1953	21.6
March 1955	42.7
August 1955	6.32
March 1956	31.8
June 1956	17.1
December 1956	8.78
February 1957	23.6
May 1957	20.3
August 1957	9.87
November 1957	16.8
February 1958	48.0
May 1958	81.8
August 1958	35.9
November 1958	34.0
February 1959	66.1
May 1959	42.9
August 1959	12.9
November 1959	6.05
February 1960	32.5
May 1960	16.1
August 1960	3.45
November 1960	1.62
January 1961	18.3
April 1961	26.5
July 1961	2.48
October 1961	7.64
January 1962	20.9
April 1962	59.2
July 1962	28.2
October 1962	4.72
January 1963	24.9
April 1963	23.8
July 1963	10.1
October 1963	3.27
January 1964	17.6
April 1964	31.2
July 1964	18.9
October 1964	7.21
December 1964	16.1
March 1965	36.6
June 1965	38.6
September 1965	21.0
December 1965	30.1
March 1966	65.6
June 1966	51.6
September 1966	17.9
December 1966	38.4
March 1967	59.8
June 1967	52.1
September 1967	24.2
December 1967	50.7
March 1968	68.1
June 1968	71.7
September 1968	31.3
November 1968	35.4
February 1969	71.6
June 1969	88.1
September 1969	42.6
December 1969	68.4
March 1970	87.1
July 1970	40.6
November 1970	21.7
February 1971	56.8
May 1971	51.9
August 1971	19.9
December 1971	45.5
March 1972	79.0
August 1972	12.0
November 1972	23.4
February 1973	52.5
April 1973	72.3
August 1973	50.2
November 1973	37.5
February 1974	67.8
May 1974	70.8
August 1974	14.1
June 1975	46.1
September 1975	7.49

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 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

Piute Reservoir Near Marysvale, UT

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	1914–1975
Completeness	94.5% 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	94% of the months between 1914 and 1975 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-10191000.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), Piute Reservoir Near Marysvale, UT reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-10191000/

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 Piute Reservoir Near Marysvale, UT 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

703 monthly observations 1914–1975 Mm³

Spatially aggregatedHigh confidenceSeptember 1975

Source: USGS — National Water Information System, 10191000. 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.