Scofield Reservoir, UT — storage

Storage now, against this reservoir's own record

14.97 Mm³

Stored, September 2003

26th

Percentile among 59 Seps on record

+43.1%

Change over the 12 months to 2003-09

Storage in September 2003 was lower than most Seps on record, ranked against 59 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, 1942–2003

Monthly mean storage

656 monthly values, 1942 to 2003

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 656 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 656 would be longer than this page and unusable with a screen reader.
Period	Scofield Reservoir Near Scofield, UT (Mm³)
April 1942	30.4
July 1942	28.6
September 1942	9.93
March 1943	10.9
June 1943	30.6
September 1943	7.21
June 1944	37.2
September 1944	8.82
July 1945	30.4
May 1946	27.0
July 1946	14.5
October 1946	1.64
April 1947	14.2
July 1947	34.9
September 1947	19.1
December 1947	13.7
March 1948	18.1
June 1948	29.7
August 1948	6.54
May 1949	33.5
August 1949	36.8
November 1949	23.8
January 1950	27.4
April 1950	35.1
July 1950	57.2
October 1950	31.8
December 1950	33.5
March 1951	38.9
June 1951	65.5
August 1951	45.3
November 1951	32.0
July 1952	76.7
October 1952	55.3
April 1953	64.3
July 1953	63.9
October 1953	36.0
January 1954	38.4
March 1954	41.5
June 1954	35.3
September 1954	10.0
December 1954	9.19
February 1955	11.8
May 1955	26.9
August 1955	13.6
November 1955	3.06
January 1956	6.16
April 1956	13.1
July 1956	22.1
October 1956	1.70
December 1956	2.42
March 1957	6.68
June 1957	56.5
September 1957	50.3
November 1957	44.8
February 1958	48.6
May 1958	66.1
July 1958	70.9
October 1958	40.5
January 1959	40.0
April 1959	44.4
June 1959	38.6
September 1959	11.9
December 1959	7.05
March 1960	8.84
May 1960	18.8
August 1960	4.58
November 1960	2.53
February 1961	2.69
April 1961	6.38
July 1961	2.83
October 1961	1.07
January 1962	1.88
March 1962	3.64
June 1962	51.2
September 1962	23.0
December 1962	20.9
February 1963	21.9
May 1963	32.3
August 1963	18.8
November 1963	12.2
January 1964	12.1
April 1964	16.2
July 1964	40.4
September 1964	17.5
December 1964	12.9
March 1965	17.8
June 1965	67.8
August 1965	71.9
November 1965	61.0
February 1966	64.8
May 1966	83.0
July 1966	67.8
October 1966	42.2
January 1967	44.1
April 1967	50.8
June 1967	85.5
September 1967	60.1
December 1967	54.5
March 1968	58.5
May 1968	74.2
August 1968	71.0
November 1968	52.3
February 1969	56.7
April 1969	47.6
July 1969	78.7
October 1969	57.0
January 1970	60.3
March 1970	64.1
June 1970	85.1
September 1970	52.1
November 1970	48.0
February 1971	52.1
May 1971	75.6
August 1971	58.7
October 1971	45.9
January 1972	48.7
April 1972	57.7
July 1972	49.7
September 1972	26.2
December 1972	26.6
March 1973	29.3
June 1973	85.4
August 1973	67.0
November 1973	49.8
February 1974	53.9
May 1974	74.1
July 1974	65.8
October 1974	39.2
January 1975	39.5
April 1975	43.4
June 1975	83.1
September 1975	57.8
December 1975	52.7
February 1976	54.5
May 1976	69.4
August 1976	47.1
November 1976	37.0
January 1977	35.7
April 1977	37.7
July 1977	27.7
October 1977	21.4
December 1977	21.3
March 1978	22.7
June 1978	74.8
September 1978	48.5
November 1978	45.5
February 1979	50.2
May 1979	61.0
August 1979	64.1
October 1979	49.6
January 1980	52.2
April 1980	51.6
July 1980	79.8
September 1980	59.7
December 1980	59.2
March 1981	62.9
June 1981	66.3
August 1981	43.3
November 1981	38.4
February 1982	43.3
April 1982	48.1
July 1982	80.8
October 1982	60.4
January 1983	66.0
March 1983	50.7
June 1983	91.9
September 1983	67.9
December 1983	55.1
February 1984	60.9
September 1984	67.6
December 1984	55.5
March 1985	64.7
May 1985	83.1
August 1985	63.0
November 1985	52.2
February 1986	58.9
April 1986	54.5
July 1986	78.9
October 1986	55.4
January 1987	61.5
March 1987	66.6
June 1987	73.5
September 1987	47.3
December 1987	45.3
February 1988	49.6
May 1988	65.5
August 1988	43.1
October 1988	33.0
January 1989	36.3
April 1989	44.5
July 1989	29.1
September 1989	15.4
December 1989	13.5
March 1990	15.8
June 1990	26.5
August 1990	12.4
November 1993	38.9
February 1994	42.6
May 1994	49.8
July 1994	32.8
October 1994	13.4
January 1995	16.2
April 1995	26.0
June 1995	71.8
September 1995	43.7
December 1995	35.9
March 1996	37.5
May 1996	38.7
August 1996	32.1
November 1996	20.7
February 1997	27.8
April 1997	24.9
July 1997	76.1
October 1997	50.5
December 1997	51.3
March 1998	56.8
June 1998	85.8
September 1998	58.6
November 1998	51.3
February 1999	54.5
May 1999	68.7
August 1999	66.7
October 1999	50.9
January 2000	50.2
April 2000	58.6
July 2000	49.6
September 2000	32.6
December 2000	33.6
March 2001	38.8
June 2001	54.5
August 2001	36.0
November 2001	27.7
February 2002	32.2
May 2002	42.3
July 2002	25.5
October 2002	11.1
January 2003	17.5
April 2003	26.8
June 2003	40.9
September 2003	15.0

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

+0.38 Mm³

Mean change per month over 12 months

5 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

Scofield Reservoir Near Scofield, 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	1942–2003
Completeness	88.2% 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	88% of the months between 1942 and 2003 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-09311000.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), Scofield Reservoir Near Scofield, UT reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-09311000/

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 Scofield Reservoir Near Scofield, 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

656 monthly observations 1942–2003 Mm³

Spatially aggregatedHigh confidenceSeptember 2003

Source: USGS — National Water Information System, 09311000. 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.