Lk Arlington, TX — storage

Storage now, against this reservoir's own record

22.65 Mm³

Stored, September 1998

0th

Percentile among 42 Seps on record

-21.1%

Change over the 12 months to 1998-09

Storage in September 1998 was lower than almost every other Sep on record, ranked against 42 other Seps held for this reservoir. It is the lowest in the held record for this month.

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, 1957–1998

Monthly mean storage

498 monthly values, 1957 to 1998

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 498 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 498 would be longer than this page and unusable with a screen reader.
Period	Lk Arlington At Arlington, TX (Mm³)
April 1957	13.3
June 1957	57.5
August 1957	53.1
October 1957	55.1
December 1957	56.7
February 1958	56.4
April 1958	57.5
July 1958	55.5
September 1958	54.2
November 1958	56.1
January 1959	55.8
March 1959	55.6
May 1959	55.9
July 1959	55.9
September 1959	51.7
November 1959	56.0
January 1960	57.1
March 1960	56.2
May 1960	55.8
August 1960	51.2
October 1960	47.2
December 1960	45.7
February 1961	51.7
April 1961	55.7
June 1961	55.7
August 1961	53.7
October 1961	51.2
December 1961	50.7
February 1962	50.0
April 1962	49.9
June 1962	49.4
August 1962	50.6
November 1962	53.7
January 1963	53.4
March 1963	52.5
May 1963	55.8
July 1963	52.4
September 1963	48.0
November 1963	44.4
January 1964	42.6
March 1964	45.3
May 1964	50.1
July 1964	46.3
September 1964	42.6
November 1964	47.9
February 1965	57.5
April 1965	56.3
June 1965	56.1
August 1965	49.4
October 1965	46.5
December 1965	44.9
February 1966	45.7
April 1966	48.2
June 1966	56.2
August 1966	51.7
October 1966	55.9
December 1966	53.2
March 1967	50.3
May 1967	49.0
July 1967	47.3
September 1967	42.3
November 1967	41.1
January 1968	42.1
March 1968	53.7
May 1968	57.3
July 1968	54.1
September 1968	47.9
November 1968	44.2
January 1969	42.4
March 1969	42.7
June 1969	54.7
August 1969	45.5
October 1969	41.9
December 1969	42.5
February 1970	43.8
April 1970	56.8
June 1970	55.7
August 1970	45.7
October 1970	44.1
December 1970	40.6
February 1971	37.1
April 1971	33.4
July 1971	25.4
September 1971	23.5
November 1971	36.6
January 1972	55.7
March 1972	53.0
May 1972	52.9
July 1972	44.7
September 1972	34.5
November 1972	33.7
January 1973	31.6
March 1973	35.5
May 1973	52.6
July 1973	55.5
October 1973	52.9
December 1973	53.6
February 1974	52.3
April 1974	48.9
June 1974	49.3
August 1974	39.6
October 1974	44.3
December 1974	54.5
February 1975	55.3
April 1975	56.8
June 1975	56.8
August 1975	50.3
November 1975	37.4
January 1976	40.8
March 1976	44.0
May 1976	56.2
July 1976	52.4
September 1976	42.4
November 1976	39.4
January 1977	37.5
March 1977	44.4
May 1977	55.1
July 1977	43.0
September 1977	34.4
November 1977	37.2
February 1978	42.2
April 1978	45.6
June 1978	46.4
August 1978	36.7
October 1978	33.6
December 1978	38.2
February 1979	43.1
April 1979	56.3
June 1979	55.9
August 1979	54.7
October 1979	42.0
December 1979	40.8
February 1980	44.6
May 1980	55.1
July 1980	40.2
September 1980	29.8
November 1980	39.3
January 1981	42.8
March 1981	46.8
May 1981	50.4
July 1981	48.6
September 1981	40.9
November 1981	55.6
January 1982	48.1
March 1982	48.8
June 1982	56.1
August 1982	44.3
October 1982	36.8
December 1982	38.4
February 1983	41.4
April 1983	45.7
June 1983	53.2
August 1983	49.4
October 1983	42.0
December 1983	38.1
February 1984	38.2
April 1984	51.3
June 1984	46.8
September 1984	34.0
November 1984	42.0
January 1985	50.8
March 1985	52.6
May 1985	56.4
July 1985	47.6
September 1985	30.6
November 1985	35.1
January 1986	36.7
March 1986	42.5
May 1986	48.8
July 1986	41.4
October 1986	28.4
December 1986	34.7
February 1987	44.9
April 1987	46.8
June 1987	49.0
August 1987	35.3
October 1987	26.0
December 1987	29.3
February 1988	30.7
April 1988	33.6
June 1988	36.9
August 1988	27.4
October 1988	30.2
January 1989	33.1
March 1989	36.1
May 1989	51.6
July 1989	44.6
September 1989	31.7
November 1989	27.2
January 1990	26.1
March 1990	44.9
May 1990	52.0
July 1990	38.3
September 1990	29.8
November 1990	29.7
February 1991	35.9
April 1991	40.6
June 1991	47.8
August 1991	38.0
October 1991	36.0
December 1991	53.2
February 1992	50.5
April 1992	46.9
June 1992	49.6
August 1992	40.4
October 1992	34.0
December 1992	41.6
February 1993	45.3
May 1993	47.7
July 1993	43.4
September 1993	26.5
November 1993	45.7
January 1994	48.5
March 1994	48.8
May 1994	49.5
July 1994	41.5
September 1994	32.3
November 1994	37.9
January 1995	42.5
March 1995	48.0
May 1995	50.4
August 1995	38.1
October 1995	32.1
December 1995	28.0
February 1996	32.3
April 1996	41.0
June 1996	37.5
August 1996	35.5
October 1996	33.8
December 1996	41.0
February 1997	44.7
April 1997	48.4
June 1997	47.2
September 1997	28.7
November 1997	29.1
January 1998	47.5
March 1998	48.6
May 1998	42.5
July 1998	29.0
September 1998	22.6

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

-0.51 Mm³

Mean drawdown per month over 12 months

10 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

Lk Arlington At Arlington, TX

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	1957–1998
Completeness	98.8% 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 1957 and 1998 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-08049200.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), Lk Arlington At Arlington, TX reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-08049200/

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 Lk Arlington At Arlington, TX 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

498 monthly observations 1957–1998 Mm³

Spatially aggregatedHigh confidenceSeptember 1998

Source: USGS — National Water Information System, 08049200. 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.