Hugh Butler Lake, Nebr. — storage

Storage now, against this reservoir's own record

38.18 Mm³

Stored, September 1994

86th

Percentile among 29 Seps on record

-9.7%

Change over the 12 months to 1994-09

Storage in September 1994 was higher than most Seps on record, ranked against 29 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, 1965–1994

Monthly mean storage

348 monthly values, 1965 to 1994

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 348 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 348 would be longer than this page and unusable with a screen reader.
Period	Hugh Butler Lake Near Mc Cook, Nebr. (Mm³)
October 1965	36.9
November 1965	38.2
January 1966	40.7
February 1966	42.1
April 1966	45.5
May 1966	45.4
July 1966	41.6
August 1966	41.1
October 1966	40.1
November 1966	40.9
January 1967	43.2
February 1967	44.7
March 1967	45.6
May 1967	46.5
June 1967	47.6
August 1967	46.1
September 1967	44.1
November 1967	45.8
December 1967	46.7
February 1968	47.5
March 1968	47.6
April 1968	47.8
June 1968	46.8
July 1968	42.8
September 1968	37.3
October 1968	37.0
December 1968	39.0
January 1969	40.4
March 1969	44.7
April 1969	46.5
June 1969	47.0
July 1969	47.3
August 1969	44.0
October 1969	41.5
November 1969	43.4
January 1970	45.9
February 1970	46.7
April 1970	46.9
May 1970	46.3
July 1970	42.3
August 1970	37.8
October 1970	36.0
November 1970	37.3
December 1970	38.6
February 1971	41.5
March 1971	43.7
May 1971	47.2
June 1971	46.7
August 1971	36.5
September 1971	33.9
November 1971	36.4
December 1971	38.1
January 1972	39.5
March 1972	42.1
April 1972	43.1
June 1972	46.5
July 1972	45.1
September 1972	35.8
October 1972	35.5
December 1972	39.0
January 1973	40.8
March 1973	45.1
April 1973	47.0
May 1973	47.3
July 1973	40.5
August 1973	37.5
October 1973	37.0
November 1973	38.5
January 1974	42.2
February 1974	44.4
April 1974	47.3
May 1974	47.8
July 1974	41.5
August 1974	35.6
September 1974	33.1
November 1974	34.8
December 1974	36.0
February 1975	38.9
March 1975	40.8
May 1975	43.8
June 1975	45.9
August 1975	38.7
September 1975	34.2
November 1975	35.3
December 1975	37.1
January 1976	38.9
March 1976	42.3
April 1976	43.6
June 1976	44.1
July 1976	39.3
September 1976	28.7
October 1976	29.8
December 1976	32.0
January 1977	33.1
February 1977	34.3
April 1977	40.4
May 1977	42.8
July 1977	37.6
August 1977	33.0
October 1977	33.0
November 1977	33.8
January 1978	36.1
February 1978	37.3
April 1978	44.4
May 1978	45.5
June 1978	45.3
August 1978	28.2
September 1978	21.2
November 1978	22.7
December 1978	24.3
February 1979	27.3
March 1979	30.2
May 1979	34.6
June 1979	34.0
August 1979	31.2
September 1979	28.3
October 1979	28.1
December 1979	30.4
January 1980	31.7
March 1980	36.1
April 1980	38.5
June 1980	39.7
July 1980	35.5
September 1980	24.6
October 1980	24.8
November 1980	25.6
January 1981	27.7
February 1981	28.8
April 1981	32.5
May 1981	34.7
July 1981	33.2
August 1981	33.5
October 1981	31.5
November 1981	32.3
January 1982	34.4
February 1982	35.4
March 1982	36.7
May 1982	39.1
June 1982	41.5
August 1982	35.2
September 1982	32.9
November 1982	34.0
December 1982	34.9
February 1983	37.9
March 1983	40.6
May 1983	44.9
June 1983	45.7
July 1983	42.9
September 1983	32.7
October 1983	32.2
December 1983	34.1
January 1984	35.2
March 1984	38.8
April 1984	41.0
June 1984	45.2
July 1984	43.5
August 1984	37.9
October 1984	34.7
November 1984	35.7
January 1985	37.9
February 1985	39.4
April 1985	42.4
May 1985	43.9
July 1985	39.8
August 1985	35.5
October 1985	32.7
November 1985	33.7
December 1985	34.7
February 1986	37.3
March 1986	38.7
May 1986	40.1
June 1986	41.0
August 1986	31.5
September 1986	29.5
November 1986	31.6
December 1986	32.5
February 1987	34.6
March 1987	36.4
April 1987	38.4
June 1987	39.6
July 1987	36.1
September 1987	29.0
October 1987	29.2
December 1987	31.6
January 1988	32.6
March 1988	36.8
April 1988	37.8
June 1988	38.3
July 1988	34.3
August 1988	32.3
October 1988	32.1
November 1988	32.6
January 1989	34.5
February 1989	35.4
April 1989	37.8
May 1989	38.3
July 1989	35.7
August 1989	31.1
September 1989	30.7
November 1989	31.4
December 1989	32.2
February 1990	34.5
March 1990	36.0
May 1990	38.0
June 1990	38.2
August 1990	27.5
September 1990	24.7
November 1990	25.8
December 1990	26.8
January 1991	27.6
March 1991	29.8
April 1991	31.1
June 1991	34.8
July 1991	30.9
September 1991	23.6
October 1991	23.6
December 1991	25.8
January 1992	27.3
March 1992	30.4
April 1992	31.3
May 1992	31.5
July 1992	31.2
August 1992	30.5
October 1992	30.1
November 1992	30.8
January 1993	32.5
February 1993	34.2
April 1993	39.6
May 1993	40.6
June 1993	41.3
August 1993	43.2
September 1993	42.3
November 1993	44.6
December 1993	45.4
February 1994	47.4
March 1994	48.0
May 1994	48.2
June 1994	46.6
August 1994	39.8
September 1994	38.2

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

-0.34 Mm³

Mean drawdown per month over 12 months

2 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

Hugh Butler Lake Near Mc Cook, Nebr.

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	1965–1994
Completeness	96.7% 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	97% of the months between 1965 and 1994 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-06837390.json
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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), Hugh Butler Lake Near Mc Cook, Nebr. reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-06837390/

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 Hugh Butler Lake Near Mc Cook, Nebr. 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

348 monthly observations 1965–1994 Mm³

Spatially aggregatedHigh confidenceSeptember 1994

Source: USGS — National Water Information System, 06837390. 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.