HydrionisGlobal Water Intelligence
Monitored reservoir

Lake Altus At Lugert, OK

United States Geological Survey reservoir gauge 07302500 in OK, with published storage from 1988.

Storage record07302500

Storage now, against this reservoir's own record

39.12 Mm³
Stored, September 2026
40th
Percentile among 36 Seps on record
-37.2%
Against the Sep 1991–2020 average
-4.4%
Change over the 12 months to 2026-09

Storage in September 2026 was around the middle of the Sep record, ranked against 36 other Seps held for this reservoir.

Storage, 1988–2026

Monthly mean storage
443 monthly values, 1988 to 2026
Monthly mean storageMonthly mean storage: Lake Altus At Lugert, OK in Mm³, from 1988.4166666666667 to 2026.6666666666667.050100150200Mm³1988.41666666666671994.51999.16666666666672003.83333333333332008.52013.16666666666672017.83333333333332022.5Year

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 443 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 443 would be longer than this page and unusable with a screen reader.
PeriodLake Altus At Lugert, OK (Mm³)
June 1988157
August 198898.2
October 1988108
December 1988118
January 1989124
March 1989141
May 1989164
March 199061.8
January 1991106
March 1991115
April 1991119
June 1991151
August 199193.5
October 199185.0
December 1991103
February 1992137
April 1992160
May 1992165
July 1992162
October 1992128
December 1992141
February 1993165
April 1993167
June 1993166
July 1993149
September 199399.4
November 199395.9
January 1994100
March 1994112
May 1994128
June 1994128
August 199452.0
October 199431.5
December 199435.6
February 199538.9
April 199547.1
June 1995158
July 1995162
September 1995148
November 1995167
January 1996168
March 1996167
May 1996147
July 1996130
August 1996113
October 1996158
December 1996167
February 1997170
April 1997177
June 1997168
July 1997159
September 1997143
November 1997167
January 1998167
March 1998171
May 1998166
July 1998108
August 199864.2
October 199843.2
December 199871.8
February 199993.9
April 1999126
June 1999169
August 1999117
September 199984.4
November 199979.5
January 200084.5
March 2000102
May 2000142
July 2000157
August 200098.4
October 200054.1
December 200069.1
February 200196.6
April 2001135
June 2001166
August 200174.3
September 200163.2
November 200160.5
January 200266.0
March 200277.1
May 200289.6
July 200285.9
August 200246.3
October 200220.4
December 200243.7
February 200361.9
April 200374.8
June 200388.2
August 200333.6
September 200323.4
November 200326.9
January 200431.3
March 200457.7
May 200477.5
July 200477.2
September 200431.8
October 200434.6
December 200462.6
February 200589.5
April 2005107
June 2005124
August 200572.4
September 200562.9
November 200563.2
January 200666.1
March 200671.6
May 200680.1
July 200656.7
September 200615.3
October 200615.9
December 200618.1
February 200735.9
April 200783.9
June 2007170
August 2007125
October 2007108
November 2007109
January 2008121
March 2008137
May 2008150
July 2008117
September 200863.7
October 200875.8
December 200894.1
February 2009107
April 2009119
June 2009138
August 200965.2
October 200937.8
November 200943.1
January 201052.6
March 201073.8
May 2010109
July 2010129
September 201058.0
November 201060.7
December 201064.9
February 201174.1
April 201180.5
June 201160.5
August 201131.4
October 201128.4
November 201129.6
January 201230.5
March 201233.4
May 201239.5
July 201234.9
September 201229.8
November 201227.4
December 201226.7
February 201326.5
April 201327.2
June 201326.0
August 201322.0
October 201320.1
December 201319.9
January 201419.7
March 201419.2
May 201417.7
July 201419.4
September 201417.3
November 201415.8
December 201415.6
February 201515.3
April 201519.3
June 2015162
August 2015121
October 201597.1
December 2015111
January 2016124
March 2016140
May 2016152
July 2016147
September 201685.9
November 201688.9
December 201689.9
February 2017104
April 2017122
June 2017139
August 201791.9
October 201795.5
December 2017103
January 2018106
March 2018114
May 2018119
July 201887.6
September 201836.0
November 201875.3
January 201988.2
February 201994.2
April 2019120
June 2019160
August 2019102
October 201970.7
December 201978.5
January 202085.1
March 2020102
May 2020115
July 202094.6
September 202029.8
November 202028.4
January 202130.2
February 202132.2
April 202143.3
June 202155.6
August 202146.1
October 202126.7
December 202126.0
February 202228.8
March 202230.9
May 202233.1
July 202237.8
September 202234.4
November 202232.6
January 202332.3
February 202333.0
April 202333.8
June 202343.9
August 202352.6
October 202347.9
December 202348.1
February 202458.0
March 202461.8
May 202468.1
July 202467.7
September 202462.4
November 202468.3
January 202582.9
March 202590.3
April 202594.0
June 2025121
August 202566.0
October 202539.1
December 202537.9
February 202640.5
March 202641.9
May 202642.1
July 202644.8
September 202639.1

The reservoir's year

Seasonal storage profile
Each calendar month's reference average, against the most recent year
Seasonal storage profileSeasonal storage profile: 1991–2020 average, Most recent 12 months in Mm³, from 1 to 12.050100Mm³123456789101112Month1991–2020 average 1: 84.1 Mm³1991–2020 average 2: 90.2 Mm³1991–2020 average 3: 96.8 Mm³1991–2020 average 4: 105 Mm³1991–2020 average 5: 116 Mm³1991–2020 average 6: 125 Mm³1991–2020 average 7: 111 Mm³1991–2020 average 8: 79.0 Mm³1991–2020 average 9: 62.3 Mm³1991–2020 average 10: 67.9 Mm³1991–2020 average 11: 72.0 Mm³1991–2020 average 12: 76.1 Mm³Most recent 12 months 1: 38.8 Mm³Most recent 12 months 2: 40.5 Mm³Most recent 12 months 3: 41.9 Mm³Most recent 12 months 4: 43.1 Mm³Most recent 12 months 5: 42.1 Mm³Most recent 12 months 6: 41.6 Mm³Most recent 12 months 7: 44.8 Mm³Most recent 12 months 8: 41.9 Mm³Most recent 12 months 9: 39.1 Mm³Most recent 12 months 10: 39.1 Mm³Most recent 12 months 11: 38.0 Mm³Most recent 12 months 12: 37.9 Mm³
  • 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
Period1991–2020 average (Mm³)Most recent 12 months (Mm³)
Jan84.138.8
Feb90.240.5
Mar96.841.9
Apr10543.1
May11642.1
Jun12541.6
Jul11144.8
Aug79.041.9
Sep62.339.1
Oct67.939.1
Nov72.038.0
Dec76.137.9

Why this page shows a volume and not a percentage

Rate and persistence

-0.15 Mm³
Mean drawdown per month over 12 months
6 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

Lake Altus At Lugert, OK
Gauge location
Lake Altus At Lugert, OKLake Altus At Lugert, OK — 39.12 Mm³Lake Altus At Lugert, OK — 39.12 Mm³

About this data

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 existMeasured
Period held1988–2026
Completeness94.7% 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.
Continuity95% of the months between 1988 and 2026 are held. Monthly means of the publisher's own daily record.
Last read from the publisher2026-10-01
RedistributionPermitted by the upstream licences
Commercial reusePermitted by the upstream licences. No Hydrionis access tier can widen this.
MethodologyHow this was produced

Use this data

Use this data

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), Lake Altus At Lugert, OK reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-07302500/

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 Lake Altus At Lugert, OK 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

443 monthly observations 1988–2026 Mm³
Spatially aggregatedHigh confidenceSeptember 2026

Source: USGS — National Water Information System, 07302500. 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.

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