HydrionisGlobal Water Intelligence
Monitored reservoir

Lake Overholser Near Oklahoma City, OK

United States Geological Survey reservoir gauge 07240500 in OK, with published storage from 1999.

Storage record07240500

Storage now, against this reservoir's own record

12.28 Mm³
Stored, September 2026
35th
Percentile among 27 Seps on record
-13.4%
Against the Sep 1991–2020 average
-34.4%
Change over the 12 months to 2026-09

Storage in September 2026 was around the middle of the Sep record, ranked against 27 other Seps held for this reservoir.

Storage, 1999–2026

Monthly mean storage
322 monthly values, 1999 to 2026
Monthly mean storageMonthly mean storage: Lake Overholser Near Oklahoma City, OK in Mm³, from 1999.75 to 2026.6666666666667.01020Mm³1999.752003.16666666666672006.583333333333320102013.416666666666720172020.41666666666672023.8333333333333Year

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 322 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 322 would be longer than this page and unusable with a screen reader.
PeriodLake Overholser Near Oklahoma City, OK (Mm³)
October 19999.84
November 19999.55
January 200017.1
February 200016.5
March 200017.3
May 200019.8
June 200018.5
July 200018.7
September 200010.0
October 20008.48
November 200010.0
January 200110.6
February 200111.6
March 20017.63
May 20017.94
June 200112.2
July 200110.3
September 200110.6
October 200111.0
December 200110.6
January 200210.4
February 200211.0
April 200210.9
May 200210.9
June 200211.7
August 20029.44
September 20028.25
October 20027.75
December 20029.06
January 20039.32
February 20038.94
April 20038.93
May 200313.7
June 200319.6
August 200314.2
September 200311.9
October 200310.2
December 20036.95
January 20046.33
February 20045.18
April 200410.5
May 200419.4
June 200418.1
August 200418.9
September 200416.8
October 200418.0
December 200419.2
January 200519.3
February 200519.1
April 200518.0
May 200517.5
June 200518.9
August 200517.6
September 200519.4
November 200517.2
December 200514.5
January 200615.9
March 200614.1
April 200612.5
May 200611.1
July 200610.00
August 200610.6
September 20068.82
November 20067.83
December 20067.67
January 20077.55
March 20077.52
April 200717.8
May 200719.5
July 200720.7
August 200719.9
September 200719.2
November 200717.0
December 200716.5
January 200816.1
March 200817.8
April 200819.6
May 200819.7
July 200818.4
August 200817.7
September 200819.2
November 200819.0
December 200819.1
January 200919.8
March 200919.5
April 200918.2
June 200920.0
July 200917.0
August 200914.1
October 200911.8
November 200919.7
December 200919.4
February 201020.5
March 201019.8
April 201018.9
June 201019.2
July 201020.3
August 201017.4
October 201012.8
November 201011.8
December 201013.5
February 201111.3
March 201110.9
April 201110.0
June 20119.37
July 20118.24
August 20114.97
October 20114.50
November 201114.9
December 201115.9
February 201214.7
March 201215.0
April 201215.9
June 201215.0
July 201212.3
August 20128.43
October 20128.03
November 20127.67
December 20127.33
February 20137.22
March 20137.35
May 201313.4
June 201320.6
July 201319.7
September 201318.8
October 201316.8
November 201315.5
January 201414.7
February 201414.5
March 201413.7
May 201411.6
June 201413.2
July 201413.4
September 20149.80
October 20148.70
November 20148.46
January 20158.27
February 20158.20
March 20158.12
May 201515.8
June 201519.6
July 201520.5
September 201516.8
December 201514.2
January 201618.0
March 201618.3
April 201618.7
May 201619.9
July 201618.5
August 201615.8
September 201613.0
November 201611.3
December 201612.3
January 201713.2
March 201713.9
April 201716.5
June 201720.0
July 201719.9
August 201719.8
October 201720.3
November 201718.7
December 201717.7
February 201817.8
March 201817.7
April 201817.1
June 201816.2
July 201815.6
August 201816.0
October 201820.0
November 201819.7
December 201819.3
February 201918.6
March 201918.3
April 201918.2
June 201918.9
July 201919.9
August 201920.1
October 201919.9
November 201920.0
December 201919.8
February 202020.0
March 202019.6
April 202018.9
June 202019.2
July 202018.5
August 202019.8
October 202019.8
November 202020.2
January 202120.0
February 202119.5
March 202119.3
May 202119.2
June 202120.2
July 202119.7
September 202118.0
October 202117.8
November 202117.4
January 202216.8
February 202216.6
March 202216.5
May 202218.4
June 202219.7
July 202217.7
September 202215.5
October 202214.7
November 202214.9
January 202314.5
February 202314.1
March 202313.2
May 202312.4
June 202313.0
July 202317.7
September 202317.2
October 202316.1
November 202316.0
January 202416.6
February 202418.3
March 202418.9
May 202419.4
June 202419.0
July 202417.9
September 202415.5
October 202414.3
December 202418.8
January 202519.1
February 202519.2
April 202519.3
May 202519.9
June 202520.0
August 202519.5
September 202518.7
October 202517.6
December 202517.1
January 202617.2
February 202617.6
April 202617.8
May 202617.3
June 202616.5
August 202613.9
September 202612.3

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 12.05101520Mm³123456789101112Month1991–2020 average 1: 14.1 Mm³1991–2020 average 2: 14.1 Mm³1991–2020 average 3: 13.9 Mm³1991–2020 average 4: 14.7 Mm³1991–2020 average 5: 16.2 Mm³1991–2020 average 6: 17.2 Mm³1991–2020 average 7: 16.7 Mm³1991–2020 average 8: 15.3 Mm³1991–2020 average 9: 14.2 Mm³1991–2020 average 10: 13.5 Mm³1991–2020 average 11: 14.1 Mm³1991–2020 average 12: 14.1 Mm³Most recent 12 months 1: 17.2 Mm³Most recent 12 months 2: 17.6 Mm³Most recent 12 months 3: 17.4 Mm³Most recent 12 months 4: 17.8 Mm³Most recent 12 months 5: 17.3 Mm³Most recent 12 months 6: 16.5 Mm³Most recent 12 months 7: 15.8 Mm³Most recent 12 months 8: 13.9 Mm³Most recent 12 months 9: 12.3 Mm³Most recent 12 months 10: 17.6 Mm³Most recent 12 months 11: 16.9 Mm³Most recent 12 months 12: 17.1 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)
Jan14.117.2
Feb14.117.6
Mar13.917.4
Apr14.717.8
May16.217.3
Jun17.216.5
Jul16.715.8
Aug15.313.9
Sep14.212.3
Oct13.517.6
Nov14.116.9
Dec14.117.1

Why this page shows a volume and not a percentage

Rate and persistence

-0.54 Mm³
Mean drawdown per month over 12 months
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

Lake Overholser Near Oklahoma City, OK
Gauge location
Lake Overholser Near Oklahoma City, OKLake Overholser Near Oklahoma City, OK — 12.28 Mm³Lake Overholser Near Oklahoma City, OK — 12.28 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 held1999–2026
Completeness95.8% 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.
Continuity96% of the months between 1999 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 Overholser Near Oklahoma City, OK reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-07240500/

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 Overholser Near Oklahoma City, 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

322 monthly observations 1999–2026 Mm³
Spatially aggregatedHigh confidenceSeptember 2026

Source: USGS — National Water Information System, 07240500. 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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