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

14.09 Mm³
Stored, August 2026
23rd
Percentile among 27 Augs on record
-7.9%
Against the Aug 1991–2020 average
-27.6%
Change over the 12 months to 2026-08

Storage in August 2026 was lower than most Augs on record, ranked against 27 other Augs held for this reservoir.

Storage, 1999–2026

Monthly mean storage
321 monthly values, 1999 to 2026
Monthly mean storageMonthly mean storage: Lake Overholser Near Oklahoma City, OK in Mm³, from 1999.75 to 2026.5833333333333.01020Mm³1999.752003.16666666666672006.583333333333320102013.416666666666720172020.41666666666672023.8333333333333Year

Monthly means of the publisher's daily record. Volume, not percentage of capacity: without a capacity whose definition is stated, fullness cannot be computed.

View the data behind this chart
Underlying data
PeriodLake Overholser Near Oklahoma City, OK (Mm³)
October 19999.84
November 19999.55
December 199913.0
January 200017.1
February 200016.5
March 200017.3
April 200019.9
May 200019.8
June 200018.5
July 200018.7
August 200014.5
September 200010.0
October 20008.48
November 200010.0
December 200010.3
January 200110.6
February 200111.6
March 20017.63
April 20015.33
May 20017.94
June 200112.2
July 200110.3
August 20019.29
September 200110.6
October 200111.0
November 200110.7
December 200110.6
January 200210.4
February 200211.0
March 200210.8
April 200210.9
May 200210.9
June 200211.7
July 200211.9
August 20029.44
September 20028.25
October 20027.75
November 20026.89
December 20029.06
January 20039.32
February 20038.94
March 20039.09
April 20038.93
May 200313.7
June 200319.6
July 200317.9
August 200314.2
September 200311.9
October 200310.2
November 20039.27
December 20036.95
January 20046.33
February 20045.18
March 20047.34
April 200410.5
May 200419.4
June 200418.1
July 200420.0
August 200418.9
September 200416.8
October 200418.0
November 200419.9
December 200419.2
January 200519.3
February 200519.1
March 200518.8
April 200518.0
May 200517.5
June 200518.9
July 200519.4
August 200517.6
September 200519.4
October 200519.9
November 200517.2
December 200514.5
January 200615.9
February 200615.7
March 200614.1
April 200612.5
May 200611.1
June 200610.8
July 200610.00
August 200610.6
September 20068.82
October 20068.17
November 20067.83
December 20067.67
January 20077.55
February 20077.79
March 20077.52
April 200717.8
May 200719.5
June 200720.7
July 200720.7
August 200719.9
September 200719.2
October 200717.6
November 200717.0
December 200716.5
January 200816.1
February 200815.9
March 200817.8
April 200819.6
May 200819.7
June 200820.5
July 200818.4
August 200817.7
September 200819.2
October 200819.3
November 200819.0
December 200819.1
January 200919.8
February 200920.4
March 200919.5
April 200918.2
May 200919.7
June 200920.0
July 200917.0
August 200914.1
September 200912.1
October 200911.8
November 200919.7
December 200919.4
January 201019.8
February 201020.5
March 201019.8
April 201018.9
May 201019.8
June 201019.2
July 201020.3
August 201017.4
September 201015.1
October 201012.8
November 201011.8
December 201013.5
January 201111.9
February 201111.3
March 201110.9
April 201110.0
May 20119.35
June 20119.37
July 20118.24
August 20114.97
September 20113.24
October 20114.50
November 201114.9
December 201115.9
January 201214.6
February 201214.7
March 201215.0
April 201215.9
May 201215.8
June 201215.0
July 201212.3
August 20128.43
September 20127.18
October 20128.03
November 20127.67
December 20127.33
January 20137.20
February 20137.22
March 20137.35
April 201311.2
May 201313.4
June 201320.6
July 201319.7
August 201321.0
September 201318.8
October 201316.8
November 201315.5
December 201314.9
January 201414.7
February 201414.5
March 201413.7
April 201412.3
May 201411.6
June 201413.2
July 201413.4
August 201411.9
September 20149.80
October 20148.70
November 20148.46
December 20148.33
January 20158.27
February 20158.20
March 20158.12
April 20158.58
May 201515.8
June 201519.6
July 201520.5
August 201519.6
September 201516.8
December 201514.2
January 201618.0
February 201618.6
March 201618.3
April 201618.7
May 201619.9
June 201619.7
July 201618.5
August 201615.8
September 201613.0
October 201611.3
November 201611.3
December 201612.3
January 201713.2
February 201713.6
March 201713.9
April 201716.5
May 201718.9
June 201720.0
July 201719.9
August 201719.8
September 201719.9
October 201720.3
November 201718.7
December 201717.7
January 201817.9
February 201817.8
March 201817.7
April 201817.1
May 201817.1
June 201816.2
July 201815.6
August 201816.0
September 201817.2
October 201820.0
November 201819.7
December 201819.3
January 201919.5
February 201918.6
March 201918.3
April 201918.2
May 201919.0
June 201918.9
July 201919.9
August 201920.1
September 201920.1
October 201919.9
November 201920.0
December 201919.8
January 202019.6
February 202020.0
March 202019.6
April 202018.9
May 202019.3
June 202019.2
July 202018.5
August 202019.8
September 202020.4
October 202019.8
November 202020.2
December 202020.2
January 202120.0
February 202119.5
March 202119.3
April 202119.2
May 202119.2
June 202120.2
July 202119.7
August 202118.8
September 202118.0
October 202117.8
November 202117.4
December 202116.8
January 202216.8
February 202216.6
March 202216.5
April 202216.9
May 202218.4
June 202219.7
July 202217.7
August 202216.0
September 202215.5
October 202214.7
November 202214.9
December 202214.8
January 202314.5
February 202314.1
March 202313.2
April 202312.3
May 202312.4
June 202313.0
July 202317.7
August 202318.7
September 202317.2
October 202316.1
November 202316.0
December 202316.2
January 202416.6
February 202418.3
March 202418.9
April 202419.4
May 202419.4
June 202419.0
July 202417.9
August 202416.8
September 202415.5
October 202414.3
November 202418.0
December 202418.8
January 202519.1
February 202519.2
March 202519.0
April 202519.3
May 202519.9
June 202520.0
July 202520.0
August 202519.5
September 202518.7
October 202517.6
November 202516.9
December 202517.1
January 202617.2
February 202617.6
March 202617.4
April 202617.8
May 202617.3
June 202616.5
July 202615.8
August 202614.1

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 12.05101520Mm³123456789101112Month1991–2020 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: 14.1 Mm³Most recent 12 months 9: 18.7 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
Aug15.314.1
Sep14.218.7
Oct13.517.6
Nov14.116.9
Dec14.117.1

Rate and persistence

-0.45 Mm³
Mean drawdown per month over 12 months
0 of 24
Months in the last two years 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 — 14.09 Mm³Lake Overholser Near Oklahoma City, OK — 14.09 Mm³

Where this comes from

321 monthly observations 1999–2026 Mm³
Spatially aggregatedHigh confidenceAugust 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 25 August 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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