HydrionisGlobal Water Intelligence
Monitored reservoir

Lake Eucha Near Eucha, OK

United States Geological Survey reservoir gauge 07191285 in OK, with published storage from 2001.

Storage record07191285

Storage now, against this reservoir's own record

74.66 Mm³
Stored, September 2026
13th
Percentile among 25 Seps on record
-9.5%
Change over the 12 months to 2026-09

Storage in September 2026 was lower than most Seps on record, ranked against 25 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, 2001–2026

Monthly mean storage
300 monthly values, 2001 to 2026
Monthly mean storageMonthly mean storage: Lake Eucha Near Eucha, OK in Mm³, from 2001.75 to 2026.6666666666667.0255075100Mm³2001.752004.91666666666672008.08333333333332011.252014.41666666666672017.58333333333332020.752023.9166666666667Year

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 300 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 300 would be longer than this page and unusable with a screen reader.
PeriodLake Eucha Near Eucha, OK (Mm³)
October 200170.3
November 200171.5
January 200288.2
February 200293.3
March 200294.1
April 200294.5
June 200294.3
July 200291.3
August 200285.7
September 200279.2
November 200269.7
December 200269.0
January 200369.9
February 200370.2
April 200385.1
May 200390.7
June 200394.0
July 200391.7
September 200379.5
October 200374.9
November 200371.4
December 200373.2
February 200491.1
March 200494.8
April 200494.7
May 200494.6
July 200494.6
August 200493.8
September 200491.6
October 200486.7
December 200494.2
January 200594.7
February 200593.7
March 200594.3
May 200593.9
June 200593.9
July 200591.0
August 200584.8
October 200573.8
November 200568.1
December 200563.5
January 200662.7
March 200661.2
April 200659.8
May 200669.9
June 200672.5
August 200660.4
September 200660.1
October 200661.5
November 200662.8
January 200790.8
February 200793.8
March 200793.7
April 200793.8
June 200794.0
July 200793.7
August 200789.1
September 200782.9
November 200793.2
December 200793.3
January 200894.4
February 200894.9
April 200895.8
May 200894.6
June 200895.1
July 200894.3
September 200893.6
October 200893.8
November 200893.8
December 200893.9
February 200993.6
March 200993.8
April 200994.4
May 200994.8
July 200991.6
August 200989.3
September 200992.6
October 200994.9
December 200993.9
January 201094.0
February 201094.3
March 201094.6
May 201094.2
June 201093.5
July 201092.3
August 201086.8
October 201077.4
November 201073.5
December 201074.0
January 201172.7
March 201185.1
April 201189.8
May 201194.8
June 201193.8
August 201181.0
September 201173.0
October 201168.2
November 201170.9
January 201289.5
February 201293.8
March 201294.2
April 201293.8
June 201289.7
July 201281.0
August 201269.0
September 201262.3
November 201257.3
December 201255.7
January 201359.6
February 201370.1
April 201394.7
May 201394.7
June 201394.0
July 201390.3
September 201392.4
October 201388.5
November 201389.9
December 201392.0
February 201493.7
March 201494.0
April 201493.3
May 201493.8
July 201493.4
August 201491.8
September 201486.0
October 201490.5
December 201494.0
January 201594.0
February 201593.9
March 201594.7
May 201594.9
June 201594.8
July 201594.9
August 201593.9
October 201592.3
November 201593.0
December 201595.9
January 201694.5
March 201694.1
April 201694.0
May 201694.2
June 201693.6
August 201691.7
September 201688.8
October 201687.3
November 201686.2
January 201781.5
February 201783.7
March 201784.7
April 201789.9
June 201794.0
July 201793.3
August 201792.1
September 201787.7
November 201783.0
December 201781.8
January 201884.5
February 201889.7
April 201894.2
May 201894.3
June 201893.0
July 201888.6
September 201881.8
October 201878.6
November 201878.4
December 201879.4
February 201994.1
March 201994.1
April 201994.4
May 201995.5
July 201993.6
August 201993.7
September 201993.4
October 201994.1
December 201994.3
January 202094.8
February 202083.2
March 202080.0
May 202095.3
June 202094.3
July 202093.8
August 202093.6
October 202091.0
November 202093.8
December 202094.0
January 202194.5
March 202193.7
April 202194.6
May 202194.6
June 202194.3
August 202193.8
September 202191.8
October 202188.7
November 202193.0
January 202294.1
February 202293.9
March 202294.4
April 202294.7
June 202293.5
July 202291.6
August 202293.0
September 202289.6
November 202280.6
December 202290.4
January 202390.0
February 202394.6
April 202394.1
May 202394.0
June 202393.6
July 202392.9
September 202390.5
October 202393.3
November 202393.6
December 202394.0
February 202494.1
March 202493.8
April 202493.5
May 202494.8
July 202487.6
August 202482.0
September 202476.3
October 202469.3
December 202467.0
January 202565.8
February 202564.6
March 202566.1
May 202580.8
June 202582.1
July 202581.2
August 202580.8
October 202582.4
November 202581.7
December 202581.9
January 202682.3
March 202683.7
April 202684.9
May 202683.5
June 202683.5
August 202680.4
September 202674.7

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 12.0255075100Mm³123456789101112Month1991–2020 average 10: 81.6 Mm³1991–2020 average 11: 81.7 Mm³1991–2020 average 12: 83.0 Mm³Most recent 12 months 1: 82.3 Mm³Most recent 12 months 2: 83.9 Mm³Most recent 12 months 3: 83.7 Mm³Most recent 12 months 4: 84.9 Mm³Most recent 12 months 5: 83.5 Mm³Most recent 12 months 6: 83.5 Mm³Most recent 12 months 7: 83.2 Mm³Most recent 12 months 8: 80.4 Mm³Most recent 12 months 9: 74.7 Mm³Most recent 12 months 10: 82.4 Mm³Most recent 12 months 11: 81.7 Mm³Most recent 12 months 12: 81.9 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)
Jan—82.3
Feb—83.9
Mar—83.7
Apr—84.9
May—83.5
Jun—83.5
Jul—83.2
Aug—80.4
Sep—74.7
Oct81.682.4
Nov81.781.7
Dec83.081.9

Why this page shows a volume and not a percentage

Rate and persistence

-0.65 Mm³
Mean drawdown per month over 12 months
18 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 Eucha Near Eucha, OK
Gauge location
Lake Eucha Near Eucha, OKLake Eucha Near Eucha, OK — 74.66 Mm³Lake Eucha Near Eucha, OK — 74.66 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 held2001–2026
Completeness96.2% 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 2001 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 Eucha Near Eucha, OK reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-07191285/

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 Eucha Near Eucha, 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

300 monthly observations 2001–2026 Mm³
Spatially aggregatedHigh confidenceSeptember 2026

Source: USGS — National Water Information System, 07191285. 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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