HydrionisGlobal Water Intelligence
Monitored reservoir

Utah Lake

Utah Lake is a federal reservoir operated by the United States Bureau of Reclamation in its Upper Colorado region, with published operating records from 1932.

Storage recordUtah Lake

Storage now, against this reservoir's own record

1,031.84 Mm³
Stored, May 2020
65th
Percentile among 89 Mays on record
+12.3%
Against the May 1991–2020 average
+18.5%
Change over the 12 months to 2020-05

Storage in May 2020 was around the middle of the May record, ranked against 89 other Mays held for this reservoir.

Storage, 1932–2020

Monthly mean storage
1,061 monthly values, 1932 to 2020
Monthly mean storageMonthly mean storage: Utah Lake in Mm³, from 1932 to 2020.3333333333333.05001,0001,5002,000Mm³19321943.08333333333331954.16666666666671965.251976.33333333333331987.41666666666671998.52009.5833333333333Year

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 1,061 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 1,061 would be longer than this page and unusable with a screen reader.
PeriodUtah Lake (Mm³)
January 1932360
May 1932549
October 1932272
February 1933422
July 1933391
November 1933208
April 1934355
August 1934120
December 193464.3
May 1935201
September 193521.9
February 1936148
June 1936316
November 1936162
March 1937408
August 1937365
December 1937351
April 1938586
September 1938366
January 1939484
June 1939546
October 1939278
March 1940508
July 1940313
November 1940156
April 1941439
August 1941295
January 1942395
May 1942639
October 1942300
February 1943476
June 1943569
November 1943318
March 1944561
August 1944587
December 1944529
May 1945847
September 1945643
February 1946827
June 1946867
October 1946556
March 1947957
July 1947918
December 1947840
April 19481,034
September 1948659
January 1949773
May 1949968
October 1949680
February 1950924
July 1950917
November 1950715
April 19511,002
August 1951842
December 1951840
May 19521,438
September 19521,228
February 19531,259
June 19531,158
November 1953853
March 19541,036
August 1954716
December 1954650
April 1955874
September 1955527
January 1956640
June 1956731
October 1956393
March 1957647
July 1957774
November 1957608
April 1958942
August 1958711
January 1959718
May 1959841
October 1959476
February 1960647
July 1960440
November 1960278
March 1961449
August 1961204
December 1961239
May 1962555
September 1962293
February 1963398
June 1963468
October 1963250
March 1964457
July 1964620
December 1964476
April 1965723
September 1965659
January 1966852
May 1966951
October 1966563
February 1967783
July 1967889
November 1967714
April 19681,027
August 1968898
January 1969967
May 19691,134
September 1969919
February 19701,076
June 19701,039
November 1970869
March 19711,059
August 1971871
December 1971941
April 19721,065
September 1972717
January 1973901
June 19731,148
October 1973916
March 19741,115
July 19741,003
November 1974803
April 19751,051
August 19751,115
January 19761,120
May 19761,158
October 1976789
February 1977927
July 1977819
November 1977654
March 1978884
August 1978817
December 1978870
May 19791,098
September 1979768
February 1980960
June 19801,214
October 1980994
March 19811,103
July 1981994
December 1981908
April 19821,121
September 19821,103
January 19831,298
May 19831,482
October 19831,438
February 19841,507
July 19841,643
November 19841,411
April 19851,481
August 19851,279
January 19861,227
May 19861,575
September 19861,167
February 19871,097
June 1987978
November 1987799
March 19881,002
August 1988725
December 1988653
April 1989862
September 1989488
January 1990632
June 1990661
October 1990387
March 1991577
July 1991527
November 1991405
April 1992615
August 1992286
January 1993421
May 1993741
October 1993709
February 1994876
July 1994762
November 1994650
March 1995845
August 19951,020
December 19951,030
May 19961,134
September 1996887
February 19971,128
June 19971,208
October 19971,047
March 19981,137
July 19981,192
December 19981,111
April 19991,113
September 1999963
January 20001,041
June 2000999
October 2000762
February 2001919
July 2001787
November 2001603
April 2002827
August 2002551
January 2003586
May 2003632
September 2003404
February 2004554
June 2004553
November 2004400
March 2005614
August 2005864
December 2005900
April 20061,104
September 2006924
January 20071,049
June 20071,010
October 2007779
March 2008993
July 2008974
December 2008865
April 20091,056
August 20091,018
January 20101,041
May 20101,066
October 2010823
February 20111,057
July 20111,323
November 20111,062
March 20121,084
August 2012815
December 2012803
May 2013933
September 2013670
February 2014791
June 2014746
October 2014565
March 2015699
July 2015593
December 2015490
April 2016594
September 2016344
January 2017447
June 2017778
October 2017620
February 2018732
July 2018657
November 2018524
April 2019749
August 2019936
January 2020991
May 20201,032

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 12.05001,000Mm³123456789101112Month1991–2020 average 1: 800 Mm³1991–2020 average 2: 843 Mm³1991–2020 average 3: 879 Mm³1991–2020 average 4: 900 Mm³1991–2020 average 5: 919 Mm³1991–2020 average 6: 907 Mm³1991–2020 average 7: 844 Mm³1991–2020 average 8: 765 Mm³1991–2020 average 9: 711 Mm³1991–2020 average 10: 702 Mm³1991–2020 average 11: 727 Mm³1991–2020 average 12: 766 Mm³Most recent 12 months 1: 991 Mm³Most recent 12 months 2: 1,021 Mm³Most recent 12 months 3: 1,042 Mm³Most recent 12 months 4: 1,059 Mm³Most recent 12 months 5: 1,032 Mm³Most recent 12 months 6: 981 Mm³Most recent 12 months 7: 996 Mm³Most recent 12 months 8: 936 Mm³Most recent 12 months 9: 882 Mm³Most recent 12 months 10: 861 Mm³Most recent 12 months 11: 897 Mm³Most recent 12 months 12: 944 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)
Jan800991
Feb8431,021
Mar8791,042
Apr9001,059
May9191,032
Jun907981
Jul844996
Aug765936
Sep711882
Oct702861
Nov727897
Dec766944

Why this page shows a volume and not a percentage

Rate and persistence

+13.42 Mm³
Mean change 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

Utah Lake
Gauge location
Utah LakeUtah Lake — 1,031.84 Mm³Utah Lake — 1,031.84 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 Bureau of Reclamation — Reservoir operations and Colorado River data · US Government work — public domain
How the values came to existMeasured
Period held1932–2020
Completeness99.3% 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.
Continuity99% of the months between 1932 and 2020 are held. Monthly means of the publisher's own daily record.
Last read from the publisher2026-09-01
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), Utah Lake reservoir records, accessed 2026-09-02, hydrionis.com/reservoirs/reservoir-usbr-3206/

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 Utah Lake 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

1,061 monthly observations 1932–2020 Mm³
Spatially aggregatedHigh confidenceMay 2020

Source: USBR — Reservoir operations and Colorado River data, RISE catalogue item 4515. Licence: Open.

Method: Monthly mean of the daily values published by the Bureau of Reclamation in acre-feet, converted to Mm³. Months with fewer than 20 days of record are not published rather than averaged from a partial month.

Stored as a volume and not as a share of capacity: the operator publishes what is in the reservoir but not what it holds when full, so a percentage cannot be computed without inventing the denominator.

Retrieved 1 September 2026.

Monthly mean of the daily values published by the Bureau of Reclamation in acre-feet, converted to Mm³. Months with fewer than 20 days of record are not published rather than averaged from a partial month.

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