Crescent Lake And Crescent Lake — storage

Storage now, against this reservoir's own record

15.20 Mm³

Stored, August 2026

9th

Percentile among 44 Augs on record

-75.9%

Against the Aug 1991–2020 average

-46.8%

Change over the 12 months to 2026-08

Storage in August 2026 was lower than almost every other Aug on record, ranked against 44 other Augs held for this reservoir.

Storage, 1928–2026

Monthly mean storage

525 monthly values, 1928 to 2026

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 525 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 525 would be longer than this page and unusable with a screen reader.
Period	Crescent Lake And Crescent Lake (Mm³)
June 1928	85.1
February 1983	72.4
April 1983	83.5
July 1983	98.5
September 1983	89.3
November 1983	91.9
January 1984	96.9
March 1984	95.4
June 1984	97.9
August 1984	89.5
October 1984	92.0
December 1984	100
February 1985	95.9
May 1985	99.5
July 1985	89.7
September 1985	72.6
November 1985	78.1
January 1986	85.4
March 1986	96.5
June 1986	96.9
August 1986	75.8
October 1986	69.7
December 1986	77.3
February 1987	83.6
May 1987	90.9
July 1987	81.7
September 1987	58.5
November 1987	56.5
January 1988	62.0
April 1988	66.0
June 1988	67.1
August 1988	52.0
October 1988	32.7
December 1988	38.6
March 1989	43.8
May 1989	54.3
July 1989	58.8
September 1989	42.5
November 1989	43.2
February 1990	49.1
April 1990	51.9
June 1990	61.5
August 1990	46.4
October 1990	23.8
December 1990	27.6
March 1991	33.3
May 1991	36.4
July 1991	37.5
September 1991	14.4
November 1991	11.4
February 1992	16.8
April 1992	19.7
June 1992	20.4
August 1992	8.26
October 1992	7.61
January 1993	7.66
March 1993	8.47
May 1993	22.2
July 1993	36.5
September 1993	19.1
December 1993	20.6
February 1994	23.2
April 1994	24.5
June 1994	25.1
August 1994	6.10
November 1994	2.85
January 1995	3.57
March 1995	8.93
May 1995	15.4
July 1995	22.4
September 1995	6.59
December 1995	20.5
February 1996	37.6
April 1996	46.4
June 1996	65.4
August 1996	56.8
November 1996	57.5
January 1997	88.4
March 1997	87.7
May 1997	100
July 1997	105
October 1997	87.2
December 1997	93.1
February 1998	99.8
April 1998	100
June 1998	99.7
September 1998	79.0
November 1998	76.5
January 1999	88.6
March 1999	91.7
May 1999	85.0
August 1999	103
October 1999	93.5
December 1999	96.7
February 2000	100
April 2000	97.9
June 2000	106
September 2000	81.5
November 2000	81.9
January 2001	86.8
March 2001	88.6
May 2001	89.4
August 2001	64.4
October 2001	54.5
December 2001	58.1
February 2002	60.2
April 2002	61.3
July 2002	69.4
September 2002	49.4
November 2002	47.6
January 2003	51.4
March 2003	55.7
June 2003	61.2
August 2003	47.1
October 2003	35.2
December 2003	38.3
February 2004	41.8
May 2004	47.3
July 2004	53.7
September 2004	35.9
November 2004	34.7
January 2005	37.9
March 2005	37.2
June 2005	44.1
August 2005	25.7
October 2005	13.3
December 2005	17.7
February 2006	28.1
May 2006	33.7
July 2006	48.9
September 2006	37.2
November 2006	39.9
January 2007	50.5
April 2007	58.7
June 2007	67.4
August 2007	52.5
October 2007	44.2
December 2007	51.8
March 2008	60.2
May 2008	64.2
July 2008	79.6
September 2008	66.7
November 2008	70.5
February 2009	78.2
April 2009	81.0
June 2009	95.6
August 2009	88.4
October 2009	75.9
December 2009	79.0
March 2010	82.5
May 2010	84.6
July 2010	91.7
September 2010	73.2
November 2010	74.5
February 2011	86.3
April 2011	91.3
June 2011	101
August 2011	105
October 2011	97.4
January 2012	103
March 2012	99.9
May 2012	103
July 2012	96.6
September 2012	87.0
December 2012	96.3
February 2013	87.8
April 2013	90.3
June 2013	95.3
August 2013	79.6
November 2013	72.3
January 2014	74.4
March 2014	87.8
May 2014	93.7
July 2014	90.7
September 2014	76.1
December 2014	78.7
February 2015	91.0
April 2015	92.9
June 2015	91.5
August 2015	73.4
November 2015	60.3
January 2016	64.6
March 2016	66.0
May 2016	72.4
July 2016	74.1
October 2016	59.6
December 2016	63.5
February 2017	68.8
April 2017	76.8
June 2017	91.9
September 2017	87.7
November 2017	91.4
January 2018	95.2
March 2018	96.5
May 2018	99.5
August 2018	84.7
October 2018	73.8
December 2018	72.7
February 2019	72.7
April 2019	74.5
June 2019	81.5
September 2019	60.8
November 2019	54.7
January 2020	55.0
March 2020	54.0
May 2020	56.8
August 2020	41.6
October 2020	28.6
December 2020	27.6
February 2021	28.8
April 2021	27.5
July 2021	24.8
September 2021	8.76
November 2021	8.99
January 2022	10.8
March 2022	9.01
June 2022	20.2
August 2022	15.5
October 2022	8.20
December 2022	8.58
February 2023	9.51
May 2023	15.0
July 2023	18.5
September 2023	7.81
November 2023	7.62
January 2024	12.8
March 2024	17.2
June 2024	26.3
August 2024	16.6
October 2024	11.5
December 2024	15.0
February 2025	20.7
May 2025	31.3
July 2025	35.6
September 2025	22.5
November 2025	23.8
January 2026	29.3
April 2026	34.2
June 2026	27.7
August 2026	15.2

The reservoir's year

Seasonal storage profile

Each calendar month's reference average, against the most recent year

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
Period	1991–2020 average (Mm³)	Most recent 12 months (Mm³)
Jan	61.3	29.3
Feb	63.1	30.0
Mar	64.0	31.8
Apr	65.6	34.2
May	69.1	33.2
Jun	72.9	27.7
Jul	71.0	22.1
Aug	63.1	15.2
Sep	55.4	22.5
Oct	53.3	22.1
Nov	54.9	23.8
Dec	58.3	26.2

Why this page shows a volume and not a percentage

Percentage full is a division, and the denominator is missing

“Percentage full” is the figure a drought is discussed in, and it is stored volume divided by capacity. Capacity is published on several different bases — gross, usable, live, and the figure at a particular spillway or licence condition — and dividing a stored volume by the wrong one produces a percentage confidently wrong by the ratio between them, at exactly the moment the number matters most.

Hydrionis holds storage measurements for this reservoir and does not hold a compatible authoritative capacity figure for it, so percentage full is not calculated. The volume above is what was actually measured. Where you need a percentage, take the publisher’s own capacity on its own stated basis and divide it yourself — the source is linked below, and knowing which basis you used is the whole point.

Water level

Monthly mean water surface elevation

524 monthly values

An elevation above a datum, not a depth of water and not a distance below the crest. Levels at different reservoirs are measured against different datums and must not be read against one another; this line is comparable only with its own history. Elevation and volume are not proportional either — a metre near the bottom of a reservoir holds far less water than a metre near the top, because the surface area grows with height.

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 524 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 524 would be longer than this page and unusable with a screen reader.
Period	Crescent Lake And Crescent Lake (m)
1983	1,475
1983.1666666666667	1,476
1983.3333333333333	1,476
1983.5833333333333	1,477
1983.75	1,476
1983.9166666666667	1,477
1984.0833333333333	1,477
1984.25	1,477
1984.5	1,477
1984.6666666666667	1,476
1984.8333333333333	1,477
1985	1,477
1985.1666666666667	1,477
1985.3333333333333	1,477
1985.5833333333333	1,476
1985.75	1,475
1985.9166666666667	1,476
1986.0833333333333	1,476
1986.25	1,477
1986.5	1,476
1986.6666666666667	1,475
1986.8333333333333	1,475
1987	1,476
1987.1666666666667	1,476
1987.4166666666667	1,476
1987.5833333333333	1,475
1987.75	1,474
1987.9166666666667	1,474
1988.0833333333333	1,475
1988.25	1,475
1988.5	1,474
1988.6666666666667	1,473
1988.8333333333333	1,473
1989	1,473
1989.1666666666667	1,473
1989.4166666666667	1,474
1989.5833333333333	1,474
1989.75	1,473
1989.9166666666667	1,473
1990.0833333333333	1,474
1990.3333333333333	1,474
1990.5	1,474
1990.6666666666667	1,472
1990.8333333333333	1,472
1991	1,472
1991.1666666666667	1,473
1991.4166666666667	1,473
1991.5833333333333	1,472
1991.75	1,471
1991.9166666666667	1,471
1992.0833333333333	1,471
1992.3333333333333	1,472
1992.5	1,471
1992.6666666666667	1,471
1992.8333333333333	1,471
1993	1,471
1993.25	1,471
1993.4166666666667	1,473
1993.5833333333333	1,472
1993.75	1,471
1993.9166666666667	1,472
1994.0833333333333	1,472
1994.3333333333333	1,472
1994.5	1,471
1994.6666666666667	1,470
1994.8333333333333	1,470
1995	1,470
1995.25	1,471
1995.4166666666667	1,472
1995.5833333333333	1,471
1995.75	1,471
1995.9166666666667	1,472
1996.1666666666667	1,473
1996.3333333333333	1,474
1996.5	1,475
1996.6666666666667	1,474
1996.8333333333333	1,474
1997	1,476
1997.25	1,476
1997.4166666666667	1,477
1997.5833333333333	1,477
1997.75	1,476
1997.9166666666667	1,476
1998.1666666666667	1,477
1998.3333333333333	1,477
1998.5	1,477
1998.6666666666667	1,476
1998.8333333333333	1,475
1999.0833333333333	1,476
1999.25	1,476
1999.4166666666667	1,477
1999.5833333333333	1,477
1999.75	1,476
2000	1,477
2000.1666666666667	1,477
2000.3333333333333	1,477
2000.5	1,477
2000.6666666666667	1,476
2000.8333333333333	1,476
2001.0833333333333	1,476
2001.25	1,476
2001.4166666666667	1,476
2001.5833333333333	1,475
2001.75	1,474
2002	1,474
2002.1666666666667	1,474
2002.3333333333333	1,475
2002.5	1,475
2002.6666666666667	1,474
2002.9166666666667	1,474
2003.0833333333333	1,474
2003.25	1,474
2003.4166666666667	1,474
2003.5833333333333	1,473
2003.75	1,473
2004	1,473
2004.1666666666667	1,473
2004.3333333333333	1,473
2004.5	1,474
2004.6666666666667	1,473
2004.9166666666667	1,473
2005.0833333333333	1,473
2005.25	1,473
2005.4166666666667	1,473
2005.5833333333333	1,472
2005.8333333333333	1,471
2006	1,472
2006.1666666666667	1,472
2006.3333333333333	1,473
2006.5	1,474
2006.6666666666667	1,473
2006.9166666666667	1,473
2007.0833333333333	1,474
2007.25	1,474
2007.4166666666667	1,475
2007.5833333333333	1,474
2007.8333333333333	1,473
2008	1,474
2008.1666666666667	1,474
2008.3333333333333	1,475
2008.5	1,476
2008.75	1,475
2008.9166666666667	1,475
2009.0833333333333	1,476
2009.25	1,476
2009.4166666666667	1,477
2009.5833333333333	1,476
2009.8333333333333	1,475
2010	1,476
2010.1666666666667	1,476
2010.3333333333333	1,476
2010.5	1,476
2010.75	1,475
2010.9166666666667	1,476
2011.0833333333333	1,476
2011.25	1,476
2011.4166666666667	1,477
2011.6666666666667	1,477
2011.8333333333333	1,477
2012	1,477
2012.1666666666667	1,477
2012.3333333333333	1,477
2012.5833333333333	1,476
2012.75	1,476
2012.9166666666667	1,477
2013.0833333333333	1,476
2013.25	1,476
2013.4166666666667	1,477
2013.6666666666667	1,475
2013.8333333333333	1,475
2014	1,475
2014.1666666666667	1,476
2014.3333333333333	1,477
2014.5833333333333	1,476
2014.75	1,475
2014.9166666666667	1,476
2015.0833333333333	1,476
2015.25	1,476
2015.5	1,476
2015.6666666666667	1,475
2015.8333333333333	1,474
2016	1,475
2016.1666666666667	1,475
2016.3333333333333	1,475
2016.5833333333333	1,475
2016.75	1,474
2016.9166666666667	1,475
2017.0833333333333	1,475
2017.25	1,475
2017.5	1,477
2017.6666666666667	1,476
2017.8333333333333	1,476
2018	1,477
2018.1666666666667	1,477
2018.4166666666667	1,477
2018.5833333333333	1,476
2018.75	1,475
2018.9166666666667	1,475
2019.0833333333333	1,475
2019.25	1,475
2019.5	1,475
2019.6666666666667	1,474
2019.8333333333333	1,474
2020	1,474
2020.1666666666667	1,474
2020.4166666666667	1,474
2020.5833333333333	1,473
2020.75	1,472
2020.9166666666667	1,472
2021.0833333333333	1,472
2021.3333333333333	1,472
2021.5	1,472
2021.6666666666667	1,471
2021.8333333333333	1,471
2022	1,471
2022.1666666666667	1,471
2022.4166666666667	1,472
2022.5833333333333	1,471
2022.75	1,471
2022.9166666666667	1,471
2023.0833333333333	1,471
2023.3333333333333	1,471
2023.5	1,471
2023.6666666666667	1,471
2023.8333333333333	1,471
2024	1,471
2024.25	1,471
2024.4166666666667	1,472
2024.5833333333333	1,471
2024.75	1,471
2024.9166666666667	1,471
2025.0833333333333	1,472
2025.3333333333333	1,472
2025.5	1,473
2025.6666666666667	1,472
2025.8333333333333	1,472
2026	1,472
2026.25	1,473
2026.4166666666667	1,472
2026.5833333333333	1,471

Rate and persistence

-1.11 Mm³

Mean drawdown per month over 12 months

13 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

Crescent Lake And Crescent Lake

Gauge location

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 exist	Measured
Period held	1928–2026
Completeness	44.2% 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.
Continuity	44% of the months between 1928 and 2026 are held. Monthly means of the publisher's own daily record.
Last read from the publisher	2026-09-01
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

Use this data

Machine-readable JSON /api/v1/observations/by-subject/reservoir-usbr-7173.json
How to cite this, and who you must credit
How these figures were produced
Request this at a different scale, format or geography

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), Crescent Lake And Crescent Lake reservoir records, accessed 2026-09-02, hydrionis.com/reservoirs/reservoir-usbr-7173/

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 Crescent Lake And Crescent 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

525 monthly observations 1928–2026 Mm³

Spatially aggregatedHigh confidenceAugust 2026

Source: USBR — Reservoir operations and Colorado River data, RISE catalogue item 129879. 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.