Crescent Lake And Crescent Lake — storage

Storage now, against this reservoir's own record

11.53 Mm³

Stored, September 2026

14th

Percentile among 44 Seps on record

-79.2%

Against the Sep 1991–2020 average

-48.7%

Change over the 12 months to 2026-09

Storage in September 2026 was lower than most Seps on record, ranked against 44 other Seps held for this reservoir.

Storage, 1928–2026

Monthly mean storage

526 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 526 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 526 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
April 1986	97.9
June 1986	96.9
August 1986	75.8
October 1986	69.7
December 1986	77.3
March 1987	84.8
May 1987	90.9
July 1987	81.7
September 1987	58.5
November 1987	56.5
February 1988	63.2
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
January 1991	29.1
March 1991	33.3
May 1991	36.4
July 1991	37.5
September 1991	14.4
December 1991	15.7
February 1992	16.8
April 1992	19.7
June 1992	20.4
August 1992	8.26
November 1992	7.64
January 1993	7.66
March 1993	8.47
May 1993	22.2
July 1993	36.5
October 1993	16.9
December 1993	20.6
February 1994	23.2
April 1994	24.5
June 1994	25.1
September 1994	2.63
November 1994	2.85
January 1995	3.57
March 1995	8.93
May 1995	15.4
August 1995	14.0
October 1995	5.69
December 1995	20.5
February 1996	37.6
April 1996	46.4
July 1996	65.2
September 1996	48.1
November 1996	57.5
January 1997	88.4
March 1997	87.7
June 1997	105
August 1997	99.7
October 1997	87.2
December 1997	93.1
February 1998	99.8
May 1998	101
July 1998	96.5
September 1998	79.0
November 1998	76.5
January 1999	88.6
April 1999	86.6
June 1999	96.1
August 1999	103
October 1999	93.5
December 1999	96.7
February 2000	100
May 2000	102
July 2000	101
September 2000	81.5
November 2000	81.9
January 2001	86.8
April 2001	89.3
June 2001	86.4
August 2001	64.4
October 2001	54.5
December 2001	58.1
March 2002	59.9
May 2002	64.8
July 2002	69.4
September 2002	49.4
November 2002	47.6
February 2003	54.5
April 2003	58.9
June 2003	61.2
August 2003	47.1
October 2003	35.2
January 2004	40.2
March 2004	42.2
May 2004	47.3
July 2004	53.7
September 2004	35.9
December 2004	36.9
February 2005	37.7
April 2005	38.2
June 2005	44.1
August 2005	25.7
November 2005	15.5
January 2006	24.0
March 2006	28.5
May 2006	33.7
July 2006	48.9
October 2006	36.5
December 2006	44.9
February 2007	52.6
April 2007	58.7
June 2007	67.4
September 2007	44.4
November 2007	47.7
January 2008	55.9
March 2008	60.2
May 2008	64.2
August 2008	72.7
October 2008	67.3
December 2008	73.1
February 2009	78.2
April 2009	81.0
July 2009	96.2
September 2009	80.3
November 2009	77.8
January 2010	81.5
March 2010	82.5
May 2010	84.6
August 2010	82.5
October 2010	72.1
December 2010	78.0
February 2011	86.3
April 2011	91.3
July 2011	106
September 2011	99.3
November 2011	98.2
January 2012	103
March 2012	99.9
June 2012	98.6
August 2012	90.1
October 2012	88.3
December 2012	96.3
February 2013	87.8
May 2013	94.9
July 2013	89.4
September 2013	72.5
November 2013	72.3
January 2014	74.4
April 2014	91.5
June 2014	93.7
August 2014	84.6
October 2014	69.9
December 2014	78.7
March 2015	92.3
May 2015	92.5
July 2015	83.8
September 2015	64.5
November 2015	60.3
February 2016	64.9
April 2016	68.1
June 2016	74.9
August 2016	69.2
October 2016	59.6
January 2017	66.1
March 2017	72.4
May 2017	83.0
July 2017	95.5
September 2017	87.7
December 2017	94.6
February 2018	95.8
April 2018	97.3
June 2018	100.0
August 2018	84.7
November 2018	72.6
January 2019	72.6
March 2019	72.6
May 2019	79.2
July 2019	77.5
October 2019	56.1
December 2019	54.1
February 2020	55.4
April 2020	53.6
June 2020	58.2
September 2020	32.5
November 2020	27.6
January 2021	28.4
March 2021	28.5
May 2021	29.2
July 2021	24.8
October 2021	8.31
December 2021	9.38
February 2022	9.76
April 2022	9.63
June 2022	20.2
September 2022	9.43
November 2022	8.11
January 2023	10.2
March 2023	9.87
May 2023	15.0
August 2023	12.1
October 2023	7.65
December 2023	10.4
February 2024	15.9
April 2024	17.8
July 2024	22.9
September 2024	12.5
November 2024	13.1
January 2025	19.5
March 2025	23.6
June 2025	37.0
August 2025	28.6
October 2025	22.1
December 2025	26.2
February 2026	30.0
May 2026	33.2
July 2026	22.1
September 2026	11.5

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	15.1
Sep	55.4	11.5
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

525 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 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 (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
1985.4166666666667	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
1988.3333333333333	1,475
1988.5	1,474
1988.6666666666667	1,473
1988.8333333333333	1,473
1989	1,473
1989.25	1,473
1989.4166666666667	1,474
1989.5833333333333	1,474
1989.75	1,473
1989.9166666666667	1,473
1990.1666666666667	1,474
1990.3333333333333	1,474
1990.5	1,474
1990.6666666666667	1,472
1990.8333333333333	1,472
1991	1,472
1991.25	1,473
1991.4166666666667	1,473
1991.5833333333333	1,472
1991.75	1,471
1991.9166666666667	1,471
1992.1666666666667	1,471
1992.3333333333333	1,472
1992.5	1,471
1992.6666666666667	1,471
1992.8333333333333	1,471
1993.0833333333333	1,471
1993.25	1,471
1993.4166666666667	1,473
1993.5833333333333	1,472
1993.75	1,471
1994	1,472
1994.1666666666667	1,472
1994.3333333333333	1,472
1994.5	1,471
1994.6666666666667	1,470
1994.9166666666667	1,470
1995.0833333333333	1,471
1995.25	1,471
1995.4166666666667	1,472
1995.5833333333333	1,471
1995.75	1,471
1996	1,472
1996.1666666666667	1,473
1996.3333333333333	1,474
1996.5	1,475
1996.6666666666667	1,474
1996.9166666666667	1,475
1997.0833333333333	1,476
1997.25	1,476
1997.4166666666667	1,477
1997.5833333333333	1,477
1997.8333333333333	1,476
1998	1,477
1998.1666666666667	1,477
1998.3333333333333	1,477
1998.5	1,477
1998.75	1,475
1998.9166666666667	1,476
1999.0833333333333	1,476
1999.25	1,476
1999.4166666666667	1,477
1999.6666666666667	1,477
1999.8333333333333	1,476
2000	1,477
2000.1666666666667	1,477
2000.3333333333333	1,477
2000.5	1,477
2000.75	1,476
2000.9166666666667	1,476
2001.0833333333333	1,476
2001.25	1,476
2001.4166666666667	1,476
2001.6666666666667	1,474
2001.8333333333333	1,474
2002	1,474
2002.1666666666667	1,474
2002.3333333333333	1,475
2002.5833333333333	1,474
2002.75	1,473
2002.9166666666667	1,474
2003.0833333333333	1,474
2003.25	1,474
2003.5	1,474
2003.6666666666667	1,473
2003.8333333333333	1,473
2004	1,473
2004.1666666666667	1,473
2004.4166666666667	1,474
2004.5833333333333	1,473
2004.75	1,473
2004.9166666666667	1,473
2005.0833333333333	1,473
2005.25	1,473
2005.5	1,473
2005.6666666666667	1,471
2005.8333333333333	1,471
2006	1,472
2006.1666666666667	1,472
2006.4166666666667	1,473
2006.5833333333333	1,473
2006.75	1,473
2006.9166666666667	1,473
2007.0833333333333	1,474
2007.3333333333333	1,475
2007.5	1,474
2007.6666666666667	1,473
2007.8333333333333	1,473
2008	1,474
2008.25	1,474
2008.4166666666667	1,475
2008.5833333333333	1,475
2008.75	1,475
2008.9166666666667	1,475
2009.1666666666667	1,476
2009.3333333333333	1,476
2009.5	1,477
2009.6666666666667	1,476
2009.8333333333333	1,475
2010	1,476
2010.25	1,476
2010.4166666666667	1,476
2010.5833333333333	1,476
2010.75	1,475
2010.9166666666667	1,476
2011.1666666666667	1,476
2011.3333333333333	1,477
2011.5	1,477
2011.6666666666667	1,477
2011.8333333333333	1,477
2012.0833333333333	1,477
2012.25	1,477
2012.4166666666667	1,477
2012.5833333333333	1,476
2012.75	1,476
2013	1,476
2013.1666666666667	1,476
2013.3333333333333	1,477
2013.5	1,476
2013.6666666666667	1,475
2013.9166666666667	1,475
2014.0833333333333	1,476
2014.25	1,476
2014.4166666666667	1,477
2014.5833333333333	1,476
2014.75	1,475
2015	1,476
2015.1666666666667	1,476
2015.3333333333333	1,476
2015.5	1,476
2015.6666666666667	1,475
2015.9166666666667	1,475
2016.0833333333333	1,475
2016.25	1,475
2016.4166666666667	1,475
2016.5833333333333	1,475
2016.8333333333333	1,474
2017	1,475
2017.1666666666667	1,475
2017.3333333333333	1,476
2017.5	1,477
2017.75	1,476
2017.9166666666667	1,477
2018.0833333333333	1,477
2018.25	1,477
2018.4166666666667	1,477
2018.6666666666667	1,475
2018.8333333333333	1,475
2019	1,475
2019.1666666666667	1,475
2019.3333333333333	1,476
2019.5	1,475
2019.75	1,474
2019.9166666666667	1,474
2020.0833333333333	1,474
2020.25	1,474
2020.4166666666667	1,474
2020.6666666666667	1,472
2020.8333333333333	1,472
2021	1,472
2021.1666666666667	1,472
2021.3333333333333	1,472
2021.5833333333333	1,471
2021.75	1,471
2021.9166666666667	1,471
2022.0833333333333	1,471
2022.25	1,471
2022.5	1,472
2022.6666666666667	1,471
2022.8333333333333	1,471
2023	1,471
2023.1666666666667	1,471
2023.4166666666667	1,472
2023.5833333333333	1,471
2023.75	1,471
2023.9166666666667	1,471
2024.0833333333333	1,471
2024.25	1,471
2024.5	1,472
2024.6666666666667	1,471
2024.8333333333333	1,471
2025	1,472
2025.1666666666667	1,472
2025.4166666666667	1,473
2025.5833333333333	1,472
2025.75	1,472
2025.9166666666667	1,472
2026.0833333333333	1,472
2026.3333333333333	1,473
2026.5	1,472
2026.6666666666667	1,471

Rate and persistence

-0.91 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	44.3% 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.
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	2026-10-01
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 2026-10-05, 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

526 monthly observations 1928–2026 Mm³

Spatially aggregatedHigh confidenceSeptember 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 October 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.