Crane Prairie Reservoir — storage

Storage now, against this reservoir's own record

45.76 Mm³

Stored, August 2026

64th

Percentile among 51 Augs on record

+12.7%

Against the Aug 1991–2020 average

-10.5%

Change over the 12 months to 2026-08

Storage in August 2026 was around the middle of the Aug record, ranked against 51 other Augs held for this reservoir.

Storage, 1922–2026

Monthly mean storage

563 monthly values, 1922 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 563 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 563 would be longer than this page and unusable with a screen reader.
Period	Crane Prairie Reservoir (Mm³)
December 1922	7.06
March 1923	13.4
November 1923	54.6
August 1924	0.249
June 1928	10.0
May 1929	8.44
August 1929	0.535
November 1929	1.10
May 1930	18.8
September 1930	0
January 1931	11.1
June 1931	19.1
August 1931	1.25
November 1931	0
June 1932	33.4
August 1932	15.6
August 1933	37.0
April 1934	50.7
May 1937	12.5
July 1983	50.7
September 1983	45.5
November 1983	58.9
February 1984	63.4
April 1984	67.0
June 1984	67.6
September 1984	59.3
November 1984	55.5
January 1985	45.6
April 1985	63.8
June 1985	61.2
September 1985	38.5
November 1985	55.8
January 1986	55.8
April 1986	66.3
June 1986	52.6
August 1986	44.1
November 1986	34.4
January 1987	52.4
March 1987	62.4
June 1987	38.9
August 1987	34.9
October 1987	24.5
January 1988	34.6
March 1988	34.3
May 1988	38.2
August 1988	30.5
October 1988	25.1
January 1989	30.2
March 1989	38.0
May 1989	45.6
August 1989	34.2
October 1989	30.7
December 1989	29.4
March 1990	41.5
May 1990	51.9
July 1990	39.3
October 1990	24.1
December 1990	33.6
February 1991	38.8
May 1991	34.6
July 1991	33.1
September 1991	19.0
December 1991	30.1
February 1992	32.6
April 1992	32.4
July 1992	22.1
September 1992	20.9
December 1992	23.5
February 1993	23.7
April 1993	34.5
July 1993	35.7
September 1993	34.4
November 1993	31.0
February 1994	42.7
April 1994	50.2
June 1994	37.4
September 1994	15.6
November 1994	18.5
January 1995	28.8
April 1995	33.7
June 1995	32.0
August 1995	27.4
November 1995	22.3
January 1996	49.8
April 1996	68.2
June 1996	64.8
August 1996	49.1
November 1996	45.0
January 1997	64.3
March 1997	61.8
June 1997	64.7
August 1997	57.7
October 1997	49.9
January 1998	54.7
March 1998	65.6
May 1998	66.5
August 1998	48.4
October 1998	42.1
December 1998	49.4
March 1999	61.4
May 1999	65.2
July 1999	57.8
October 1999	50.3
December 1999	52.3
March 2000	58.0
May 2000	67.2
July 2000	56.7
October 2000	41.3
December 2000	43.5
February 2001	51.8
May 2001	58.6
July 2001	40.0
September 2001	29.5
December 2001	44.8
February 2002	47.5
April 2002	53.0
July 2002	43.9
September 2002	35.0
November 2002	29.9
February 2003	45.9
April 2003	54.9
July 2003	40.5
September 2003	30.1
November 2003	33.4
February 2004	42.1
April 2004	48.2
June 2004	48.6
September 2004	30.3
November 2004	36.8
January 2005	43.6
April 2005	45.3
June 2005	47.9
August 2005	39.1
November 2005	36.0
January 2006	48.8
March 2006	47.1
June 2006	49.6
August 2006	41.4
November 2006	44.1
January 2007	56.7
March 2007	63.5
June 2007	55.5
August 2007	39.5
October 2007	36.8
January 2008	51.1
March 2008	56.2
May 2008	63.4
August 2008	48.6
October 2008	37.5
December 2008	47.0
March 2009	57.1
May 2009	61.2
July 2009	45.7
October 2009	38.8
December 2009	42.1
February 2010	48.1
May 2010	56.3
July 2010	41.0
October 2010	40.7
December 2010	42.8
February 2011	49.1
May 2011	60.8
July 2011	48.7
September 2011	43.8
December 2011	44.9
February 2012	56.9
April 2012	65.9
July 2012	49.8
September 2012	42.4
November 2012	47.1
February 2013	59.8
April 2013	62.5
June 2013	47.5
September 2013	38.3
November 2013	40.7
February 2014	53.4
April 2014	67.6
June 2014	57.1
September 2014	35.8
November 2014	41.6
January 2015	58.2
April 2015	66.1
June 2015	48.4
August 2015	32.9
November 2015	34.2
January 2016	41.2
March 2016	50.3
June 2016	54.6
August 2016	46.1
October 2016	44.8
January 2017	48.6
March 2017	53.8
May 2017	59.5
August 2017	54.7
October 2017	44.0
January 2018	51.1
March 2018	57.1
May 2018	59.6
August 2018	46.0
October 2018	43.5
December 2018	44.8
March 2019	52.8
May 2019	58.2
July 2019	57.6
October 2019	44.5
December 2019	50.8
February 2020	56.0
May 2020	57.7
July 2020	55.2
September 2020	43.3
December 2020	52.3
February 2021	56.9
May 2021	59.0
July 2021	55.0
September 2021	40.9
December 2021	50.2
February 2022	55.4
April 2022	59.2
July 2022	58.6
September 2022	47.3
November 2022	53.6
February 2023	56.7
April 2023	57.9
June 2023	59.3
September 2023	46.9
November 2023	51.4
January 2024	59.4
April 2024	59.4
June 2024	59.5
August 2024	50.9
November 2024	51.3
January 2025	60.0
April 2025	59.9
June 2025	60.1
August 2025	51.1
November 2025	50.8
January 2026	55.4
March 2026	57.0
June 2026	61.1
August 2026	45.8

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	47.2	55.4
Feb	50.0	54.0
Mar	52.7	57.0
Apr	55.6	61.4
May	55.8	61.3
Jun	52.5	61.1
Jul	46.3	58.6
Aug	40.6	45.8
Sep	37.6	47.3
Oct	36.4	48.7
Nov	38.9	50.8
Dec	43.6	54.0

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

518 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 518 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 518 would be longer than this page and unusable with a screen reader.
Period	Crane Prairie Reservoir (m)
1983.5	1,354
1983.6666666666667	1,354
1983.8333333333333	1,354
1984	1,355
1984.25	1,355
1984.4166666666667	1,355
1984.5833333333333	1,354
1984.75	1,354
1984.9166666666667	1,354
1985.0833333333333	1,354
1985.3333333333333	1,355
1985.5	1,354
1985.6666666666667	1,353
1985.8333333333333	1,354
1986	1,354
1986.1666666666667	1,355
1986.4166666666667	1,354
1986.5833333333333	1,354
1986.75	1,353
1986.9166666666667	1,353
1987.0833333333333	1,354
1987.25	1,354
1987.5	1,353
1987.6666666666667	1,352
1987.8333333333333	1,352
1988	1,353
1988.1666666666667	1,353
1988.3333333333333	1,353
1988.5833333333333	1,353
1988.75	1,352
1988.9166666666667	1,352
1989.0833333333333	1,353
1989.25	1,353
1989.4166666666667	1,354
1989.6666666666667	1,353
1989.8333333333333	1,353
1990	1,353
1990.1666666666667	1,353
1990.3333333333333	1,354
1990.5	1,353
1990.75	1,352
1990.9166666666667	1,353
1991.0833333333333	1,353
1991.25	1,353
1991.4166666666667	1,353
1991.5833333333333	1,352
1991.8333333333333	1,352
1992	1,353
1992.1666666666667	1,353
1992.3333333333333	1,353
1992.5	1,352
1992.6666666666667	1,352
1992.8333333333333	1,352
1993.0833333333333	1,352
1993.25	1,353
1993.4166666666667	1,353
1993.5833333333333	1,353
1993.75	1,353
1993.9166666666667	1,353
1994.1666666666667	1,354
1994.3333333333333	1,354
1994.5	1,353
1994.6666666666667	1,352
1994.8333333333333	1,352
1995	1,353
1995.25	1,353
1995.4166666666667	1,353
1995.5833333333333	1,352
1995.75	1,352
1995.9166666666667	1,353
1996.0833333333333	1,354
1996.3333333333333	1,355
1996.5	1,354
1996.6666666666667	1,354
1996.8333333333333	1,354
1997	1,355
1997.1666666666667	1,355
1997.4166666666667	1,355
1997.5833333333333	1,354
1997.75	1,354
1997.9166666666667	1,354
1998.0833333333333	1,355
1998.25	1,355
1998.5	1,354
1998.6666666666667	1,354
1998.8333333333333	1,354
1999	1,354
1999.1666666666667	1,354
1999.3333333333333	1,355
1999.5833333333333	1,354
1999.75	1,354
1999.9166666666667	1,354
2000.0833333333333	1,354
2000.25	1,355
2000.4166666666667	1,355
2000.6666666666667	1,354
2000.8333333333333	1,353
2001	1,354
2001.1666666666667	1,354
2001.3333333333333	1,354
2001.5	1,353
2001.6666666666667	1,353
2001.9166666666667	1,354
2002.0833333333333	1,354
2002.25	1,354
2002.4166666666667	1,354
2002.5833333333333	1,353
2002.75	1,353
2003	1,353
2003.1666666666667	1,354
2003.3333333333333	1,354
2003.5	1,353
2003.6666666666667	1,353
2003.8333333333333	1,353
2004.0833333333333	1,353
2004.25	1,354
2004.4166666666667	1,354
2004.5833333333333	1,353
2004.75	1,353
2004.9166666666667	1,353
2005.1666666666667	1,353
2005.3333333333333	1,354
2005.5	1,354
2005.6666666666667	1,353
2005.8333333333333	1,353
2006	1,354
2006.25	1,354
2006.4166666666667	1,354
2006.5833333333333	1,353
2006.75	1,353
2006.9166666666667	1,354
2007.0833333333333	1,354
2007.3333333333333	1,355
2007.5	1,354
2007.6666666666667	1,353
2007.8333333333333	1,353
2008	1,354
2008.1666666666667	1,354
2008.4166666666667	1,355
2008.5833333333333	1,354
2008.75	1,353
2008.9166666666667	1,354
2009.0833333333333	1,354
2009.25	1,354
2009.4166666666667	1,354
2009.6666666666667	1,353
2009.8333333333333	1,353
2010	1,354
2010.1666666666667	1,354
2010.3333333333333	1,354
2010.5	1,353
2010.75	1,353
2010.9166666666667	1,353
2011.0833333333333	1,354
2011.25	1,354
2011.4166666666667	1,354
2011.5833333333333	1,354
2011.8333333333333	1,354
2012	1,354
2012.1666666666667	1,354
2012.3333333333333	1,355
2012.5	1,354
2012.6666666666667	1,353
2012.9166666666667	1,354
2013.0833333333333	1,354
2013.25	1,355
2013.4166666666667	1,354
2013.5833333333333	1,353
2013.75	1,353
2014	1,354
2014.1666666666667	1,355
2014.3333333333333	1,355
2014.5	1,354
2014.6666666666667	1,353
2014.8333333333333	1,353
2015.0833333333333	1,354
2015.25	1,355
2015.4166666666667	1,354
2015.5833333333333	1,353
2015.75	1,353
2015.9166666666667	1,353
2016.1666666666667	1,354
2016.3333333333333	1,354
2016.5	1,354
2016.6666666666667	1,354
2016.8333333333333	1,354
2017	1,354
2017.25	1,354
2017.4166666666667	1,354
2017.5833333333333	1,354
2017.75	1,354
2017.9166666666667	1,354
2018.0833333333333	1,354
2018.25	1,354
2018.5	1,354
2018.6666666666667	1,354
2018.8333333333333	1,354
2019	1,354
2019.1666666666667	1,354
2019.3333333333333	1,354
2019.5833333333333	1,354
2019.75	1,354
2019.9166666666667	1,354
2020.0833333333333	1,354
2020.25	1,354
2020.4166666666667	1,354
2020.6666666666667	1,353
2020.8333333333333	1,354
2021	1,354
2021.1666666666667	1,354
2021.3333333333333	1,354
2021.5	1,354
2021.75	1,353
2021.9166666666667	1,354
2022.0833333333333	1,354
2022.25	1,354
2022.4166666666667	1,354
2022.5833333333333	1,354
2022.8333333333333	1,354
2023	1,354
2023.1666666666667	1,354
2023.3333333333333	1,354
2023.5	1,354
2023.6666666666667	1,354
2023.9166666666667	1,354
2024.0833333333333	1,354
2024.25	1,354
2024.4166666666667	1,354
2024.5833333333333	1,354
2024.75	1,354
2025	1,354
2025.1666666666667	1,354
2025.3333333333333	1,354
2025.5	1,354
2025.6666666666667	1,354
2025.8333333333333	1,354
2026.0833333333333	1,354
2026.25	1,354
2026.4166666666667	1,354
2026.5833333333333	1,354

Rate and persistence

-0.45 Mm³

Mean drawdown 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

Crane Prairie Reservoir

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	1922–2026
Completeness	44.7% 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	45% of the months between 1922 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-7172.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), Crane Prairie Reservoir reservoir records, accessed 2026-09-02, hydrionis.com/reservoirs/reservoir-usbr-7172/

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 Crane Prairie Reservoir 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

563 monthly observations 1922–2026 Mm³

Spatially aggregatedHigh confidenceAugust 2026

Source: USBR — Reservoir operations and Colorado River data, RISE catalogue item 129873. 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.