Wickiup Reservoir — storage

Storage now, against this reservoir's own record

67.27 Mm³

Stored, August 2026

30th

Percentile among 44 Augs on record

-32.0%

Against the Aug 1991–2020 average

-36.7%

Change over the 12 months to 2026-08

Storage in August 2026 was around the middle of the Aug record, ranked against 44 other Augs held for this reservoir.

Storage, 1983–2026

Monthly mean storage

524 monthly values, 1983 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 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	Wickiup Reservoir (Mm³)
January 1983	238
March 1983	241
May 1983	241
August 1983	171
October 1983	155
December 1983	203
February 1984	235
April 1984	245
July 1984	213
September 1984	146
November 1984	195
January 1985	214
March 1985	235
May 1985	221
August 1985	99.7
October 1985	107
December 1985	187
February 1986	244
April 1986	244
July 1986	142
September 1986	84.9
November 1986	155
January 1987	215
March 1987	246
June 1987	156
August 1987	80.6
October 1987	49.3
December 1987	126
February 1988	190
April 1988	227
July 1988	109
September 1988	31.3
November 1988	91.0
January 1989	161
March 1989	211
June 1989	172
August 1989	78.3
October 1989	55.8
December 1989	145
February 1990	208
May 1990	187
July 1990	105
September 1990	48.4
November 1990	81.2
January 1991	148
March 1991	203
June 1991	149
August 1991	56.7
October 1991	24.4
December 1991	96.3
February 1992	161
May 1992	181
July 1992	95.8
September 1992	32.6
November 1992	72.5
January 1993	142
April 1993	210
June 1993	206
August 1993	118
October 1993	95.5
December 1993	168
February 1994	223
May 1994	191
July 1994	80.7
September 1994	25.2
November 1994	65.9
January 1995	125
April 1995	205
June 1995	167
August 1995	87.3
October 1995	68.1
December 1995	142
March 1996	246
May 1996	245
July 1996	180
September 1996	134
November 1996	181
January 1997	242
April 1997	243
June 1997	223
August 1997	189
October 1997	167
December 1997	199
March 1998	244
May 1998	235
July 1998	204
September 1998	141
November 1998	171
February 1999	228
April 1999	228
June 1999	197
August 1999	157
October 1999	149
January 2000	224
March 2000	241
May 2000	229
July 2000	163
September 2000	117
November 2000	158
February 2001	225
April 2001	241
June 2001	160
August 2001	96.5
October 2001	67.7
January 2002	163
March 2002	209
May 2002	192
July 2002	106
September 2002	43.6
December 2002	130
February 2003	188
April 2003	231
June 2003	163
August 2003	74.8
October 2003	44.0
January 2004	152
March 2004	203
May 2004	188
July 2004	116
September 2004	59.3
December 2004	135
February 2005	196
April 2005	229
June 2005	178
August 2005	79.8
November 2005	85.5
January 2006	156
March 2006	217
May 2006	225
July 2006	187
September 2006	115
December 2006	200
February 2007	235
April 2007	245
June 2007	169
August 2007	92.2
November 2007	122
January 2008	192
March 2008	235
May 2008	207
July 2008	149
October 2008	120
December 2008	195
February 2009	237
April 2009	241
June 2009	204
August 2009	119
November 2009	148
January 2010	210
March 2010	244
May 2010	207
July 2010	130
October 2010	55.5
December 2010	147
February 2011	218
April 2011	247
June 2011	217
September 2011	134
November 2011	182
January 2012	223
March 2012	241
May 2012	241
August 2012	163
October 2012	140
December 2012	206
February 2013	228
April 2013	242
June 2013	168
September 2013	58.4
November 2013	124
January 2014	192
March 2014	240
May 2014	214
August 2014	88.7
October 2014	67.3
December 2014	153
February 2015	228
April 2015	240
July 2015	106
September 2015	27.8
November 2015	78.9
January 2016	152
March 2016	206
May 2016	189
August 2016	61.5
October 2016	42.6
December 2016	122
February 2017	183
April 2017	213
July 2017	144
September 2017	84.7
November 2017	146
January 2018	204
March 2018	243
June 2018	143
August 2018	45.1
October 2018	13.2
December 2018	86.4
February 2019	139
April 2019	170
July 2019	82.1
September 2019	23.4
November 2019	71.0
January 2020	126
March 2020	166
June 2020	110
August 2020	30.3
October 2020	10.8
December 2020	68.1
February 2021	117
May 2021	103
July 2021	28.2
September 2021	3.92
November 2021	35.8
January 2022	89.3
March 2022	128
June 2022	89.7
August 2022	36.7
October 2022	15.6
December 2022	79.9
February 2023	133
May 2023	149
July 2023	89.8
September 2023	41.1
November 2023	69.2
January 2024	125
April 2024	190
June 2024	149
August 2024	82.8
October 2024	54.2
December 2024	120
February 2025	181
May 2025	209
July 2025	135
September 2025	87.9
November 2025	123
January 2026	183
April 2026	224
June 2026	135
August 2026	67.3

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	182	183
Feb	204	208
Mar	222	225
Apr	228	224
May	207	184
Jun	176	135
Jul	136	93.0
Aug	98.9	67.3
Sep	74.1	87.9
Oct	80.5	87.8
Nov	118	123
Dec	151	154

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	Wickiup Reservoir (m)
1983	1,322
1983.1666666666667	1,322
1983.3333333333333	1,322
1983.5833333333333	1,320
1983.75	1,320
1983.9166666666667	1,321
1984.0833333333333	1,322
1984.25	1,322
1984.5	1,321
1984.6666666666667	1,319
1984.8333333333333	1,321
1985	1,321
1985.1666666666667	1,322
1985.3333333333333	1,322
1985.5833333333333	1,317
1985.75	1,318
1985.9166666666667	1,321
1986.0833333333333	1,322
1986.25	1,322
1986.5	1,319
1986.6666666666667	1,316
1986.8333333333333	1,320
1987	1,321
1987.1666666666667	1,322
1987.4166666666667	1,320
1987.5833333333333	1,316
1987.75	1,312
1987.9166666666667	1,319
1988.0833333333333	1,321
1988.25	1,322
1988.5	1,318
1988.6666666666667	1,310
1988.8333333333333	1,316
1989	1,320
1989.1666666666667	1,321
1989.4166666666667	1,320
1989.5833333333333	1,315
1989.75	1,313
1989.9166666666667	1,319
1990.0833333333333	1,321
1990.3333333333333	1,321
1990.5	1,317
1990.6666666666667	1,312
1990.8333333333333	1,316
1991	1,319
1991.1666666666667	1,321
1991.4166666666667	1,319
1991.5833333333333	1,313
1991.75	1,309
1991.9166666666667	1,317
1992.0833333333333	1,320
1992.3333333333333	1,320
1992.5	1,317
1992.6666666666667	1,310
1992.8333333333333	1,315
1993	1,319
1993.25	1,321
1993.4166666666667	1,321
1993.5833333333333	1,318
1993.75	1,317
1993.9166666666667	1,320
1994.0833333333333	1,322
1994.3333333333333	1,321
1994.5	1,316
1994.6666666666667	1,309
1994.8333333333333	1,314
1995	1,319
1995.25	1,321
1995.4166666666667	1,320
1995.5833333333333	1,316
1995.75	1,314
1995.9166666666667	1,319
1996.1666666666667	1,322
1996.3333333333333	1,322
1996.5	1,320
1996.6666666666667	1,319
1996.8333333333333	1,320
1997	1,322
1997.25	1,322
1997.4166666666667	1,322
1997.5833333333333	1,321
1997.75	1,320
1997.9166666666667	1,321
1998.1666666666667	1,322
1998.3333333333333	1,322
1998.5	1,321
1998.6666666666667	1,319
1998.8333333333333	1,320
1999.0833333333333	1,322
1999.25	1,322
1999.4166666666667	1,321
1999.5833333333333	1,320
1999.75	1,319
2000	1,322
2000.1666666666667	1,322
2000.3333333333333	1,322
2000.5	1,320
2000.6666666666667	1,318
2000.8333333333333	1,320
2001.0833333333333	1,322
2001.25	1,322
2001.4166666666667	1,320
2001.5833333333333	1,317
2001.75	1,314
2002	1,320
2002.1666666666667	1,321
2002.3333333333333	1,321
2002.5	1,317
2002.6666666666667	1,312
2002.9166666666667	1,319
2003.0833333333333	1,321
2003.25	1,322
2003.4166666666667	1,320
2003.5833333333333	1,315
2003.75	1,312
2004	1,320
2004.1666666666667	1,321
2004.3333333333333	1,321
2004.5	1,318
2004.6666666666667	1,314
2004.9166666666667	1,319
2005.0833333333333	1,321
2005.25	1,322
2005.4166666666667	1,320
2005.5833333333333	1,316
2005.8333333333333	1,316
2006	1,320
2006.1666666666667	1,321
2006.3333333333333	1,322
2006.5	1,321
2006.6666666666667	1,318
2006.9166666666667	1,321
2007.0833333333333	1,322
2007.25	1,322
2007.4166666666667	1,320
2007.5833333333333	1,317
2007.8333333333333	1,318
2008	1,321
2008.1666666666667	1,322
2008.3333333333333	1,321
2008.5	1,319
2008.75	1,318
2008.9166666666667	1,321
2009.0833333333333	1,322
2009.25	1,322
2009.4166666666667	1,321
2009.5833333333333	1,318
2009.8333333333333	1,319
2010	1,321
2010.1666666666667	1,322
2010.3333333333333	1,321
2010.5	1,319
2010.75	1,313
2010.9166666666667	1,319
2011.0833333333333	1,321
2011.25	1,322
2011.4166666666667	1,321
2011.6666666666667	1,319
2011.8333333333333	1,320
2012	1,322
2012.1666666666667	1,322
2012.3333333333333	1,322
2012.5833333333333	1,320
2012.75	1,319
2012.9166666666667	1,321
2013.0833333333333	1,322
2013.25	1,322
2013.4166666666667	1,320
2013.6666666666667	1,313
2013.8333333333333	1,318
2014	1,321
2014.1666666666667	1,322
2014.3333333333333	1,321
2014.5833333333333	1,316
2014.75	1,314
2014.9166666666667	1,320
2015.0833333333333	1,322
2015.25	1,322
2015.5	1,317
2015.6666666666667	1,309
2015.8333333333333	1,315
2016	1,320
2016.1666666666667	1,321
2016.3333333333333	1,321
2016.5833333333333	1,314
2016.75	1,311
2016.9166666666667	1,318
2017.0833333333333	1,321
2017.25	1,321
2017.5	1,319
2017.6666666666667	1,316
2017.8333333333333	1,319
2018	1,321
2018.1666666666667	1,322
2018.4166666666667	1,319
2018.5833333333333	1,312
2018.75	1,306
2018.9166666666667	1,316
2019.0833333333333	1,319
2019.25	1,320
2019.5	1,316
2019.6666666666667	1,309
2019.8333333333333	1,315
2020	1,319
2020.1666666666667	1,320
2020.4166666666667	1,318
2020.5833333333333	1,310
2020.75	1,306
2020.9166666666667	1,314
2021.0833333333333	1,318
2021.3333333333333	1,317
2021.5	1,309
2021.6666666666667	1,304
2021.8333333333333	1,311
2022	1,316
2022.1666666666667	1,319
2022.4166666666667	1,316
2022.5833333333333	1,311
2022.75	1,307
2022.9166666666667	1,316
2023.0833333333333	1,319
2023.3333333333333	1,319
2023.5	1,316
2023.6666666666667	1,311
2023.8333333333333	1,315
2024	1,319
2024.25	1,321
2024.4166666666667	1,319
2024.5833333333333	1,316
2024.75	1,313
2024.9166666666667	1,318
2025.0833333333333	1,320
2025.3333333333333	1,321
2025.5	1,319
2025.6666666666667	1,316
2025.8333333333333	1,318
2026	1,321
2026.25	1,322
2026.4166666666667	1,319
2026.5833333333333	1,314

Rate and persistence

-3.26 Mm³

Mean drawdown per month over 12 months

3 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

Wickiup 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	1983–2026
Completeness	99.2% 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	99% of the months between 1983 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-7201.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), Wickiup Reservoir reservoir records, accessed 2026-09-02, hydrionis.com/reservoirs/reservoir-usbr-7201/

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 Wickiup 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

524 monthly observations 1983–2026 Mm³

Spatially aggregatedHigh confidenceAugust 2026

Source: USBR — Reservoir operations and Colorado River data, RISE catalogue item 133726. 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.