Wickiup Reservoir — storage

Storage now, against this reservoir's own record

41.92 Mm³

Stored, September 2026

30th

Percentile among 44 Seps on record

-43.4%

Against the Sep 1991–2020 average

-52.3%

Change over the 12 months to 2026-09

Storage in September 2026 was around the middle of the Sep record, ranked against 44 other Seps held for this reservoir.

Storage, 1983–2026

Monthly mean storage

525 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 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	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
June 1985	193
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
May 1988	205
July 1988	109
September 1988	31.3
November 1988	91.0
January 1989	161
April 1989	232
June 1989	172
August 1989	78.3
October 1989	55.8
December 1989	145
March 1990	230
May 1990	187
July 1990	105
September 1990	48.4
November 1990	81.2
January 1991	148
April 1991	221
June 1991	149
August 1991	56.7
October 1991	24.4
December 1991	96.3
March 1992	189
May 1992	181
July 1992	95.8
September 1992	32.6
November 1992	72.5
February 1993	168
April 1993	210
June 1993	206
August 1993	118
October 1993	95.5
January 1994	198
March 1994	242
May 1994	191
July 1994	80.7
September 1994	25.2
December 1994	97.3
February 1995	154
April 1995	205
June 1995	167
August 1995	87.3
October 1995	68.1
January 1996	184
March 1996	246
May 1996	245
July 1996	180
September 1996	134
December 1996	217
February 1997	238
April 1997	243
June 1997	223
August 1997	189
November 1997	184
January 1998	220
March 1998	244
May 1998	235
July 1998	204
October 1998	140
December 1998	200
February 1999	228
April 1999	228
June 1999	197
September 1999	149
November 1999	178
January 2000	224
March 2000	241
May 2000	229
July 2000	163
October 2000	123
December 2000	185
February 2001	225
April 2001	241
June 2001	160
September 2001	68.8
November 2001	100
January 2002	163
March 2002	209
May 2002	192
August 2002	69.2
October 2002	53.7
December 2002	130
February 2003	188
April 2003	231
July 2003	113
September 2003	49.1
November 2003	82.5
January 2004	152
March 2004	203
June 2004	156
August 2004	81.7
October 2004	59.3
December 2004	135
February 2005	196
April 2005	229
July 2005	126
September 2005	41.6
November 2005	85.5
January 2006	156
March 2006	217
June 2006	218
August 2006	144
October 2006	125
December 2006	200
February 2007	235
May 2007	211
July 2007	126
September 2007	68.4
November 2007	122
January 2008	192
April 2008	241
June 2008	192
August 2008	127
October 2008	120
December 2008	195
March 2009	243
May 2009	223
July 2009	164
September 2009	91.9
November 2009	148
January 2010	210
April 2010	243
June 2010	175
August 2010	78.3
October 2010	55.5
December 2010	147
March 2011	241
May 2011	231
July 2011	190
September 2011	134
November 2011	182
February 2012	235
April 2012	247
June 2012	234
August 2012	163
October 2012	140
January 2013	219
March 2013	239
May 2013	201
July 2013	129
September 2013	58.4
December 2013	162
February 2014	220
April 2014	245
June 2014	170
August 2014	88.7
October 2014	67.3
January 2015	193
March 2015	245
May 2015	202
July 2015	106
September 2015	27.8
December 2015	118
February 2016	179
April 2016	210
June 2016	151
August 2016	61.5
November 2016	85.4
January 2017	155
March 2017	205
May 2017	204
July 2017	144
October 2017	104
December 2017	178
February 2018	225
April 2018	240
June 2018	143
September 2018	9.66
November 2018	51.0
January 2019	116
March 2019	161
May 2019	155
July 2019	82.1
October 2019	38.2
December 2019	101
February 2020	148
April 2020	168
June 2020	110
September 2020	5.57
November 2020	40.6
January 2021	95.0
March 2021	135
May 2021	103
August 2021	7.26
October 2021	8.88
December 2021	62.6
February 2022	110
April 2022	132
July 2022	58.8
September 2022	18.4
November 2022	48.0
January 2023	110
March 2023	154
June 2023	124
August 2023	65.2
October 2023	38.0
December 2023	98.7
February 2024	154
April 2024	190
July 2024	108
September 2024	60.4
November 2024	87.7
January 2025	153
March 2025	206
June 2025	178
August 2025	106
October 2025	87.8
December 2025	154
February 2026	208
May 2026	184
July 2026	93.0
September 2026	41.9

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	66.8
Sep	74.1	41.9
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

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	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
1985.4166666666667	1,321
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
1988.3333333333333	1,321
1988.5	1,318
1988.6666666666667	1,310
1988.8333333333333	1,316
1989	1,320
1989.25	1,322
1989.4166666666667	1,320
1989.5833333333333	1,315
1989.75	1,313
1989.9166666666667	1,319
1990.1666666666667	1,322
1990.3333333333333	1,321
1990.5	1,317
1990.6666666666667	1,312
1990.8333333333333	1,316
1991	1,319
1991.25	1,322
1991.4166666666667	1,319
1991.5833333333333	1,313
1991.75	1,309
1991.9166666666667	1,317
1992.1666666666667	1,321
1992.3333333333333	1,320
1992.5	1,317
1992.6666666666667	1,310
1992.8333333333333	1,315
1993.0833333333333	1,320
1993.25	1,321
1993.4166666666667	1,321
1993.5833333333333	1,318
1993.75	1,317
1994	1,321
1994.1666666666667	1,322
1994.3333333333333	1,321
1994.5	1,316
1994.6666666666667	1,309
1994.9166666666667	1,317
1995.0833333333333	1,320
1995.25	1,321
1995.4166666666667	1,320
1995.5833333333333	1,316
1995.75	1,314
1996	1,321
1996.1666666666667	1,322
1996.3333333333333	1,322
1996.5	1,320
1996.6666666666667	1,319
1996.9166666666667	1,321
1997.0833333333333	1,322
1997.25	1,322
1997.4166666666667	1,322
1997.5833333333333	1,321
1997.8333333333333	1,321
1998	1,322
1998.1666666666667	1,322
1998.3333333333333	1,322
1998.5	1,321
1998.75	1,319
1998.9166666666667	1,321
1999.0833333333333	1,322
1999.25	1,322
1999.4166666666667	1,321
1999.6666666666667	1,319
1999.8333333333333	1,320
2000	1,322
2000.1666666666667	1,322
2000.3333333333333	1,322
2000.5	1,320
2000.75	1,318
2000.9166666666667	1,321
2001.0833333333333	1,322
2001.25	1,322
2001.4166666666667	1,320
2001.6666666666667	1,315
2001.8333333333333	1,317
2002	1,320
2002.1666666666667	1,321
2002.3333333333333	1,321
2002.5833333333333	1,315
2002.75	1,313
2002.9166666666667	1,319
2003.0833333333333	1,321
2003.25	1,322
2003.5	1,318
2003.6666666666667	1,312
2003.8333333333333	1,316
2004	1,320
2004.1666666666667	1,321
2004.4166666666667	1,320
2004.5833333333333	1,316
2004.75	1,314
2004.9166666666667	1,319
2005.0833333333333	1,321
2005.25	1,322
2005.5	1,319
2005.6666666666667	1,311
2005.8333333333333	1,316
2006	1,320
2006.1666666666667	1,321
2006.4166666666667	1,321
2006.5833333333333	1,319
2006.75	1,319
2006.9166666666667	1,321
2007.0833333333333	1,322
2007.3333333333333	1,321
2007.5	1,319
2007.6666666666667	1,315
2007.8333333333333	1,318
2008	1,321
2008.25	1,322
2008.4166666666667	1,321
2008.5833333333333	1,319
2008.75	1,318
2008.9166666666667	1,321
2009.1666666666667	1,322
2009.3333333333333	1,322
2009.5	1,320
2009.6666666666667	1,317
2009.8333333333333	1,319
2010	1,321
2010.25	1,322
2010.4166666666667	1,320
2010.5833333333333	1,315
2010.75	1,313
2010.9166666666667	1,319
2011.1666666666667	1,322
2011.3333333333333	1,322
2011.5	1,321
2011.6666666666667	1,319
2011.8333333333333	1,320
2012.0833333333333	1,322
2012.25	1,322
2012.4166666666667	1,322
2012.5833333333333	1,320
2012.75	1,319
2013	1,321
2013.1666666666667	1,322
2013.3333333333333	1,321
2013.5	1,319
2013.6666666666667	1,313
2013.9166666666667	1,320
2014.0833333333333	1,321
2014.25	1,322
2014.4166666666667	1,320
2014.5833333333333	1,316
2014.75	1,314
2015	1,321
2015.1666666666667	1,322
2015.3333333333333	1,321
2015.5	1,317
2015.6666666666667	1,309
2015.9166666666667	1,318
2016.0833333333333	1,320
2016.25	1,321
2016.4166666666667	1,320
2016.5833333333333	1,314
2016.8333333333333	1,316
2017	1,320
2017.1666666666667	1,321
2017.3333333333333	1,321
2017.5	1,319
2017.75	1,317
2017.9166666666667	1,320
2018.0833333333333	1,322
2018.25	1,322
2018.4166666666667	1,319
2018.6666666666667	1,306
2018.8333333333333	1,313
2019	1,318
2019.1666666666667	1,320
2019.3333333333333	1,320
2019.5	1,316
2019.75	1,311
2019.9166666666667	1,317
2020.0833333333333	1,319
2020.25	1,320
2020.4166666666667	1,318
2020.6666666666667	1,304
2020.8333333333333	1,311
2021	1,317
2021.1666666666667	1,319
2021.3333333333333	1,317
2021.5833333333333	1,305
2021.75	1,305
2021.9166666666667	1,314
2022.0833333333333	1,318
2022.25	1,319
2022.5	1,313
2022.6666666666667	1,308
2022.8333333333333	1,312
2023	1,318
2023.1666666666667	1,320
2023.4166666666667	1,318
2023.5833333333333	1,314
2023.75	1,311
2023.9166666666667	1,317
2024.0833333333333	1,320
2024.25	1,321
2024.5	1,318
2024.6666666666667	1,314
2024.8333333333333	1,316
2025	1,320
2025.1666666666667	1,321
2025.4166666666667	1,320
2025.5833333333333	1,318
2025.75	1,316
2025.9166666666667	1,320
2026.0833333333333	1,321
2026.3333333333333	1,321
2026.5	1,317
2026.6666666666667	1,312

Rate and persistence

-3.83 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	99.4% 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	2026-10-01
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-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 2026-10-05, 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

525 monthly observations 1983–2026 Mm³

Spatially aggregatedHigh confidenceSeptember 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 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.