Lake Mohave — storage

Storage now, against this reservoir's own record

2,164.16 Mm³

Stored, August 2026

99th

Percentile among 77 Augs on record

+5.1%

Against the Aug 1991–2020 average

+3.4%

Change over the 12 months to 2026-08

Storage in August 2026 was higher than almost every other Aug on record, ranked against 77 other Augs held for this reservoir.

Storage, 1950–2026

Monthly mean storage

919 monthly values, 1950 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 919 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 919 would be longer than this page and unusable with a screen reader.
Period	Lake Mohave (Mm³)
February 1950	275
June 1950	298
October 1950	588
February 1951	1,728
May 1951	1,998
September 1951	1,644
January 1952	1,958
May 1952	1,964
September 1952	1,970
January 1953	1,986
April 1953	2,065
August 1953	1,522
December 1953	2,057
April 1954	2,204
August 1954	1,965
December 1954	2,092
March 1955	2,141
July 1955	1,753
November 1955	1,506
March 1956	2,080
July 1956	1,934
November 1956	1,598
March 1957	2,078
June 1957	2,116
October 1957	1,777
February 1958	2,042
June 1958	2,106
October 1958	1,876
February 1959	2,079
May 1959	2,122
September 1959	1,688
January 1960	2,114
May 1960	1,908
September 1960	1,760
January 1961	2,065
April 1961	2,101
August 1961	1,713
December 1961	1,961
April 1962	2,098
August 1962	1,719
December 1962	1,964
March 1963	2,115
July 1963	1,883
November 1963	1,695
March 1964	2,083
July 1964	1,957
November 1964	1,770
March 1965	2,093
June 1965	2,152
October 1965	1,711
February 1966	2,116
June 1966	2,082
October 1966	1,732
February 1967	2,026
May 1967	2,137
September 1967	1,841
January 1968	2,067
May 1968	2,140
September 1968	1,713
January 1969	1,947
April 1969	2,077
August 1969	1,856
December 1969	1,874
April 1970	1,960
August 1970	1,882
December 1970	1,834
April 1971	2,054
July 1971	1,956
November 1971	1,823
March 1972	2,060
July 1972	1,967
November 1972	1,944
March 1973	2,118
June 1973	2,135
October 1973	1,710
February 1974	1,974
June 1974	2,008
October 1974	1,719
February 1975	1,983
May 1975	1,937
September 1975	1,765
January 1976	1,974
May 1976	2,123
September 1976	2,049
January 1977	2,138
April 1977	2,056
August 1977	1,824
December 1977	1,936
April 1978	1,963
August 1978	1,720
December 1978	2,073
April 1979	1,941
July 1979	1,845
November 1979	1,829
March 1980	1,995
July 1980	1,880
November 1980	1,879
March 1981	2,109
June 1981	2,087
October 1981	1,820
February 1982	2,047
June 1982	2,117
October 1982	1,705
February 1983	2,105
May 1983	2,061
September 1983	2,074
January 1984	2,048
May 1984	1,919
September 1984	1,978
January 1985	2,061
May 1985	2,142
August 1985	2,118
December 1985	1,809
April 1986	2,003
August 1986	1,834
December 1986	1,836
April 1987	2,144
July 1987	1,892
November 1987	1,904
March 1988	2,165
July 1988	1,950
November 1988	1,854
March 1989	2,086
June 1989	2,180
October 1989	1,710
February 1990	2,113
June 1990	1,965
October 1990	1,801
February 1991	2,073
May 1991	1,979
September 1991	1,868
January 1992	2,153
May 1992	1,967
September 1992	1,997
January 1993	2,116
May 1993	1,983
August 1993	1,945
December 1993	1,902
April 1994	2,083
August 1994	1,929
December 1994	1,883
April 1995	2,098
July 1995	2,038
November 1995	1,878
March 1996	2,048
July 1996	2,064
November 1996	1,843
March 1997	2,108
June 1997	2,129
October 1997	1,973
February 1998	2,060
June 1998	2,118
October 1998	2,091
February 1999	2,115
June 1999	2,093
September 1999	1,983
January 2000	2,008
May 2000	2,131
September 2000	2,034
January 2001	2,073
May 2001	2,136
August 2001	2,058
December 2001	1,942
April 2002	2,079
August 2002	2,072
December 2002	1,962
April 2003	2,044
July 2003	2,098
November 2003	1,847
March 2004	2,104
July 2004	2,089
November 2004	1,827
March 2005	2,110
June 2005	2,121
October 2005	1,883
February 2006	2,018
June 2006	2,058
October 2006	1,871
February 2007	2,049
June 2007	2,117
September 2007	2,003
January 2008	1,992
May 2008	2,060
September 2008	2,033
January 2009	1,973
May 2009	2,110
August 2009	2,032
December 2009	1,908
April 2010	2,055
August 2010	2,079
December 2010	1,922
April 2011	2,083
July 2011	2,079
November 2011	1,803
March 2012	2,048
July 2012	2,104
November 2012	1,817
March 2013	2,059
July 2013	2,129
October 2013	1,989
February 2014	2,061
June 2014	2,103
October 2014	1,902
February 2015	2,083
June 2015	2,140
September 2015	2,035
January 2016	2,021
May 2016	2,127
September 2016	2,060
January 2017	2,113
May 2017	2,104
August 2017	2,124
December 2017	1,996
April 2018	2,077
August 2018	2,071
December 2018	1,981
April 2019	2,089
July 2019	2,080
November 2019	1,971
March 2020	2,137
July 2020	2,096
November 2020	1,921
March 2021	2,085
July 2021	2,109
October 2021	1,850
February 2022	2,061
June 2022	2,122
October 2022	1,861
February 2023	2,076
June 2023	2,084
September 2023	2,049
January 2024	2,035
May 2024	2,092
September 2024	2,012
January 2025	1,991
May 2025	2,106
August 2025	2,092
December 2025	2,063
April 2026	2,167
August 2026	2,164

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	2,038	2,093
Feb	2,065	2,135
Mar	2,081	2,142
Apr	2,076	2,167
May	2,093	2,183
Jun	2,095	2,175
Jul	2,065	2,182
Aug	2,060	2,164
Sep	2,012	2,019
Oct	1,874	1,989
Nov	1,851	2,043
Dec	1,933	2,063

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

920 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 920 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 920 would be longer than this page and unusable with a screen reader.
Period	Lake Mohave (m)
1950	167
1950.3333333333333	174
1950.6666666666667	176
1951	190
1951.25	194
1951.5833333333333	190
1951.9166666666667	195
1952.25	195
1952.5833333333333	195
1952.9166666666667	195
1953.1666666666667	195
1953.5	192
1953.8333333333333	194
1954.1666666666667	197
1954.5	196
1954.8333333333333	196
1955.1666666666667	196
1955.4166666666667	196
1955.75	190
1956.0833333333333	196
1956.4166666666667	196
1956.75	190
1957.0833333333333	196
1957.3333333333333	197
1957.6666666666667	192
1958	194
1958.3333333333333	197
1958.6666666666667	194
1959	196
1959.3333333333333	196
1959.5833333333333	192
1959.9166666666667	195
1960.25	194
1960.5833333333333	192
1960.9166666666667	194
1961.25	196
1961.5	194
1961.8333333333333	193
1962.1666666666667	196
1962.5	194
1962.8333333333333	193
1963.1666666666667	196
1963.4166666666667	196
1963.75	192
1964.0833333333333	196
1964.4166666666667	196
1964.75	192
1965.0833333333333	196
1965.4166666666667	196
1965.6666666666667	192
1966	197
1966.3333333333333	196
1966.6666666666667	192
1967	195
1967.3333333333333	196
1967.5833333333333	194
1967.9166666666667	196
1968.25	196
1968.5833333333333	193
1968.9166666666667	193
1969.25	196
1969.5833333333333	194
1969.8333333333333	193
1970.1666666666667	196
1970.5	195
1970.8333333333333	193
1971.1666666666667	196
1971.5	195
1971.75	193
1972.0833333333333	195
1972.4166666666667	196
1972.75	194
1973.0833333333333	196
1973.4166666666667	196
1973.75	192
1974	196
1974.3333333333333	195
1974.6666666666667	192
1975	195
1975.3333333333333	195
1975.6666666666667	193
1975.9166666666667	194
1976.25	195
1976.5833333333333	195
1976.9166666666667	196
1977.25	196
1977.5833333333333	193
1977.9166666666667	195
1978.1666666666667	196
1978.5	193
1978.8333333333333	195
1979.1666666666667	196
1979.5	194
1979.8333333333333	194
1980.0833333333333	196
1980.4166666666667	196
1980.75	193
1981.0833333333333	196
1981.4166666666667	196
1981.75	193
1982.0833333333333	196
1982.3333333333333	197
1982.6666666666667	194
1983	196
1983.3333333333333	196
1983.6666666666667	196
1984	196
1984.25	195
1984.5833333333333	196
1984.9166666666667	193
1985.25	197
1985.5833333333333	196
1985.9166666666667	193
1986.25	195
1986.5	195
1986.8333333333333	193
1987.1666666666667	196
1987.5	194
1987.8333333333333	194
1988.1666666666667	197
1988.4166666666667	196
1988.75	194
1989.0833333333333	196
1989.4166666666667	197
1989.75	192
1990.0833333333333	196
1990.3333333333333	195
1990.6666666666667	194
1991	196
1991.3333333333333	195
1991.6666666666667	194
1992	197
1992.3333333333333	195
1992.5833333333333	195
1992.9166666666667	195
1993.25	195
1993.5833333333333	195
1993.9166666666667	194
1994.25	196
1994.5	195
1994.8333333333333	193
1995.1666666666667	196
1995.5	195
1995.8333333333333	194
1996.1666666666667	196
1996.5	196
1996.75	194
1997.0833333333333	196
1997.4166666666667	196
1997.75	195
1998.0833333333333	196
1998.4166666666667	196
1998.6666666666667	196
1999	195
1999.3333333333333	196
1999.6666666666667	195
2000	195
2000.3333333333333	196
2000.6666666666667	195
2000.9166666666667	195
2001.25	196
2001.5833333333333	196
2001.9166666666667	195
2002.25	196
2002.5833333333333	196
2002.8333333333333	194
2003.1666666666667	196
2003.5	196
2003.8333333333333	194
2004.1666666666667	196
2004.5	196
2004.8333333333333	193
2005.0833333333333	196
2005.4166666666667	196
2005.75	194
2006.0833333333333	195
2006.4166666666667	196
2006.75	194
2007	195
2007.3333333333333	196
2007.6666666666667	195
2008	195
2008.3333333333333	196
2008.6666666666667	195
2009	195
2009.25	195
2009.5833333333333	195
2009.9166666666667	194
2010.25	196
2010.5833333333333	196
2010.9166666666667	194
2011.1666666666667	196
2011.5	196
2011.8333333333333	193
2012.1666666666667	196
2012.5	196
2012.8333333333333	193
2013.1666666666667	196
2013.4166666666667	196
2013.75	195
2014.0833333333333	196
2014.4166666666667	196
2014.75	194
2015.0833333333333	196
2015.3333333333333	196
2015.6666666666667	195
2016	195
2016.3333333333333	196
2016.6666666666667	196
2017	196
2017.25	196
2017.5833333333333	196
2017.9166666666667	195
2018.25	196
2018.5833333333333	196
2018.9166666666667	195
2019.25	196
2019.5	196
2019.8333333333333	195
2020.1666666666667	196
2020.5	196
2020.8333333333333	194
2021.1666666666667	196
2021.4166666666667	196
2021.75	194
2022.0833333333333	196
2022.4166666666667	196
2022.75	194
2023.0833333333333	196
2023.4166666666667	196
2023.6666666666667	196
2024	195
2024.3333333333333	196
2024.6666666666667	195
2025	195
2025.3333333333333	196
2025.5833333333333	196
2025.9166666666667	195
2026.25	196
2026.5833333333333	196

Rate and persistence

+5.98 Mm³

Mean change 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

Lake Mohave

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	1950–2026
Completeness	99.5% 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 1950 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-3513.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), Lake Mohave reservoir records, accessed 2026-09-02, hydrionis.com/reservoirs/reservoir-usbr-3513/

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 Lake Mohave 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

919 monthly observations 1950–2026 Mm³

Spatially aggregatedHigh confidenceAugust 2026

Source: USBR — Reservoir operations and Colorado River data, RISE catalogue item 6134. 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.