Lake Mohave — storage

Storage now, against this reservoir's own record

2,051.75 Mm³

Stored, September 2026

87th

Percentile among 77 Seps on record

+2.0%

Against the Sep 1991–2020 average

+1.6%

Change over the 12 months to 2026-09

Storage in September 2026 was higher than most Seps on record, ranked against 77 other Seps held for this reservoir.

Storage, 1950–2026

Monthly mean storage

920 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 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 (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
April 1955	2,163
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
June 1959	2,109
September 1959	1,688
January 1960	2,114
May 1960	1,908
September 1960	1,760
January 1961	2,065
May 1961	2,162
August 1961	1,713
December 1961	1,961
April 1962	2,098
August 1962	1,719
December 1962	1,964
April 1963	2,096
July 1963	1,883
November 1963	1,695
March 1964	2,083
July 1964	1,957
November 1964	1,770
March 1965	2,093
July 1965	2,035
October 1965	1,711
February 1966	2,116
June 1966	2,082
October 1966	1,732
February 1967	2,026
June 1967	2,116
September 1967	1,841
January 1968	2,067
May 1968	2,140
September 1968	1,713
January 1969	1,947
May 1969	2,141
September 1969	1,776
December 1969	1,874
April 1970	1,960
August 1970	1,882
December 1970	1,834
April 1971	2,054
August 1971	1,806
November 1971	1,823
March 1972	2,060
July 1972	1,967
November 1972	1,944
March 1973	2,118
July 1973	1,918
November 1973	1,733
February 1974	1,974
June 1974	2,008
October 1974	1,719
February 1975	1,983
June 1975	2,011
October 1975	1,703
January 1976	1,974
May 1976	2,123
September 1976	2,049
January 1977	2,138
May 1977	2,186
September 1977	1,841
January 1978	2,063
April 1978	1,963
August 1978	1,720
December 1978	2,073
April 1979	1,941
August 1979	1,792
December 1979	1,958
March 1980	1,995
July 1980	1,880
November 1980	1,879
March 1981	2,109
July 1981	1,935
November 1981	1,810
March 1982	2,080
June 1982	2,117
October 1982	1,705
February 1983	2,105
June 1983	2,138
October 1983	1,823
February 1984	2,109
May 1984	1,919
September 1984	1,978
January 1985	2,061
May 1985	2,142
September 1985	1,965
January 1986	1,927
May 1986	2,037
August 1986	1,834
December 1986	1,836
April 1987	2,144
August 1987	1,733
December 1987	1,895
April 1988	2,117
July 1988	1,950
November 1988	1,854
March 1989	2,086
July 1989	2,071
November 1989	1,812
March 1990	2,082
June 1990	1,965
October 1990	1,801
February 1991	2,073
June 1991	1,983
October 1991	1,936
February 1992	2,082
June 1992	2,017
September 1992	1,997
January 1993	2,116
May 1993	1,983
September 1993	1,795
January 1994	1,981
May 1994	2,163
August 1994	1,929
December 1994	1,883
April 1995	2,098
August 1995	2,019
December 1995	1,891
April 1996	2,069
August 1996	2,045
November 1996	1,843
March 1997	2,108
July 1997	2,071
November 1997	1,821
March 1998	2,058
July 1998	2,093
October 1998	2,091
February 1999	2,115
June 1999	2,093
October 1999	1,739
February 2000	2,052
June 2000	2,138
October 2000	1,735
January 2001	2,073
May 2001	2,136
September 2001	2,017
January 2002	2,060
May 2002	2,091
September 2002	2,045
December 2002	1,962
April 2003	2,044
August 2003	2,126
December 2003	1,893
April 2004	2,068
August 2004	2,069
December 2004	1,915
March 2005	2,110
July 2005	2,055
November 2005	1,841
March 2006	2,049
July 2006	2,061
November 2006	1,819
February 2007	2,049
June 2007	2,117
October 2007	1,836
February 2008	2,011
June 2008	2,135
October 2008	1,812
February 2009	2,081
May 2009	2,110
September 2009	1,962
January 2010	2,058
May 2010	2,070
September 2010	1,995
January 2011	2,090
April 2011	2,083
August 2011	2,075
December 2011	1,872
April 2012	2,073
August 2012	2,102
December 2012	1,880
April 2013	2,100
July 2013	2,129
November 2013	1,859
March 2014	2,078
July 2014	2,079
November 2014	1,828
March 2015	2,114
June 2015	2,140
October 2015	1,905
February 2016	2,036
June 2016	2,116
October 2016	1,883
February 2017	2,104
May 2017	2,104
September 2017	2,062
January 2018	2,072
May 2018	2,082
September 2018	1,997
January 2019	2,019
May 2019	2,086
August 2019	2,091
December 2019	2,071
April 2020	2,121
August 2020	2,097
December 2020	1,953
April 2021	2,065
July 2021	2,109
November 2021	1,871
March 2022	2,073
July 2022	2,112
November 2022	1,916
March 2023	2,107
July 2023	2,092
October 2023	1,877
February 2024	2,080
June 2024	2,103
October 2024	1,884
February 2025	2,058
June 2025	2,113
September 2025	2,019
January 2026	2,093
May 2026	2,183
September 2026	2,052

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	2,052
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

921 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 921 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 921 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
1957.4166666666667	196
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
1961.5833333333333	192
1961.8333333333333	193
1962.1666666666667	196
1962.5	194
1962.8333333333333	193
1963.1666666666667	196
1963.5	194
1963.8333333333333	192
1964.0833333333333	196
1964.4166666666667	196
1964.75	192
1965.0833333333333	196
1965.4166666666667	196
1965.75	192
1966	197
1966.3333333333333	196
1966.6666666666667	192
1967	195
1967.3333333333333	196
1967.6666666666667	194
1968	196
1968.25	196
1968.5833333333333	193
1968.9166666666667	193
1969.25	196
1969.5833333333333	194
1969.9166666666667	194
1970.25	195
1970.5	195
1970.8333333333333	193
1971.1666666666667	196
1971.5	195
1971.8333333333333	193
1972.1666666666667	196
1972.4166666666667	196
1972.75	194
1973.0833333333333	196
1973.4166666666667	196
1973.75	192
1974.0833333333333	195
1974.4166666666667	195
1974.6666666666667	192
1975	195
1975.3333333333333	195
1975.6666666666667	193
1976	195
1976.3333333333333	196
1976.5833333333333	195
1976.9166666666667	196
1977.25	196
1977.5833333333333	193
1977.9166666666667	195
1978.25	195
1978.5833333333333	192
1978.8333333333333	195
1979.1666666666667	196
1979.5	194
1979.8333333333333	194
1980.1666666666667	195
1980.5	194
1980.8333333333333	194
1981.0833333333333	196
1981.4166666666667	196
1981.75	193
1982.0833333333333	196
1982.4166666666667	196
1982.75	192
1983	196
1983.3333333333333	196
1983.6666666666667	196
1984	196
1984.3333333333333	194
1984.6666666666667	195
1985	196
1985.25	197
1985.5833333333333	196
1985.9166666666667	193
1986.25	195
1986.5833333333333	194
1986.9166666666667	194
1987.25	196
1987.5	194
1987.8333333333333	194
1988.1666666666667	197
1988.5	195
1988.8333333333333	194
1989.1666666666667	196
1989.4166666666667	197
1989.75	192
1990.0833333333333	196
1990.4166666666667	195
1990.75	193
1991.0833333333333	196
1991.4166666666667	195
1991.6666666666667	194
1992	197
1992.3333333333333	195
1992.6666666666667	195
1993	196
1993.3333333333333	195
1993.6666666666667	193
1993.9166666666667	194
1994.25	196
1994.5833333333333	194
1994.9166666666667	194
1995.25	196
1995.5833333333333	195
1995.8333333333333	194
1996.1666666666667	196
1996.5	196
1996.8333333333333	194
1997.1666666666667	196
1997.5	196
1997.8333333333333	193
1998.0833333333333	196
1998.4166666666667	196
1998.75	196
1999.0833333333333	196
1999.4166666666667	196
1999.75	193
2000.0833333333333	196
2000.3333333333333	196
2000.6666666666667	195
2001	196
2001.3333333333333	196
2001.6666666666667	195
2002	196
2002.25	196
2002.5833333333333	196
2002.9166666666667	195
2003.25	196
2003.5833333333333	196
2003.9166666666667	194
2004.25	196
2004.5	196
2004.8333333333333	193
2005.1666666666667	196
2005.5	196
2005.8333333333333	194
2006.1666666666667	196
2006.4166666666667	196
2006.75	194
2007.0833333333333	196
2007.4166666666667	196
2007.75	194
2008.0833333333333	195
2008.4166666666667	196
2008.6666666666667	195
2009	195
2009.3333333333333	196
2009.6666666666667	195
2010	196
2010.3333333333333	196
2010.6666666666667	195
2010.9166666666667	194
2011.25	196
2011.5833333333333	196
2011.9166666666667	194
2012.25	196
2012.5833333333333	196
2012.8333333333333	193
2013.1666666666667	196
2013.5	196
2013.8333333333333	194
2014.1666666666667	196
2014.5	196
2014.8333333333333	194
2015.0833333333333	196
2015.4166666666667	196
2015.75	194
2016.0833333333333	195
2016.4166666666667	196
2016.75	194
2017.0833333333333	196
2017.3333333333333	196
2017.6666666666667	196
2018	196
2018.3333333333333	196
2018.6666666666667	195
2019	195
2019.25	196
2019.5833333333333	196
2019.9166666666667	196
2020.25	196
2020.5833333333333	196
2020.9166666666667	195
2021.25	196
2021.5	196
2021.8333333333333	194
2022.1666666666667	196
2022.5	196
2022.8333333333333	194
2023.1666666666667	196
2023.5	196
2023.75	194
2024.0833333333333	196
2024.4166666666667	196
2024.75	194
2025.0833333333333	196
2025.4166666666667	196
2025.6666666666667	195
2026	195
2026.3333333333333	196
2026.6666666666667	195

Rate and persistence

+2.69 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	99.6% 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	100% of the months between 1950 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-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 2026-10-05, 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

920 monthly observations 1950–2026 Mm³

Spatially aggregatedHigh confidenceSeptember 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 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.