Nambe Falls Reservoir, NM — storage

Storage now, against this reservoir's own record

1.17 Mm³

Stored, September 2026

17th

Percentile among 43 Seps on record

-23.0%

Against the Sep 1991–2020 average

-36.9%

Change over the 12 months to 2026-09

Storage in September 2026 was lower than most Seps on record, ranked against 43 other Seps held for this reservoir.

Storage, 1984–2026

Monthly mean storage

513 monthly values, 1984 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 513 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 513 would be longer than this page and unusable with a screen reader.
Period	Nambe Falls Reservoir Near Nambe, NM (Mm³)
January 1984	2.41
March 1984	2.43
May 1984	2.51
July 1984	2.01
October 1984	1.47
December 1984	1.88
February 1985	2.37
April 1985	2.50
June 1985	2.51
August 1985	2.32
October 1985	2.31
January 1986	2.40
March 1986	2.46
May 1986	2.49
July 1986	2.50
September 1986	2.38
November 1986	2.44
January 1987	2.41
April 1987	2.50
June 1987	2.51
August 1987	1.84
October 1987	1.84
December 1987	2.16
February 1988	2.38
April 1988	2.49
July 1988	2.49
September 1988	2.50
November 1988	2.46
January 1989	2.41
March 1989	2.47
May 1989	2.28
July 1989	1.36
October 1989	1.36
December 1989	1.29
February 1990	1.60
April 1990	2.30
June 1990	2.43
August 1990	1.62
October 1990	1.93
January 1991	2.36
March 1991	2.39
May 1991	2.41
July 1991	2.31
September 1991	2.50
November 1991	2.40
January 1992	2.36
April 1992	2.47
June 1992	2.51
August 1992	2.07
October 1992	1.62
December 1992	2.02
February 1993	2.36
April 1993	1.97
July 1993	2.41
September 1993	2.49
November 1993	1.93
January 1994	2.16
March 1994	2.41
May 1994	2.34
July 1994	1.98
October 1994	1.75
December 1994	2.08
February 1995	2.36
April 1995	2.03
June 1995	2.51
August 1995	1.74
October 1995	1.58
January 1996	1.93
March 1996	2.32
May 1996	1.59
July 1996	1.19
September 1996	0.582
November 1996	1.16
January 1997	1.79
April 1997	2.40
June 1997	2.51
August 1997	2.35
October 1997	1.57
December 1997	1.79
February 1998	2.20
April 1998	2.21
July 1998	2.43
September 1998	1.74
November 1998	1.74
January 1999	2.19
March 1999	2.42
May 1999	2.31
July 1999	2.33
October 1999	1.94
December 1999	2.23
February 2000	2.35
April 2000	2.43
June 2000	1.64
August 2000	1.26
October 2000	1.18
January 2001	1.69
March 2001	2.06
May 2001	2.51
July 2001	1.98
September 2001	1.36
November 2001	1.14
January 2002	1.46
April 2002	1.91
June 2002	1.13
August 2002	1.18
October 2002	0.939
December 2002	0.927
February 2003	1.20
April 2003	1.65
July 2003	1.55
September 2003	1.19
November 2003	1.19
January 2004	0.628
March 2004	0.975
May 2004	2.12
July 2004	0.884
October 2004	0.655
December 2004	0.958
February 2005	1.67
April 2005	2.49
June 2005	2.51
August 2005	1.68
October 2005	1.65
December 2005	2.42
March 2006	2.49
May 2006	1.81
July 2006	1.09
September 2006	1.13
November 2006	1.44
January 2007	1.97
March 2007	2.47
June 2007	2.50
August 2007	2.01
October 2007	1.30
December 2007	1.73
February 2008	2.24
April 2008	2.50
June 2008	2.50
September 2008	1.66
November 2008	1.86
January 2009	2.32
March 2009	2.49
May 2009	2.51
July 2009	2.32
September 2009	1.41
December 2009	1.89
February 2010	2.32
April 2010	2.51
June 2010	2.46
August 2010	2.36
October 2010	1.56
December 2010	1.97
March 2011	2.49
May 2011	1.83
July 2011	1.09
September 2011	1.07
November 2011	1.25
January 2012	1.74
March 2012	2.33
June 2012	1.99
August 2012	1.21
October 2012	1.36
December 2012	1.65
February 2013	2.09
April 2013	2.52
June 2013	1.70
September 2013	1.91
November 2013	2.50
January 2014	2.41
March 2014	2.52
May 2014	2.52
July 2014	2.26
September 2014	1.79
December 2014	1.34
February 2015	1.64
April 2015	2.53
June 2015	2.51
August 2015	2.36
October 2015	1.35
December 2015	2.11
March 2016	2.50
May 2016	2.51
July 2016	2.05
September 2016	1.89
November 2016	1.84
January 2017	2.40
March 2017	2.51
June 2017	2.50
August 2017	1.85
October 2017	2.04
December 2017	2.39
February 2018	2.47
April 2018	2.49
June 2018	1.57
September 2018	1.49
November 2018	1.79
January 2019	2.23
March 2019	2.48
May 2019	2.51
July 2019	2.50
September 2019	1.63
December 2019	1.98
February 2020	2.45
April 2020	2.49
June 2020	2.30
August 2020	1.07
October 2020	1.21
December 2020	1.58
March 2021	1.78
May 2021	1.82
July 2021	1.36
September 2021	1.58
November 2021	1.71
January 2022	2.02
March 2022	2.12
June 2022	1.66
August 2022	2.15
October 2022	2.07
December 2022	2.06
February 2023	2.00
April 2023	2.15
June 2023	2.14
September 2023	1.09
November 2023	1.21
January 2024	1.63
March 2024	2.04
May 2024	2.04
July 2024	1.83
September 2024	1.74
December 2024	1.81
February 2025	1.90
April 2025	1.89
June 2025	2.03
August 2025	1.56
October 2025	1.84
December 2025	1.84
March 2026	2.02
May 2026	1.66
July 2026	1.21
September 2026	1.17

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	2.00	1.87
Feb	2.15	1.92
Mar	2.26	2.02
Apr	2.33	1.98
May	2.29	1.66
Jun	2.20	1.46
Jul	1.90	1.21
Aug	1.72	1.06
Sep	1.52	1.17
Oct	1.50	1.84
Nov	1.62	1.88
Dec	1.81	1.84

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.

Rate and persistence

-0.06 Mm³

Mean drawdown per month over 12 months

10 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

Nambe Falls Reservoir Near Nambe, NM

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 Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Measured
Period held	1984–2026
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 1984 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-usgs-08294200.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), Nambe Falls Reservoir Near Nambe, NM reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-08294200/

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 Nambe Falls Reservoir Near Nambe, NM 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

513 monthly observations 1984–2026 Mm³

Spatially aggregatedHigh confidenceSeptember 2026

Source: USGS — National Water Information System, 08294200. Licence: Open.

Method: Monthly mean of daily reservoir storage published by the USGS in acre-feet and converted to millions of cubic metres. Months with fewer than 20 days of record are not published rather than averaged from a partial month.

Reservoir storage is managed as well as observed: a drawdown may reflect an operating rule, flood-control rule curve or scheduled release rather than a shortage. Compare a month against the same month in other years, and do not read a fall as a supply signal without knowing the operating regime.

Retrieved 1 October 2026.

Monthly mean of daily reservoir storage published by the USGS in acre-feet and converted to millions of cubic metres. Months with fewer than 20 days of record are not published rather than averaged from a partial month.