Navajo Reservoir, NM — storage

Storage now, against this reservoir's own record

1,600.85 Mm³

Stored, September 2017

41st

Percentile among 52 Seps on record

-2.0%

Against the Sep 1991–2020 average

-1.8%

Change over the 12 months to 2017-09

Storage in September 2017 was around the middle of the Sep record, ranked against 52 other Seps held for this reservoir.

Storage, 1965–2017

Monthly mean storage

624 monthly values, 1965 to 2017

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 624 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 624 would be longer than this page and unusable with a screen reader.
Period	Navajo Reservoir Nr Archuleta, NM (Mm³)
October 1965	885
January 1966	430
March 1966	289
June 1966	565
August 1966	636
November 1966	513
February 1967	478
April 1967	452
July 1967	743
September 1967	773
December 1967	748
March 1968	729
May 1968	790
August 1968	1,262
October 1968	1,238
January 1969	1,193
April 1969	1,062
June 1969	1,371
September 1969	1,410
December 1969	1,322
February 1970	1,193
May 1970	1,161
July 1970	1,408
October 1970	1,524
January 1971	1,227
March 1971	1,014
June 1971	1,184
August 1971	1,223
November 1971	1,253
February 1972	1,109
April 1972	1,027
July 1972	1,165
September 1972	1,117
December 1972	1,232
March 1973	1,144
May 1973	1,648
August 1973	1,929
October 1973	1,661
January 1974	1,319
April 1974	1,210
June 1974	1,295
September 1974	1,260
November 1974	1,230
February 1975	1,161
May 1975	1,434
July 1975	1,861
October 1975	1,672
January 1976	1,415
March 1976	1,343
June 1976	1,556
August 1976	1,590
November 1976	1,572
February 1977	1,395
April 1977	1,353
July 1977	1,311
September 1977	1,290
December 1977	1,220
March 1978	1,167
May 1978	1,335
August 1978	1,575
October 1978	1,513
January 1979	1,466
April 1979	1,465
June 1979	1,840
September 1979	1,700
November 1979	1,639
February 1980	1,387
May 1980	1,558
July 1980	2,048
October 1980	1,884
December 1980	1,748
March 1981	1,531
June 1981	1,637
August 1981	1,601
November 1981	1,552
February 1982	1,485
April 1982	1,563
July 1982	1,809
September 1982	1,825
December 1982	1,849
March 1983	1,652
May 1983	1,669
August 1983	2,062
October 1983	2,007
January 1984	1,857
April 1984	1,662
June 1984	2,018
September 1984	2,034
November 1984	1,998
February 1985	1,744
May 1985	1,900
July 1985	2,033
October 1985	1,974
December 1985	1,797
March 1986	1,499
June 1986	2,002
August 1986	1,947
November 1986	1,924
January 1987	1,677
April 1987	1,409
July 1987	1,462
September 1987	1,367
December 1987	1,338
February 1988	1,296
May 1988	1,416
August 1988	1,494
October 1988	1,489
January 1989	1,406
April 1989	1,568
June 1989	1,729
September 1989	1,632
November 1989	1,570
February 1990	1,477
May 1990	1,532
July 1990	1,695
October 1990	1,696
December 1990	1,710
March 1991	1,704
June 1991	1,945
August 1991	1,942
November 1991	1,926
January 1992	1,906
April 1992	1,996
July 1992	1,958
September 1992	1,952
December 1992	1,894
February 1993	1,876
May 1993	1,784
August 1993	1,961
October 1993	1,996
January 1994	1,913
March 1994	1,925
June 1994	2,001
September 1994	1,736
November 1994	1,722
February 1995	1,711
May 1995	1,788
July 1995	1,939
October 1995	1,902
December 1995	1,822
March 1996	1,770
June 1996	1,715
August 1996	1,553
November 1996	1,458
January 1997	1,468
April 1997	1,614
July 1997	1,782
September 1997	1,841
December 1997	1,938
February 1998	1,866
May 1998	1,910
August 1998	1,754
October 1998	1,704
January 1999	1,731
March 1999	1,699
June 1999	1,871
September 1999	1,966
November 1999	1,892
February 2000	1,817
April 2000	1,843
July 2000	1,819
October 2000	1,647
December 2000	1,601
March 2001	1,566
May 2001	1,849
August 2001	1,794
November 2001	1,683
January 2002	1,632
April 2002	1,544
July 2002	1,297
September 2002	1,099
December 2002	1,028
February 2003	999
May 2003	1,037
August 2003	944
October 2003	890
January 2004	874
March 2004	908
June 2004	1,255
September 2004	1,139
November 2004	1,185
February 2005	1,309
April 2005	1,575
July 2005	1,936
October 2005	1,888
December 2005	1,898
March 2006	1,859
May 2006	1,934
August 2006	1,756
November 2006	1,906
January 2007	1,913
April 2007	1,992
June 2007	1,992
September 2007	1,885
December 2007	1,838
February 2008	1,757
May 2008	1,728
August 2008	1,674
October 2008	1,619
January 2009	1,567
March 2009	1,566
June 2009	1,815
September 2009	1,637
November 2009	1,572
February 2010	1,504
April 2010	1,616
July 2010	1,856
October 2010	1,726
December 2010	1,686
March 2011	1,635
May 2011	1,707
August 2011	1,717
November 2011	1,638
January 2012	1,607
April 2012	1,641
June 2012	1,578
September 2012	1,313
December 2012	1,188
February 2013	1,163
May 2013	1,181
July 2013	1,134
October 2013	1,165
January 2014	1,190
March 2014	1,211
June 2014	1,458
September 2014	1,320
November 2014	1,353
February 2015	1,348
April 2015	1,442
July 2015	1,812
October 2015	1,709
December 2015	1,725
March 2016	1,757
May 2016	1,885
August 2016	1,666
November 2016	1,601
January 2017	1,607
April 2017	1,892
June 2017	1,824
September 2017	1,601

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	1,600	1,607
Feb	1,590	1,629
Mar	1,602	1,708
Apr	1,655	1,892
May	1,716	1,950
Jun	1,737	1,824
Jul	1,709	1,695
Aug	1,669	1,659
Sep	1,634	1,601
Oct	1,623	1,610
Nov	1,619	1,601
Dec	1,609	1,598

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

-2.45 Mm³

Mean drawdown 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

Navajo Reservoir Nr Archuleta, 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	1965–2017
Completeness	98.1% 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	98% of the months between 1965 and 2017 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-09355100.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), Navajo Reservoir Nr Archuleta, NM reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-09355100/

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 Navajo Reservoir Nr Archuleta, 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

624 monthly observations 1965–2017 Mm³

Spatially aggregatedHigh confidenceSeptember 2017

Source: USGS — National Water Information System, 09355100. 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.