HydrionisGlobal Water Intelligence
Monitored reservoir

Topaz Lake Nr Topaz, CA

United States Geological Survey reservoir gauge 10297000 in NV, with published storage from 1987.

Storage record10297000

Storage now, against this reservoir's own record

28.29 Mm³
Stored, September 2026
68th
Percentile among 39 Seps on record
+26.5%
Against the Sep 1991–2020 average
-2.6%
Change over the 12 months to 2026-09

Storage in September 2026 was around the middle of the Sep record, ranked against 39 other Seps held for this reservoir.

Storage, 1987–2026

Monthly mean storage
468 monthly values, 1987 to 2026
Monthly mean storageMonthly mean storage: Topaz Lake Nr Topaz, CA in Mm³, from 1987.75 to 2026.6666666666667.020406080Mm³1987.751992.66666666666671997.58333333333332002.52007.41666666666672012.33333333333332017.252022.1666666666667Year

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 468 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 468 would be longer than this page and unusable with a screen reader.
PeriodTopaz Lake Nr Topaz, CA (Mm³)
October 19872.07
December 19878.79
February 198818.8
April 198823.4
June 198818.6
August 19883.27
October 19880
December 19882.66
February 198911.0
April 198921.6
June 198941.9
July 198937.1
September 19899.02
November 19895.38
January 199015.1
March 199024.3
May 199020.0
July 19909.50
September 19900.501
November 19900.174
January 19914.17
March 19918.49
May 19919.98
July 199119.2
September 19910.633
November 19910.578
January 19927.58
March 199214.5
May 199212.8
July 19926.99
September 19921.50
November 19920.406
January 19933.98
February 19937.71
April 199315.8
June 199343.4
August 199346.2
October 199317.2
December 199322.1
February 199430.4
April 199433.1
June 199430.5
August 19949.58
October 19943.90
December 19948.86
February 199520.5
April 199541.6
June 199550.3
August 199571.2
October 199543.0
December 199548.6
February 199666.0
April 199668.8
June 199666.4
August 199653.6
September 199634.0
November 199628.4
January 199754.6
March 199747.4
May 199754.9
July 199765.5
September 199725.0
November 199717.5
January 199827.7
March 199843.8
May 199836.9
July 199871.5
September 199848.5
November 199851.3
January 199964.0
March 199971.2
May 199957.3
July 199966.5
September 199921.0
November 199913.0
January 200017.5
March 200026.7
April 200029.0
June 200062.9
August 200031.7
October 20006.51
December 200011.4
February 200120.8
April 200128.1
June 200144.5
August 200121.7
October 200112.4
December 200115.8
February 200224.1
April 200228.5
June 200240.8
August 200221.0
October 20027.43
December 200211.1
February 200320.9
April 200324.2
June 200364.5
August 200339.8
September 200323.5
November 20039.30
January 200416.3
March 200424.6
May 200425.3
July 200419.6
September 20043.64
November 20045.76
January 200515.4
March 200528.1
May 200544.5
July 200572.8
September 200539.0
November 200525.6
January 200650.9
March 200669.2
May 200661.4
July 200672.1
September 200634.4
November 200625.6
January 200735.4
March 200742.4
April 200741.8
June 200736.5
August 200717.7
October 20079.46
December 20077.60
February 200814.3
April 200817.9
June 200832.1
August 200819.8
October 20089.01
December 200813.7
February 200921.0
April 200923.6
June 200961.9
August 200943.9
October 200918.8
December 200921.0
February 201031.7
April 201037.8
June 201063.9
August 201051.6
October 201020.2
November 201023.9
January 201146.9
March 201159.6
May 201153.9
July 201171.6
September 201147.3
November 201138.1
January 201247.1
March 201255.2
May 201255.0
July 201234.5
September 201211.8
November 20125.00
January 201312.9
March 201318.4
May 201320.6
July 201315.6
September 20137.93
November 20135.96
January 20147.03
March 20149.79
April 201410.3
June 20148.42
August 20144.70
October 20143.02
December 20144.21
February 20159.51
April 201511.6
June 201511.1
August 20154.18
October 20153.57
December 20158.15
February 201618.8
April 201622.4
June 201652.6
August 201631.9
October 201615.2
December 201630.2
February 201756.3
April 201722.4
June 201759.8
August 201766.4
October 201747.9
November 201752.5
January 201868.4
March 201872.4
May 201871.2
July 201857.4
September 201831.4
November 201825.8
January 201933.8
March 201948.2
May 201947.9
July 201966.0
September 201937.7
November 201925.0
January 202036.4
March 202043.0
May 202047.2
July 202034.0
September 202013.1
November 20208.43
January 202114.1
March 202120.2
May 202120.9
June 202120.3
August 202110.6
October 20217.06
December 202126.3
February 202238.7
April 202241.6
June 202244.3
August 202228.2
October 202214.5
December 202220.0
February 202344.5
April 202319.4
June 202337.3
August 202361.5
October 202336.2
December 202345.7
February 202461.6
April 202471.9
June 202471.1
August 202443.3
October 202420.6
December 202425.0
January 202530.2
March 202541.0
May 202548.2
July 202555.0
September 202529.0
November 202528.2
January 202648.7
March 202668.8
May 202671.3
July 202655.5
September 202628.3

The reservoir's year

Seasonal storage profile
Each calendar month's reference average, against the most recent year
Seasonal storage profileSeasonal storage profile: 1991–2020 average, Most recent 12 months in Mm³, from 1 to 12.020406080Mm³123456789101112Month1991–2020 average 1: 27.2 Mm³1991–2020 average 2: 32.0 Mm³1991–2020 average 3: 35.4 Mm³1991–2020 average 4: 35.9 Mm³1991–2020 average 5: 36.3 Mm³1991–2020 average 6: 46.9 Mm³1991–2020 average 7: 46.4 Mm³1991–2020 average 8: 35.1 Mm³1991–2020 average 9: 22.4 Mm³1991–2020 average 10: 16.6 Mm³1991–2020 average 11: 17.4 Mm³1991–2020 average 12: 22.0 Mm³Most recent 12 months 1: 48.7 Mm³Most recent 12 months 2: 58.2 Mm³Most recent 12 months 3: 68.8 Mm³Most recent 12 months 4: 70.6 Mm³Most recent 12 months 5: 71.3 Mm³Most recent 12 months 6: 69.7 Mm³Most recent 12 months 7: 55.5 Mm³Most recent 12 months 8: 38.7 Mm³Most recent 12 months 9: 28.3 Mm³Most recent 12 months 10: 24.3 Mm³Most recent 12 months 11: 28.2 Mm³Most recent 12 months 12: 37.3 Mm³
  • 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
Period1991–2020 average (Mm³)Most recent 12 months (Mm³)
Jan27.248.7
Feb32.058.2
Mar35.468.8
Apr35.970.6
May36.371.3
Jun46.969.7
Jul46.455.5
Aug35.138.7
Sep22.428.3
Oct16.624.3
Nov17.428.2
Dec22.037.3

Why this page shows a volume and not a percentage

Rate and persistence

-0.06 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

Topaz Lake Nr Topaz, CA
Gauge location
Topaz Lake Nr Topaz, CATopaz Lake Nr Topaz, CA — 28.29 Mm³Topaz Lake Nr Topaz, CA — 28.29 Mm³

About this data

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 existMeasured
Period held1987–2026
Completeness97.5% 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.
Continuity98% of the months between 1987 and 2026 are held. Monthly means of the publisher's own daily record.
Last read from the publisher2026-10-01
RedistributionPermitted by the upstream licences
Commercial reusePermitted by the upstream licences. No Hydrionis access tier can widen this.
MethodologyHow this was produced

Use this data

Use this data

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), Topaz Lake Nr Topaz, CA reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-10297000/

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 Topaz Lake Nr Topaz, CA 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

468 monthly observations 1987–2026 Mm³
Spatially aggregatedHigh confidenceSeptember 2026

Source: USGS — National Water Information System, 10297000. 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.

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