HydrionisGlobal Water Intelligence
Monitored reservoir

Big Sandy Reservoir Near Farson, WY

United States Geological Survey reservoir gauge 09213700 in WY, with published storage from 1987.

Storage record09213700

Storage now, against this reservoir's own record

29.13 Mm³
Stored, November 2024
84th
Percentile among 38 Novs on record
+61.5%
Against the Nov 1991–2020 average
-36.4%
Change over the 12 months to 2024-11

Storage in November 2024 was higher than most Novs on record, ranked against 38 other Novs held for this reservoir.

Storage, 1987–2024

Monthly mean storage
447 monthly values, 1987 to 2024
Monthly mean storageMonthly mean storage: Big Sandy Reservoir Near Farson, WY in Mm³, from 1987.3333333333333 to 2024.8333333333333.020406080Mm³1987.333333333333319921996.66666666666672001.52006.16666666666672010.83333333333332015.66666666666672020.3333333333333Year

Monthly means of the publisher's daily record. Volume, not percentage of capacity: without a capacity whose definition is stated, fullness cannot be computed.

View the data behind this chart
Underlying data
PeriodBig Sandy Reservoir Near Farson, WY (Mm³)
May 198747.4
June 198745.3
July 198742.0
August 198733.0
September 198726.8
October 198727.2
November 198728.4
December 198729.1
January 198829.2
February 198829.5
March 198830.8
April 198833.5
May 198836.2
June 198831.8
July 198820.7
August 19887.27
September 19881.61
October 19881.79
November 19882.42
December 19882.81
January 19892.87
February 19892.91
March 19894.01
April 19897.40
May 198915.1
June 198919.8
July 198917.1
August 198911.0
September 19897.38
October 19898.82
November 198910.1
December 198910.9
January 199011.4
February 199011.9
March 199013.1
April 199016.8
May 199023.1
June 199031.9
July 199032.2
August 199023.1
September 199015.1
October 199015.3
November 199017.0
December 199018.2
January 199118.5
February 199119.1
March 199120.4
April 199123.7
May 199130.1
June 199145.5
July 199135.9
August 199125.6
September 199118.7
October 199119.5
November 199120.7
December 199121.9
January 199222.8
February 199223.3
March 199225.9
April 199228.7
May 199232.9
June 199226.7
July 199221.9
August 199211.3
September 19922.68
October 19923.33
November 19924.53
December 19925.47
January 19936.58
February 19937.53
March 19938.73
April 199311.8
May 199317.8
June 199336.7
July 199337.9
August 199336.5
September 199329.1
October 199329.1
November 199330.3
December 199331.1
January 199431.6
February 199432.2
March 199433.7
April 199436.7
May 199443.6
June 199437.6
July 199422.9
August 19948.50
September 19942.53
October 19943.25
November 19944.95
December 19945.98
January 19956.93
February 19958.10
March 199511.9
April 199517.0
May 199522.8
June 199544.6
July 199548.6
August 199539.1
September 199529.7
October 199530.6
November 199532.2
December 199533.7
January 199634.7
February 199635.6
March 199637.2
April 199640.6
May 199640.7
June 199645.6
July 199643.6
August 199629.4
September 199614.4
October 199614.2
November 199615.8
December 199617.4
January 199718.8
February 199720.3
March 199725.5
April 199735.7
May 199743.7
June 199749.4
July 199743.9
August 199736.7
September 199725.1
October 199724.8
November 199726.6
December 199727.2
January 199828.1
February 199829.1
March 199830.3
April 199833.6
May 199839.2
June 199844.2
July 199847.0
August 199841.4
September 199832.5
October 199833.1
November 199835.8
December 199837.3
January 199937.9
February 199939.3
March 199943.0
April 199947.5
May 199948.3
June 199949.8
July 199945.5
August 199931.7
September 199920.6
October 199921.0
November 199922.1
December 199923.0
February 200024.5
March 200025.9
April 200028.7
May 200034.9
July 200032.3
August 200011.9
September 20001.22
October 20001.06
November 20003.69
December 20005.14
January 20016.00
February 20016.70
March 20018.19
April 200111.8
May 200120.7
June 200123.2
July 200111.4
August 20010.915
September 20011.09
October 20011.61
November 20012.70
December 20013.53
January 20024.09
February 20024.43
March 20025.09
April 20027.99
May 200212.2
June 200222.9
July 200215.4
August 20023.05
September 20021.98
October 20023.05
November 20023.99
December 20024.84
January 20035.40
February 20036.14
March 20037.60
April 200310.5
May 200315.0
June 200324.9
July 200319.3
August 20036.09
September 20033.98
October 20034.80
November 20035.42
December 20036.13
January 20046.75
February 20047.30
March 20048.48
April 200413.1
May 200421.5
June 200428.1
July 200433.6
August 200424.3
September 200417.9
October 200420.6
November 200423.9
December 200425.2
January 200526.4
February 200527.6
March 200530.3
April 200534.8
May 200540.9
June 200548.3
July 200546.2
August 200539.4
September 200530.3
October 200528.8
November 200529.8
December 200530.5
January 200631.4
February 200632.5
March 200633.5
April 200635.9
May 200642.7
June 200645.2
July 200635.9
August 200621.0
September 200611.5
October 200612.6
November 200614.6
December 200615.5
January 200716.1
February 200716.7
March 200718.4
April 200721.9
May 200731.6
June 200733.9
July 200721.2
August 20079.83
September 20075.28
October 20077.54
November 200710.1
December 200711.1
January 200811.8
February 200812.5
March 200813.4
April 200815.3
May 200822.4
June 200835.4
July 200835.6
August 200820.6
September 200810.6
October 200811.3
November 200812.8
December 200813.6
January 200913.9
February 200914.6
March 200915.5
April 200918.1
May 200923.7
June 200943.1
July 200946.1
August 200934.5
September 200923.0
October 200920.8
November 200922.5
December 200922.9
January 201022.8
February 201023.0
March 201024.6
April 201027.1
May 201031.3
June 201041.5
July 201042.3
August 201028.2
September 201018.6
October 201017.8
November 201018.9
December 201020.0
January 201121.3
February 201122.2
March 201123.1
April 201125.8
May 201129.6
June 201141.4
July 201148.7
August 201137.1
September 201124.5
October 201124.1
November 201125.6
December 201126.5
January 201226.9
February 201227.5
March 201228.9
April 201233.4
May 201243.1
June 201243.0
July 201230.8
August 201215.7
September 20125.92
October 20125.73
November 20126.97
December 20128.22
January 20138.70
February 20139.31
March 201310.4
April 201313.0
May 201319.5
June 201326.6
July 201316.1
August 20134.82
September 20134.27
October 20137.34
November 20139.63
December 201310.5
January 201411.1
February 201411.6
March 201413.0
April 201415.8
May 201422.0
June 201435.9
July 201433.8
August 201423.6
November 201423.1
December 201424.6
January 201526.0
February 201527.1
March 201528.7
April 201531.4
May 201539.7
June 201547.4
July 201541.8
August 201531.7
September 201522.2
October 201521.8
November 201522.7
December 201523.4
January 201623.9
February 201624.5
March 201625.9
April 201628.7
May 201637.2
June 201646.8
July 201640.8
August 201626.3
September 201617.3
October 201619.5
November 201624.3
December 201626.3
January 201728.0
February 201729.8
March 201734.0
April 201733.9
May 201742.2
June 201748.4
July 201745.7
August 201737.8
September 201730.3
October 201732.7
November 201734.6
December 201736.2
January 201837.4
February 201838.5
March 201839.8
April 201842.5
May 201846.6
June 201846.6
July 201841.1
August 201827.8
September 201817.0
October 201816.4
November 201817.4
December 201818.3
January 201919.1
February 201919.9
March 201921.0
April 201924.2
May 201931.8
June 201942.0
July 201943.7
August 201932.6
September 201922.7
October 201924.5
November 201926.0
December 201926.9
January 202027.5
February 202028.2
March 202029.2
April 202031.6
May 202037.2
June 202040.9
July 202034.9
August 202020.8
September 202010.1
October 20208.97
November 20209.58
December 20209.85
January 20219.79
February 20219.84
March 202110.6
April 202113.0
May 202118.4
June 202124.5
July 202116.2
August 20212.55
September 20211.98
October 20213.61
November 20215.94
December 20217.17
January 20227.79
February 20228.18
March 20229.00
April 202211.8
May 202216.1
June 202228.0
July 202226.7
August 202214.0
September 20224.13
October 20224.88
November 20226.49
December 20227.56
January 20238.67
February 20239.82
March 202310.9
April 202312.8
May 202327.5
June 202357.8
July 202360.1
August 202351.3
September 202344.1
October 202344.1
November 202345.8
December 202346.9
January 202447.8
February 202448.9
March 202450.1
April 202453.3
May 202459.9
June 202462.2
July 202453.6
August 202440.4
September 202430.2
October 202428.4
November 202429.1

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: 20.0 Mm³1991–2020 average 2: 21.0 Mm³1991–2020 average 3: 22.7 Mm³1991–2020 average 4: 26.0 Mm³1991–2020 average 5: 32.2 Mm³1991–2020 average 6: 39.5 Mm³1991–2020 average 7: 35.5 Mm³1991–2020 average 8: 24.0 Mm³1991–2020 average 9: 15.7 Mm³1991–2020 average 10: 16.2 Mm³1991–2020 average 11: 18.0 Mm³1991–2020 average 12: 19.1 Mm³Most recent 12 months 1: 47.8 Mm³Most recent 12 months 2: 48.9 Mm³Most recent 12 months 3: 50.1 Mm³Most recent 12 months 4: 53.3 Mm³Most recent 12 months 5: 59.9 Mm³Most recent 12 months 6: 62.2 Mm³Most recent 12 months 7: 53.6 Mm³Most recent 12 months 8: 40.4 Mm³Most recent 12 months 9: 30.2 Mm³Most recent 12 months 10: 28.4 Mm³Most recent 12 months 11: 29.1 Mm³Most recent 12 months 12: 46.9 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)
Jan20.047.8
Feb21.048.9
Mar22.750.1
Apr26.053.3
May32.259.9
Jun39.562.2
Jul35.553.6
Aug24.040.4
Sep15.730.2
Oct16.228.4
Nov18.029.1
Dec19.146.9

Rate and persistence

-1.39 Mm³
Mean drawdown per month over 12 months
1 of 24
Months in the last two years 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

Big Sandy Reservoir Near Farson, WY
Gauge location
Big Sandy Reservoir Near Farson, WYBig Sandy Reservoir Near Farson, WY — 29.13 Mm³Big Sandy Reservoir Near Farson, WY — 29.13 Mm³

Where this comes from

447 monthly observations 1987–2024 Mm³
Spatially aggregatedHigh confidenceNovember 2024

Source: USGS — National Water Information System, 09213700. 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 25 August 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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