HydrionisGlobal Water Intelligence
Monitored reservoir

Silver Jack Reservoir Near Cimarron, CO

United States Geological Survey reservoir gauge 09125800 in CO, with published storage from 1987.

Storage record09125800

Storage now, against this reservoir's own record

2.03 Mm³
Stored, August 2026
0th
Percentile among 20 Augs on record
-76.2%
Change over the 12 months to 2026-08

Storage in August 2026 was lower than almost every other Aug on record, ranked against 20 other Augs held for this reservoir. It is the lowest in the held record for this month.

Storage, 1987–2026

Monthly mean storage
231 monthly values, 1987 to 2026
Monthly mean storageMonthly mean storage: Silver Jack Reservoir Near Cimarron, CO in Mm³, from 1987.8333333333333 to 2026.5833333333333.05101520Mm³1987.83333333333331991.252005.91666666666672009.33333333333332011.752019.16666666666672021.58333333333332024.3333333333333Year

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
PeriodSilver Jack Reservoir Near Cimarron, CO (Mm³)
November 19873.80
December 19873.69
January 19883.52
February 19883.29
March 19883.12
April 19884.03
May 19888.76
June 198816.0
July 198815.1
August 198810.2
September 19886.32
October 19885.69
November 19885.37
December 19885.91
January 19896.37
February 19896.70
March 19897.21
April 19899.46
May 198914.6
June 198916.0
July 198913.8
August 19899.65
September 19895.80
October 19904.43
November 19905.44
December 19906.57
January 19917.41
February 19918.05
March 19918.69
April 19919.88
May 199114.1
June 199116.4
August 199111.7
September 19916.93
October 19914.88
January 19926.07
February 19926.49
March 19926.99
April 19928.59
May 199215.5
June 199216.3
July 199215.9
August 199213.3
September 19928.72
October 19927.03
November 19926.62
December 19927.35
January 19937.92
February 19938.42
March 19938.93
April 19939.79
May 199312.9
June 199316.4
July 199315.8
August 199311.7
September 19937.47
October 20055.17
November 20056.42
December 20057.37
January 20068.20
February 20068.78
April 200611.5
May 200616.2
June 200616.1
July 200615.0
August 200610.2
September 20066.33
October 20067.48
November 20068.90
December 200610.2
January 200711.2
February 200711.9
March 200712.9
April 200715.1
May 200716.2
June 200716.2
July 200714.3
August 200710.3
September 20077.14
October 20077.25
November 20077.73
November 20082.77
December 20082.69
January 20093.39
February 20093.93
March 20094.60
April 20096.28
May 200914.9
June 200916.2
July 200914.7
August 20099.22
September 20094.21
October 20093.03
November 20093.10
December 20093.40
January 20103.76
February 20104.01
March 20104.21
April 20105.93
May 201012.7
June 201016.2
July 201013.4
August 20109.38
September 20104.17
October 20102.18
November 20102.03
December 20102.74
January 20113.37
February 20113.79
March 20114.18
April 20115.48
May 20119.71
June 201116.4
July 201116.2
August 201113.7
September 20117.78
October 20115.71
November 20114.75
December 20115.02
January 20125.29
February 20125.48
March 20125.92
April 20129.41
May 201215.3
June 201214.9
July 201210.1
August 20125.38
September 20122.55
October 20174.41
November 20173.84
December 20173.53
January 20183.59
February 20183.71
March 20183.86
April 20185.08
May 201813.0
June 201815.6
July 201811.7
August 20185.69
September 20181.65
October 20180.907
November 20181.10
December 20181.61
January 20192.04
February 20192.37
March 20192.50
April 20192.92
May 20193.33
June 201912.7
July 201916.3
August 201914.0
September 20196.45
October 20192.67
November 20191.75
December 20191.83
January 20201.79
February 20201.77
March 20201.95
April 20202.65
May 20208.02
June 202015.8
July 202014.0
August 20208.20
September 20202.63
October 20200.836
November 20200.922
December 20201.08
January 20211.11
February 20211.16
March 20211.38
April 20212.61
May 20216.64
June 202115.0
July 202114.0
August 202110.5
September 20213.82
October 20211.61
November 20212.08
December 20212.10
May 202213.1
June 202216.1
July 202213.3
August 20229.01
September 20223.57
October 20222.20
November 20222.09
December 20222.21
January 20232.36
February 20232.35
March 20232.27
April 20232.64
May 20235.95
June 202315.3
July 202315.7
August 202310.6
September 20232.99
October 20231.17
November 20231.08
December 20230.835
January 20241.15
February 20241.72
March 20242.25
April 20243.67
May 20248.09
June 202415.7
July 202415.1
August 202410.3
September 20244.63
October 20241.31
November 20241.23
December 20241.48
January 20251.62
February 20251.75
March 20251.93
April 20253.67
May 20259.93
June 202516.2
July 202514.8
August 20258.56
September 20251.67
October 20251.31
November 20252.01
December 20252.06
January 20262.03
February 20262.05
March 20262.92
April 20266.58
May 20268.83
June 20268.05
July 20264.30
August 20262.03

Rate and persistence

-0.54 Mm³
Mean drawdown per month over 12 months
10 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

Silver Jack Reservoir Near Cimarron, CO
Gauge location
Silver Jack Reservoir Near Cimarron, COSilver Jack Reservoir Near Cimarron, CO — 2.03 Mm³Silver Jack Reservoir Near Cimarron, CO — 2.03 Mm³

Where this comes from

231 monthly observations 1987–2026 Mm³
Spatially aggregatedHigh confidenceAugust 2026

Source: USGS — National Water Information System, 09125800. 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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