HydrionisGlobal Water Intelligence
Monitored reservoir

Mud Mountain Lake Near Buckley, WA

United States Geological Survey reservoir gauge 12098000 in WA, with published storage from 1982.

Storage record12098000

Storage now, against this reservoir's own record

0.03 Mm³
Stored, August 2026
33rd
Percentile among 44 Augs on record
-96.3%
Against the Aug 1991–2020 average

Storage in August 2026 was around the middle of the Aug record, ranked against 44 other Augs held for this reservoir.

Storage, 1982–2026

Monthly mean storage
518 monthly values, 1982 to 2026
Monthly mean storageMonthly mean storage: Mud Mountain Lake Near Buckley, WA in Mm³, from 1982.75 to 2026.5833333333333.010203040Mm³1982.751988.16666666666671993.83333333333331999.52004.91666666666672010.33333333333332015.752021.1666666666667Year

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
PeriodMud Mountain Lake Near Buckley, WA (Mm³)
October 19822.43
November 19821.00
December 19820.801
January 19831.19
February 19830.315
March 19830.824
April 19830.446
May 19830.513
June 19831.58
July 19830.454
August 19830.052
September 19830.124
October 19832.67
November 19830.946
December 19830.066
January 19843.18
February 19841.96
March 19840.573
April 19840.862
May 19841.39
June 19848.16
July 19843.03
August 19842.54
September 19842.40
October 19841.83
November 19841.76
December 19841.73
January 19851.62
February 19851.50
March 19851.45
April 19852.01
May 19852.63
June 19852.82
July 19853.16
August 19853.63
September 19850.121
October 19851.01
November 19850.690
December 19850.074
January 19860.273
February 19860.963
March 19861.41
April 19860.054
May 19860.667
June 19869.39
July 19862.47
August 19862.44
September 19862.31
October 19861.98
November 19861.96
December 19861.84
January 19870.154
February 19870.856
March 19870.733
April 198713.5
May 19872.01
June 19870.208
July 19870.175
August 19870.357
September 19870.277
October 19870
November 19870
December 19870.846
January 19880.068
February 19880.155
March 19880.592
April 19881.94
May 19882.17
June 19880.299
July 19880.082
August 19881.52
September 19883.06
October 19881.53
November 19880.532
December 19880.152
January 19890.266
February 19890.126
March 19890.373
April 19891.77
May 19891.03
June 19891.18
July 19890.087
August 19890.080
September 19890.078
October 19890.042
November 19890.391
December 19890.631
January 19903.25
February 19900.732
March 19900.928
April 19901.39
May 19901.14
June 199024.3
July 19902.14
August 19900.047
September 19900.043
October 19900.145
November 19908.07
December 19900.827
January 19910.909
February 19914.84
March 19910.689
April 19910.672
May 19910.124
June 19910.974
July 19910.133
August 19910.051
September 19910.067
October 19910.061
November 19910.647
December 19911.54
January 19920.538
February 19920.409
March 19920.088
April 19920.101
May 19920.091
June 19920.086
July 19920.083
August 19920.081
September 19920.081
October 19920.072
December 19920.057
March 19930.074
April 19930.074
May 19930.120
June 19930.102
July 19930.117
August 19930.111
September 19930.102
October 19930.104
November 19930.086
December 19930.064
January 19940.073
February 19940.060
March 19940.067
April 19940.077
May 19940.078
June 19940.068
July 19940.060
August 19940.053
September 19940.051
November 19941.10
December 19949.84
January 19950.086
February 19957.54
March 19955.34
April 19950.134
May 19950.260
June 19950.256
July 19950.197
August 19950.147
September 19950.202
October 19951.35
November 19958.43
December 199515.4
January 19964.05
February 199636.1
March 199620.6
April 19961.20
May 19960.733
June 19960.913
July 19960.297
August 19960.584
September 19960.132
October 19960.161
November 19961.11
December 19964.78
January 19979.21
March 199715.8
April 199710.9
May 19972.40
June 19970.439
July 19970.116
August 19970
September 19970.140
October 19970.501
November 19971.41
December 19970.183
January 19980
March 19988.06
April 19980.836
May 19980.402
June 19980.333
July 19980.197
August 19980.149
September 19980.131
October 19980.149
November 19980.238
December 19982.46
January 19991.70
February 19990.027
March 19990.017
April 19990
May 19990.090
June 19990.532
July 19990.108
August 19990.010
September 19990
October 19990
November 19994.65
December 19991.11
January 20000
February 20000.0068
March 20000
April 20000.026
May 20000.158
June 20000.961
July 20000
August 20000
September 20000
October 20000.017
November 20000
December 20000.099
January 20010.118
February 20010.027
March 20010.292
April 20010.175
May 20010.257
June 20010.234
July 20010.169
August 200118.0
September 20010.732
October 20010.130
November 20010.297
December 20010.196
January 20020.875
February 20020.043
March 20020.035
April 20022.36
May 20020.052
June 20020.148
July 20020.0082
August 20020
September 20020
October 20020
November 20020
December 20020
January 20030.163
February 20038.48
March 20030.169
April 20030.807
May 20030.012
June 20030.021
July 20030
August 20031.35
September 20030
October 20030.012
November 20030.031
December 20030
January 20040.909
February 20040.855
March 20040.0071
April 20040
May 20040.029
June 20040.027
July 20040.0059
August 20040.145
September 20040.155
October 20040.142
November 20040.010
December 20040.157
January 20053.78
February 20050
March 20050
April 20050
May 20050
June 20050
July 20050
August 20050
September 20050.0097
October 20050.0038
November 20050.0040
December 20051.58
January 20063.74
February 20060.152
March 20060
April 20060
May 20060.077
June 20060.060
July 20060
August 20060.195
September 20060.123
October 20060.115
November 200626.2
December 20068.32
January 20071.92
February 20070.052
March 20071.61
April 20070.117
May 20070.895
June 20070.187
July 20070.104
August 20070.142
September 20070.128
October 20070.141
November 20070.076
December 20070.513
January 20080.038
February 20080.589
March 20080.366
April 20080.413
May 20086.72
June 20080.405
July 20080.045
August 20080.0087
September 20080.254
October 20080.121
November 200812.6
December 20081.61
January 200923.4
February 20091.70
March 20090.973
April 20090.108
May 20090.219
June 20090.153
July 20090.085
August 20090.043
September 20090.035
October 20090.037
November 20090.093
December 20090.050
January 20100.058
February 20100.145
March 20100.137
April 20100.168
May 20100.223
June 20100.190
July 20100.086
August 20100.039
September 20100.139
October 20100.141
November 20100.205
December 20101.03
January 201112.9
February 20110.282
March 20112.58
April 20117.63
May 20113.97
June 20110.362
July 20117.77
August 20111.33
September 20110.148
October 20110.032
November 20110.028
December 20110.234
January 20120.286
February 20121.94
March 20120.010
April 20120.069
May 20120.081
June 20120.034
July 20128.01
August 20120.0059
September 20120.0035
October 20120.013
November 20120.036
December 20120.0082
January 20130.033
February 20130.040
March 20130.049
April 20130.074
May 20130.026
June 20130.019
July 20130.0088
August 20130.0051
September 20130.0078
October 20130.020
November 20130.041
December 20130.768
January 20140.012
February 20140.0095
March 20144.13
April 20140.046
May 20140.065
June 20140.060
July 20141.74
August 20140.0059
September 20140.0035
October 20140.0063
November 20142.18
December 20140.746
January 20152.36
February 20150.868
March 20151.54
April 20150.039
May 20150.122
June 20157.64
July 20151.24
August 20151.19
September 20150.027
October 20150.032
November 20155.41
December 20158.32
January 20160.220
February 201621.4
March 20160.080
April 20160.064
May 20160.060
June 20160.055
July 20160.023
August 20160.0043
September 20160.0028
October 20160.043
November 20160.050
December 20160.014
January 20170.063
February 20172.50
March 20172.59
April 20170.057
May 20170.117
June 20170.064
July 20170.026
August 20170.039
September 20170.031
October 20173.51
November 20173.60
December 20170.471
January 20180.183
February 20186.12
March 20180.040
April 20180.066
May 20180.081
June 20180.047
July 20180.038
August 20180.032
September 20180.025
October 20180.027
November 20180.032
December 20180.039
January 20190.036
February 20190.0050
March 20190.035
April 20190.061
May 20190.059
June 20190.048
July 20190.0071
August 20190.0044
September 20190.0032
October 20190.031
November 20190.029
December 20190.554
January 20200.685
February 202027.5
March 20200.035
April 20200.049
May 20200.155
June 20200.068
July 20200.019
August 20200.0058
September 20200.0054
October 20200.0071
November 20200.112
December 20200.113
January 20210.785
February 20210.025
March 20210.042
April 20210.053
May 20210.060
July 20210.0079
August 20210.0038
September 20210.0026
October 20210.0045
November 20214.00
December 20210.031
January 20221.91
February 20220.0094
March 20223.39
April 20220.044
May 20220.099
June 20221.83
July 20220.055
August 20220.0043
September 20220.0022
October 20220.0013
November 20221.09
December 20220.525
January 20230.026
February 20230.0042
March 20230.028
April 20230.091
May 20230.493
June 20230.035
July 20230.025
August 20230.030
September 20230.027
October 20230.0100
November 20230.0049
December 20231.23
January 20240.393
February 20240.210
March 20240.039
April 20240.041
May 20240.050
June 20240.049
July 20240.022
August 20240.032
September 20240.027
October 20240.020
November 20240.033
December 20240.047
January 20250.041
February 20250.748
March 20255.52
April 20252.11
May 20250.049
June 20250.047
July 20250.021
August 20250.031
September 20250.027
October 20250.026
November 20250.164
December 202539.9
January 20268.59
April 20260.907
May 20260.050
June 20260.017
July 20260.033
August 20260.029

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 12.010203040Mm³123456789101112Month1991–2020 average 1: 2.36 Mm³1991–2020 average 2: 4.51 Mm³1991–2020 average 3: 2.18 Mm³1991–2020 average 4: 0.880 Mm³1991–2020 average 5: 0.590 Mm³1991–2020 average 6: 0.480 Mm³1991–2020 average 7: 0.690 Mm³1991–2020 average 8: 0.790 Mm³1991–2020 average 9: 0.090 Mm³1991–2020 average 10: 0.240 Mm³1991–2020 average 11: 2.37 Mm³1991–2020 average 12: 2.01 Mm³Most recent 12 months 1: 8.59 Mm³Most recent 12 months 4: 0.907 Mm³Most recent 12 months 5: 0.050 Mm³Most recent 12 months 6: 0.017 Mm³Most recent 12 months 7: 0.033 Mm³Most recent 12 months 8: 0.029 Mm³Most recent 12 months 9: 0.027 Mm³Most recent 12 months 10: 0.026 Mm³Most recent 12 months 11: 0.164 Mm³Most recent 12 months 12: 39.9 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)
Jan2.368.59
Feb4.51—
Mar2.18—
Apr0.8800.907
May0.5900.050
Jun0.4800.017
Jul0.6900.033
Aug0.7900.029
Sep0.0900.027
Oct0.2400.026
Nov2.370.164
Dec2.0139.9

Rate and persistence

6 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

Mud Mountain Lake Near Buckley, WA
Gauge location
Mud Mountain Lake Near Buckley, WAMud Mountain Lake Near Buckley, WA — 0.03 Mm³Mud Mountain Lake Near Buckley, WA — 0.03 Mm³

Where this comes from

518 monthly observations 1982–2026 Mm³
Spatially aggregatedHigh confidenceAugust 2026

Source: USGS — National Water Information System, 12098000. 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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