HydrionisGlobal Water Intelligence
Monitored reservoir

Millerton Lk A Friant CA

United States Geological Survey reservoir gauge 11250100 in CA, with published storage from 1941.

Storage record11250100

Storage now, against this reservoir's own record

356.57 Mm³
Stored, September 2022
84th
Percentile among 80 Seps on record
+12.7%
Against the Sep 1991–2020 average
+9.8%
Change over the 12 months to 2022-09

Storage in September 2022 was higher than most Seps on record, ranked against 80 other Seps held for this reservoir.

Storage, 1941–2022

Monthly mean storage
968 monthly values, 1941 to 2022
Monthly mean storageMonthly mean storage: Millerton Lk A Friant CA in Mm³, from 1941.75 to 2022.6666666666667.0200400600800Mm³1941.751952.16666666666671962.251972.33333333333331982.41666666666671992.52002.58333333333332012.6666666666667Year

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
PeriodMillerton Lk A Friant CA (Mm³)
October 19412.62
November 194123.0
December 194127.8
January 194229.0
February 194229.3
March 194229.0
April 194233.5
May 194237.9
June 194240.5
July 194233.0
August 194227.7
January 194333.1
February 194329.4
March 194333.8
April 194334.6
May 194338.0
June 194334.1
July 194329.0
August 194327.2
September 194326.3
October 194325.9
November 194327.2
December 194326.8
January 194427.3
February 194430.3
March 194484.1
April 194499.6
May 1944185
June 1944333
July 1944357
August 1944267
September 1944186
October 1944136
November 1944160
December 1944232
January 1945287
February 1945394
March 1945384
April 1945405
May 1945446
June 1945509
July 1945530
August 1945439
September 1945337
October 1945290
November 1945306
December 1945318
January 1946357
February 1946332
March 1946337
April 1946399
May 1946525
June 1946538
July 1946491
August 1946375
September 1946274
October 1946210
November 1946199
December 1946294
January 1947372
February 1947409
March 1947435
April 1947423
May 1947463
June 1947475
July 1947369
August 1947237
September 1947151
October 1947113
November 1947126
December 1947148
January 1948166
February 1948173
March 1948166
April 1948202
May 1948315
June 1948520
July 1948526
August 1948370
September 1948235
October 1948163
November 1948172
December 1948188
January 1949210
February 1949228
March 1949255
April 1949299
May 1949401
June 1949527
July 1949416
August 1949239
September 1949130
October 194970.9
November 194954.8
December 194972.5
January 1950111
February 1950211
March 1950253
April 1950295
May 1950406
June 1950513
July 1950382
August 1950209
September 1950115
October 195088.2
November 1950182
December 1950478
January 1951502
February 1951433
March 1951451
April 1951442
May 1951495
June 1951550
July 1951450
August 1951261
September 1951179
October 1951180
November 1951178
December 1951228
January 1952380
February 1952441
March 1952360
April 1952247
May 1952239
June 1952468
July 1952528
August 1952428
September 1952256
October 1952210
November 1952185
December 1952246
January 1953362
February 1953444
March 1953420
April 1953384
May 1953469
June 1953555
July 1953555
August 1953404
September 1953240
October 1953179
November 1953178
December 1953212
January 1954240
February 1954277
March 1954353
April 1954472
May 1954615
June 1954617
July 1954492
August 1954305
September 1954190
October 1954181
November 1954200
December 1954247
January 1955323
February 1955387
March 1955411
April 1955372
May 1955486
June 1955611
July 1955528
August 1955338
September 1955195
October 1955168
November 1955180
December 1955314
January 1956540
February 1956437
March 1956330
April 1956253
May 1956409
June 1956510
July 1956560
August 1956467
September 1956284
October 1956231
November 1956235
December 1956294
January 1957340
February 1957384
March 1957430
April 1957400
May 1957527
June 1957633
July 1957559
August 1957383
September 1957241
October 1957207
November 1957251
December 1957330
January 1958420
February 1958490
March 1958567
April 1958560
May 1958530
June 1958611
July 1958612
August 1958414
September 1958234
October 1958192
November 1958238
December 1958318
January 1959388
February 1959447
March 1959460
April 1959436
May 1959538
June 1959541
July 1959386
August 1959234
September 1959186
October 1959186
November 1959167
December 1959179
January 1960200
February 1960251
March 1960288
April 1960297
May 1960377
June 1960379
July 1960258
August 1960198
September 1960212
October 1960227
November 1960238
December 1960274
January 1961299
February 1961306
March 1961275
April 1961305
May 1961386
June 1961439
July 1961340
August 1961230
September 1961192
October 1961186
November 1961177
December 1961206
January 1962235
February 1962343
March 1962481
April 1962377
May 1962393
June 1962516
July 1962475
August 1962305
September 1962179
October 1962187
November 1962213
December 1962252
January 1963290
February 1963452
March 1963529
April 1963612
May 1963615
June 1963635
July 1963597
August 1963434
September 1963273
October 1963208
November 1963235
December 1963356
January 1964435
February 1964437
March 1964351
April 1964386
May 1964461
June 1964497
July 1964377
August 1964208
September 1964189
October 1964201
November 1964223
December 1964288
January 1965493
February 1965471
March 1965355
April 1965412
May 1965473
June 1965500
July 1965468
August 1965332
September 1965230
October 1965195
November 1965238
December 1965369
January 1966499
February 1966504
March 1966457
April 1966445
May 1966550
June 1966557
July 1966407
August 1966268
September 1966205
October 1966202
November 1966223
December 1966353
January 1967480
February 1967497
March 1967561
April 1967626
May 1967430
June 1967367
July 1967616
August 1967544
September 1967351
October 1967234
November 1967219
December 1967288
January 1968346
February 1968319
March 1968276
April 1968322
May 1968351
June 1968321
July 1968246
August 1968204
September 1968191
October 1968202
November 1968229
December 1968278
January 1969415
February 1969461
March 1969323
April 1969169
May 1969282
June 1969536
July 1969611
August 1969528
September 1969370
October 1969311
November 1969326
December 1969371
January 1970467
February 1970523
March 1970531
April 1970545
May 1970565
June 1970539
July 1970442
August 1970275
September 1970206
October 1970196
November 1970214
December 1970307
January 1971448
February 1971491
March 1971443
April 1971465
May 1971561
June 1971608
July 1971485
August 1971272
September 1971183
October 1971187
November 1971207
December 1971258
January 1972353
February 1972410
March 1972372
April 1972392
May 1972427
June 1972398
July 1972283
August 1972202
September 1972190
October 1972201
November 1972270
December 1972352
January 1973446
February 1973531
March 1973571
April 1973526
May 1973467
June 1973630
July 1973536
August 1973342
September 1973201
October 1973183
November 1973233
December 1973356
January 1974513
February 1974515
March 1974547
April 1974579
May 1974523
June 1974608
July 1974492
August 1974272
September 1974182
October 1974174
November 1974212
December 1974290
January 1975356
February 1975380
March 1975374
April 1975448
May 1975399
June 1975556
July 1975458
August 1975262
September 1975195
October 1975198
November 1975268
December 1975362
January 1976425
February 1976435
March 1976434
April 1976455
May 1976460
June 1976440
July 1976337
August 1976251
September 1976246
October 1976285
November 1976281
December 1976297
January 1977308
February 1977299
March 1977283
April 1977275
May 1977265
June 1977275
July 1977271
August 1977237
September 1977237
October 1977229
November 1977218
December 1977238
January 1978368
February 1978516
March 1978550
April 1978409
May 1978212
June 1978383
July 1978554
August 1978536
September 1978466
October 1978389
November 1978297
December 1978379
January 1979499
February 1979542
March 1979566
April 1979581
May 1979556
June 1979611
July 1979460
August 1979278
September 1979209
October 1979208
November 1979233
December 1979267
January 1980416
February 1980512
March 1980445
April 1980349
May 1980396
June 1980510
July 1980640
August 1980536
September 1980382
October 1980284
November 1980261
December 1980303
January 1981332
February 1981369
March 1981382
April 1981466
May 1981526
June 1981506
July 1981371
August 1981242
September 1981209
October 1981216
November 1981244
December 1981335
January 1982482
February 1982481
March 1982535
April 1982561
May 1982478
June 1982611
July 1982636
August 1982528
September 1982439
October 1982455
November 1982429
December 1982432
January 1983454
February 1983505
March 1983532
April 1983333
May 1983193
June 1983490
July 1983613
August 1983627
September 1983523
October 1983403
November 1983379
December 1983442
January 1984501
February 1984501
March 1984474
April 1984548
May 1984588
June 1984582
July 1984425
August 1984280
September 1984224
October 1984196
November 1984197
December 1984263
January 1985356
February 1985401
March 1985332
April 1985395
May 1985501
June 1985475
July 1985346
August 1985226
September 1985207
October 1985203
November 1985263
December 1985372
January 1986478
February 1986561
March 1986550
April 1986329
May 1986311
June 1986585
July 1986590
August 1986426
September 1986257
October 1986177
November 1986177
December 1986188
January 1987209
February 1987204
March 1987229
April 1987278
May 1987357
June 1987385
July 1987299
August 1987235
September 1987219
October 1987189
November 1987206
December 1987241
January 1988303
February 1988304
March 1988289
April 1988349
May 1988425
June 1988404
July 1988286
August 1988191
September 1988180
October 1988176
November 1988182
December 1988214
January 1989252
February 1989280
March 1989329
April 1989405
May 1989461
June 1989432
July 1989284
August 1989180
September 1989173
October 1989171
November 1989180
December 1989195
January 1990212
February 1990239
March 1990282
April 1990339
May 1990408
June 1990414
July 1990358
August 1990272
September 1990234
October 1990211
November 1990195
December 1990207
January 1991221
February 1991222
March 1991286
April 1991425
May 1991474
June 1991499
July 1991421
August 1991289
September 1991227
October 1991207
November 1991212
December 1991236
January 1992271
February 1992319
March 1992407
April 1992507
May 1992558
June 1992431
July 1992290
August 1992227
September 1992211
October 1992194
November 1992201
December 1992208
January 1993321
February 1993493
March 1993530
April 1993511
May 1993486
June 1993593
July 1993589
August 1993368
September 1993223
October 1993196
November 1993207
December 1993253
January 1994298
February 1994330
March 1994371
April 1994427
May 1994511
June 1994506
July 1994373
August 1994266
September 1994220
October 1994231
November 1994246
December 1994246
January 1995376
February 1995541
March 1995582
April 1995489
May 1995388
June 1995453
July 1995634
August 1995586
September 1995442
October 1995371
November 1995331
December 1995351
January 1996410
February 1996512
March 1996590
April 1996603
May 1996567
June 1996620
July 1996524
August 1996360
September 1996298
October 1996263
November 1996285
December 1996462
January 1997547
February 1997451
March 1997329
April 1997355
May 1997509
June 1997628
July 1997510
August 1997347
September 1997296
October 1997228
November 1997209
December 1997246
January 1998325
February 1998444
March 1998458
April 1998511
May 1998427
June 1998512
July 1998631
August 1998592
September 1998541
October 1998514
November 1998500
December 1998511
January 1999534
February 1999555
March 1999547
April 1999610
May 1999637
June 1999641
July 1999515
August 1999329
September 1999293
October 1999268
November 1999278
December 1999319
January 2000355
February 2000439
March 2000591
April 2000584
May 2000613
June 2000637
July 2000538
August 2000394
September 2000289
October 2000266
November 2000304
December 2000333
January 2001345
February 2001364
March 2001420
April 2001511
May 2001608
June 2001558
July 2001387
August 2001269
September 2001228
October 2001220
November 2001206
December 2001236
January 2002312
February 2002387
March 2002443
April 2002533
May 2002613
June 2002606
July 2002449
August 2002299
September 2002278
October 2002275
November 2002290
December 2002347
January 2003414
February 2003474
March 2003543
April 2003615
May 2003606
June 2003627
July 2003509
August 2003360
September 2003280
October 2003256
November 2003266
December 2003291
January 2004357
February 2004423
March 2004494
April 2004564
May 2004590
June 2004505
July 2004370
August 2004262
September 2004232
October 2004227
November 2004297
December 2004384
January 2005494
February 2005484
March 2005548
April 2005566
May 2005521
June 2005603
July 2005623
August 2005452
September 2005326
October 2005284
November 2005303
December 2005351
January 2006469
February 2006503
March 2006551
April 2006533
May 2006479
June 2006633
July 2006622
August 2006487
September 2006348
October 2006295
November 2006305
December 2006308
January 2007304
February 2007270
March 2007287
April 2007337
May 2007395
June 2007405
July 2007314
August 2007254
September 2007232
October 2007226
November 2007201
December 2007210
January 2008253
February 2008291
March 2008346
April 2008339
May 2008414
June 2008474
July 2008333
August 2008266
September 2008260
October 2008229
November 2008213
December 2008232
January 2009252
February 2009325
March 2009433
April 2009530
May 2009626
June 2009641
July 2009604
August 2009462
September 2009433
October 2009432
November 2009297
December 2009242
January 2010273
February 2010321
March 2010476
April 2010485
May 2010326
June 2010430
July 2010580
August 2010455
September 2010336
October 2010274
November 2010301
December 2010438
January 2011501
February 2011503
March 2011519
April 2011396
May 2011301
June 2011447
July 2011629
August 2011566
September 2011485
October 2011400
November 2011358
December 2011393
January 2012397
February 2012377
March 2012356
April 2012384
May 2012513
June 2012535
July 2012453
August 2012358
September 2012358
October 2012369
November 2012330
December 2012335
January 2013375
February 2013399
March 2013400
April 2013393
May 2013460
June 2013505
July 2013479
August 2013395
September 2013373
October 2013369
November 2013321
December 2013290
January 2014263
February 2014224
March 2014208
April 2014226
May 2014341
June 2014401
July 2014369
August 2014310
September 2014252
October 2014222
November 2014220
December 2014221
January 2015225
February 2015234
March 2015248
April 2015246
May 2015228
June 2015211
July 2015224
August 2015207
September 2015217
October 2015226
November 2015207
December 2015205
January 2016237
February 2016290
March 2016407
April 2016376
May 2016393
June 2016526
July 2016511
August 2016362
September 2016298
October 2016273
November 2016303
December 2016409
January 2017472
February 2017506
March 2017352
April 2017299
May 2017413
June 2017540
July 2017634
August 2017568
September 2017462
October 2017435
November 2017395
December 2017431
January 2018444
February 2018434
March 2018436
April 2018555
May 2018551
June 2018581
July 2018485
August 2018380
September 2018341
October 2018343
November 2018351
December 2018366
January 2019376
February 2019440
March 2019490
April 2019364
May 2019487
June 2019538
July 2019629
August 2019556
September 2019478
October 2019379
November 2019307
December 2019302
January 2020365
February 2020374
March 2020345
April 2020366
May 2020500
June 2020540
July 2020409
August 2020288
September 2020232
October 2020199
November 2020212
December 2020224
January 2021214
February 2021202
March 2021212
April 2021245
May 2021303
June 2021322
July 2021282
August 2021280
September 2021325
October 2021377
November 2021386
December 2021411
January 2022377
February 2022334
March 2022357
April 2022425
May 2022458
June 2022447
July 2022389
August 2022321
September 2022357

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 12.0200400600Mm³123456789101112Month1991–2020 average 1: 360 Mm³1991–2020 average 2: 398 Mm³1991–2020 average 3: 433 Mm³1991–2020 average 4: 455 Mm³1991–2020 average 5: 485 Mm³1991–2020 average 6: 528 Mm³1991–2020 average 7: 488 Mm³1991–2020 average 8: 377 Mm³1991–2020 average 9: 316 Mm³1991–2020 average 10: 289 Mm³1991–2020 average 11: 282 Mm³1991–2020 average 12: 313 Mm³Most recent 12 months 1: 377 Mm³Most recent 12 months 2: 334 Mm³Most recent 12 months 3: 357 Mm³Most recent 12 months 4: 425 Mm³Most recent 12 months 5: 458 Mm³Most recent 12 months 6: 447 Mm³Most recent 12 months 7: 389 Mm³Most recent 12 months 8: 321 Mm³Most recent 12 months 9: 357 Mm³Most recent 12 months 10: 377 Mm³Most recent 12 months 11: 386 Mm³Most recent 12 months 12: 411 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)
Jan360377
Feb398334
Mar433357
Apr455425
May485458
Jun528447
Jul488389
Aug377321
Sep316357
Oct289377
Nov282386
Dec313411

Rate and persistence

+2.66 Mm³
Mean change per month over 12 months
7 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

Millerton Lk A Friant CA
Gauge location
Millerton Lk A Friant CAMillerton Lk A Friant CA — 356.57 Mm³Millerton Lk A Friant CA — 356.57 Mm³

Where this comes from

968 monthly observations 1941–2022 Mm³
Spatially aggregatedHigh confidenceSeptember 2022

Source: USGS — National Water Information System, 11250100. 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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