HydrionisGlobal Water Intelligence
Monitored reservoir

Harlan County Lake Near Republican City, Nebr.

United States Geological Survey reservoir gauge 06849000 in NE, with published storage from 1965.

Storage record06849000

Storage now, against this reservoir's own record

222.56 Mm³
Stored, August 2026
16th
Percentile among 52 Augs on record
-24.2%
Against the Aug 1991–2020 average
-8.9%
Change over the 12 months to 2026-08

Storage in August 2026 was lower than most Augs on record, ranked against 52 other Augs held for this reservoir.

Storage, 1965–2026

Monthly mean storage
624 monthly values, 1965 to 2026
Monthly mean storageMonthly mean storage: Harlan County Lake Near Republican City, Nebr. in Mm³, from 1965.75 to 2026.5833333333333.0200400600Mm³1965.751972.251978.751985.251991.752007.16666666666672013.66666666666672020.1666666666667Year

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
PeriodHarlan County Lake Near Republican City, Nebr. (Mm³)
October 1965447
November 1965421
December 1965422
January 1966419
February 1966428
March 1966427
April 1966428
May 1966424
June 1966435
July 1966453
August 1966425
September 1966431
October 1966429
November 1966422
December 1966427
January 1967434
February 1967439
March 1967423
April 1967419
May 1967422
June 1967463
July 1967474
August 1967408
September 1967383
October 1967381
November 1967391
December 1967408
January 1968422
February 1968436
March 1968446
April 1968426
May 1968429
June 1968427
July 1968377
August 1968335
September 1968337
October 1968341
November 1968350
December 1968358
January 1969365
February 1969357
March 1969392
April 1969420
May 1969426
June 1969423
July 1969420
August 1969399
September 1969400
October 1969418
November 1969431
December 1969421
January 1970422
February 1970426
March 1970432
April 1970420
May 1970414
June 1970417
July 1970370
August 1970287
September 1970262
October 1970269
November 1970277
December 1970285
January 1971292
February 1971304
March 1971323
April 1971337
May 1971365
June 1971385
July 1971353
August 1971290
September 1971267
October 1971271
November 1971281
December 1971295
January 1972305
February 1972314
March 1972329
April 1972340
May 1972358
June 1972375
July 1972362
August 1972324
September 1972310
October 1972312
November 1972322
December 1972332
January 1973344
February 1973361
March 1973383
April 1973413
May 1973431
June 1973429
July 1973396
August 1973373
September 1973354
October 1973383
November 1973400
December 1973418
January 1974435
February 1974439
March 1974430
April 1974434
May 1974429
June 1974445
July 1974392
August 1974322
September 1974310
October 1974277
November 1974284
December 1974291
January 1975300
February 1975311
March 1975328
April 1975343
May 1975354
June 1975388
July 1975388
August 1975336
September 1975312
October 1975310
November 1975314
December 1975323
January 1976335
February 1976350
March 1976365
April 1976384
May 1976402
June 1976402
July 1976331
August 1976245
September 1976204
October 1976207
November 1976210
December 1976215
January 1977221
February 1977228
March 1977243
April 1977266
May 1977297
June 1977327
July 1977275
August 1977223
September 1977244
October 1977247
November 1977252
December 1977258
January 1978266
February 1978273
March 1978299
April 1978331
May 1978348
June 1978351
July 1978298
August 1978262
September 1978234
October 1978227
November 1978225
December 1978227
January 1979229
February 1979232
March 1979255
April 1979278
May 1979298
June 1979305
July 1979309
August 1979288
September 1979282
October 1979278
November 1979284
December 1979292
January 1980304
February 1980319
March 1980349
April 1980383
May 1980400
June 1980410
July 1980360
August 1980273
September 1980249
October 1980244
November 1980244
December 1980247
January 1981253
February 1981260
March 1981270
April 1981280
May 1981297
June 1981308
July 1981281
August 1981287
September 1981287
October 1981288
November 1981294
December 1981307
January 1982331
February 1982343
March 1982365
April 1982377
May 1982395
June 1982420
July 1982427
August 1982379
September 1982362
October 1982363
November 1982368
December 1982378
January 1983391
February 1983409
March 1983424
April 1983419
May 1983435
June 1983442
July 1983409
August 1983337
September 1983308
October 1983311
November 1983315
December 1983322
January 1984328
February 1984343
March 1984365
April 1984397
May 1984419
June 1984417
July 1984392
August 1984321
September 1984282
October 1984282
November 1984289
December 1984297
January 1985305
February 1985315
March 1985337
April 1985353
May 1985378
June 1985390
July 1985357
August 1985323
September 1985303
October 1985310
November 1985318
December 1985325
January 1986333
February 1986346
March 1986361
April 1986376
May 1986400
June 1986412
July 1986360
August 1986303
September 1986285
October 1986288
November 1986293
December 1986301
January 1987308
February 1987318
March 1987333
April 1987364
May 1987389
June 1987395
July 1987373
August 1987337
September 1987328
October 1987326
November 1987331
December 1987340
January 1988346
February 1988359
March 1988381
April 1988399
May 1988412
June 1988393
July 1988327
August 1988293
September 1988278
October 1988279
November 1988282
December 1988289
January 1989295
February 1989303
March 1989313
April 1989325
May 1989330
June 1989330
July 1989309
August 1989268
September 1989253
October 1989252
November 1989256
December 1989260
January 1990251
February 1990262
March 1990276
April 1990288
May 1990301
June 1990312
July 1990270
August 1990239
September 1990220
October 1990212
November 1990211
December 1990214
January 1991217
February 1991224
March 1991234
April 1991243
May 1991253
June 1991262
July 1991223
August 1991180
September 1991167
October 1991162
November 1991161
December 1991166
January 1992176
February 1992186
March 1992199
April 1992210
May 1992214
June 1992217
July 1992205
August 1992208
September 1992198
October 1992201
November 1992207
December 1992214
January 1993224
February 1993239
March 1993302
April 1993348
May 1993369
June 1993382
July 1993420
August 1993505
September 1993513
October 1993479
November 1993429
December 1993393
January 1994394
February 1994394
March 1994397
April 1994403
May 1994421
June 1994416
July 1994388
August 1994352
September 1994329
September 2003150
October 2003147
November 2003145
December 2003144
January 2004143
February 2004144
March 2004146
April 2004147
May 2004148
June 2004145
July 2004145
August 2004143
September 2004138
October 2004137
November 2004136
December 2004136
January 2005135
February 2005139
March 2005145
April 2005159
May 2005164
June 2005174
July 2005174
August 2005171
September 2005168
October 2005164
November 2005162
December 2005162
January 2006163
February 2006165
March 2006168
April 2006173
May 2006174
June 2006171
July 2006156
August 2006151
September 2006148
October 2006146
November 2006145
December 2006145
January 2007149
February 2007155
March 2007188
April 2007208
May 2007249
June 2007286
July 2007304
August 2007310
September 2007307
October 2007306
November 2007306
December 2007311
January 2008318
February 2008325
March 2008337
April 2008350
May 2008372
June 2008429
July 2008404
August 2008382
September 2008384
October 2008394
November 2008399
December 2008391
January 2009391
February 2009391
March 2009393
April 2009397
May 2009406
June 2009410
July 2009391
August 2009366
September 2009352
October 2009352
November 2009366
December 2009383
January 2010392
February 2010407
March 2010413
April 2010408
May 2010410
June 2010425
July 2010430
August 2010391
September 2010373
October 2010371
November 2010374
December 2010383
January 2011395
February 2011403
March 2011407
April 2011397
May 2011399
June 2011411
July 2011399
August 2011377
September 2011371
October 2011382
November 2011391
December 2011394
January 2012397
February 2012407
March 2012395
April 2012392
May 2012391
June 2012371
July 2012326
August 2012271
September 2012248
October 2012243
November 2012240
December 2012239
January 2013239
February 2013240
March 2013244
April 2013254
May 2013261
June 2013263
July 2013229
August 2013203
September 2013179
October 2013175
November 2013172
December 2013160
January 2014157
February 2014158
March 2014167
April 2014180
May 2014191
June 2014208
July 2014216
August 2014192
September 2014182
October 2014181
November 2014180
December 2014183
January 2015190
February 2015202
March 2015216
April 2015229
May 2015237
June 2015248
July 2015235
August 2015212
September 2015194
October 2015190
November 2015192
December 2015203
January 2016217
February 2016234
March 2016250
April 2016271
May 2016295
June 2016305
July 2016281
August 2016250
September 2016241
October 2016239
November 2016239
December 2016241
January 2017246
February 2017257
March 2017266
April 2017280
May 2017305
June 2017320
July 2017307
August 2017286
September 2017270
October 2017272
November 2017272
December 2017276
January 2018280
February 2018285
March 2018295
April 2018304
May 2018313
June 2018313
July 2018294
August 2018278
September 2018278
October 2018282
November 2018292
December 2018306
January 2019322
February 2019336
March 2019376
April 2019418
May 2019436
June 2019489
July 2019584
August 2019575
September 2019555
October 2019538
November 2019486
December 2019424
January 2020390
February 2020387
March 2020387
April 2020387
May 2020389
June 2020397
July 2020382
August 2020367
September 2020344
October 2020338
November 2020338
December 2020341
January 2021347
February 2021355
March 2021371
April 2021387
May 2021390
June 2021392
July 2021368
August 2021343
September 2021340
October 2021339
November 2021339
December 2021342
January 2022346
February 2022351
March 2022359
April 2022366
May 2022382
June 2022382
July 2022356
August 2022323
September 2022291
October 2022285
November 2022281
December 2022280
January 2023282
February 2023286
March 2023292
April 2023295
May 2023301
June 2023314
July 2023302
August 2023280
September 2023264
October 2023264
November 2023263
December 2023269
January 2024276
February 2024285
March 2024294
April 2024304
May 2024324
June 2024339
July 2024324
August 2024295
September 2024269
October 2024262
November 2024263
December 2024266
January 2025269
February 2025274
March 2025282
April 2025289
May 2025292
June 2025289
July 2025270
August 2025244
September 2025230
October 2025229
November 2025229
December 2025234
January 2026240
February 2026245
March 2026257
April 2026264
May 2026266
June 2026269
July 2026250
August 2026223

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 12.0100200300400Mm³123456789101112Month1991–2020 average 1: 264 Mm³1991–2020 average 2: 270 Mm³1991–2020 average 3: 282 Mm³1991–2020 average 4: 293 Mm³1991–2020 average 5: 305 Mm³1991–2020 average 6: 316 Mm³1991–2020 average 7: 309 Mm³1991–2020 average 8: 294 Mm³1991–2020 average 9: 277 Mm³1991–2020 average 10: 271 Mm³1991–2020 average 11: 268 Mm³1991–2020 average 12: 266 Mm³Most recent 12 months 1: 240 Mm³Most recent 12 months 2: 245 Mm³Most recent 12 months 3: 257 Mm³Most recent 12 months 4: 264 Mm³Most recent 12 months 5: 266 Mm³Most recent 12 months 6: 269 Mm³Most recent 12 months 7: 250 Mm³Most recent 12 months 8: 223 Mm³Most recent 12 months 9: 230 Mm³Most recent 12 months 10: 229 Mm³Most recent 12 months 11: 229 Mm³Most recent 12 months 12: 234 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)
Jan264240
Feb270245
Mar282257
Apr293264
May305266
Jun316269
Jul309250
Aug294223
Sep277230
Oct271229
Nov268229
Dec266234

Rate and persistence

-1.81 Mm³
Mean drawdown per month over 12 months
8 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

Harlan County Lake Near Republican City, Nebr.
Gauge location
Harlan County Lake Near Republican City, Nebr.Harlan County Lake Near Republican City, Nebr. — 222.56 Mm³Harlan County Lake Near Republican City, Nebr. — 222.56 Mm³

Where this comes from

624 monthly observations 1965–2026 Mm³
Spatially aggregatedHigh confidenceAugust 2026

Source: USGS — National Water Information System, 06849000. 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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