Lk Kemp, TX — storage

Storage now, against this reservoir's own record

165.75 Mm³

Stored, February 2002

8th

Percentile among 51 Febs on record

-12.0%

Change over the 12 months to 2002-02

Storage in February 2002 was lower than almost every other Feb on record, ranked against 51 other Febs held for this reservoir.

No percentage departure from the Feb average is published here. No long-term average is held for this month, so there is nothing to compare with.

Storage, 1949–2002

Monthly mean storage

605 monthly values, 1949 to 2002

Monthly means of the publisher's daily record. Volume, not percentage of capacity — see below for why.

What the shaded periods are (0 events)

Not shown on this chart

The 1976 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
The 2022 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Yorkshire drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
European drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

240 of 605 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 605 would be longer than this page and unusable with a screen reader.
Period	Lk Kemp Nr Mabelle, TX (Mm³)
October 1949	414
January 1950	364
March 1950	349
June 1950	402
August 1950	467
November 1950	333
January 1951	317
April 1951	314
June 1951	357
September 1951	296
November 1951	287
February 1952	247
April 1952	218
July 1952	182
September 1952	109
December 1952	70.8
February 1953	67.2
May 1953	59.1
July 1953	47.4
October 1953	105
January 1954	172
March 1954	155
June 1954	410
August 1954	351
November 1954	277
January 1955	271
April 1955	275
June 1955	341
September 1955	301
November 1955	415
February 1956	394
April 1956	368
July 1956	299
September 1956	219
December 1956	199
February 1957	198
May 1957	414
August 1957	382
October 1957	357
January 1958	394
March 1958	399
June 1958	348
August 1958	328
November 1958	294
January 1959	279
April 1959	242
June 1959	271
September 1959	251
November 1959	288
February 1960	307
April 1960	294
July 1960	322
September 1960	281
December 1960	392
February 1961	401
May 1961	384
August 1961	343
October 1961	331
January 1962	330
March 1962	312
June 1962	329
August 1962	311
November 1962	367
January 1963	379
April 1963	358
June 1963	380
September 1963	293
November 1963	265
February 1964	268
April 1964	254
July 1964	228
September 1964	168
December 1964	230
February 1965	223
May 1965	219
August 1965	176
October 1965	256
January 1966	297
March 1966	298
June 1966	290
August 1966	283
November 1966	385
January 1967	372
April 1967	370
June 1967	389
September 1967	366
November 1967	353
February 1968	388
April 1968	372
July 1968	363
September 1968	314
December 1968	296
March 1969	299
May 1969	320
August 1969	269
October 1969	346
January 1970	376
March 1970	394
June 1970	350
August 1970	263
November 1970	231
January 1971	214
April 1971	158
June 1971	137
September 1971	108
November 1971	153
February 1972	161
April 1972	145
July 1972	236
September 1972	249
December 1972	240
March 1973	253
May 1973	303
August 1973	248
October 1973	191
January 1974	188
March 1974	191
June 1974	178
August 1974	128
November 1974	179
January 1975	170
April 1975	165
June 1975	219
September 1975	273
November 1975	277
February 1976	268
April 1976	255
July 1976	237
September 1976	206
December 1976	257
March 1977	261
May 1977	294
August 1977	262
October 1977	229
January 1978	202
March 1978	206
June 1978	192
August 1978	176
November 1978	187
January 1979	190
April 1979	187
June 1979	204
September 1979	188
November 1979	168
February 1980	180
April 1980	167
July 1980	179
September 1980	127
December 1980	146
March 1981	166
May 1981	180
August 1981	205
October 1981	190
January 1982	193
March 1982	199
June 1982	303
August 1982	318
November 1982	273
January 1983	280
April 1983	293
June 1983	290
September 1983	215
November 1983	345
February 1984	348
April 1984	332
July 1984	256
October 1984	219
December 1984	242
March 1985	284
May 1985	300
August 1985	289
October 1985	278
January 1986	309
March 1986	304
June 1986	335
August 1986	323
November 1986	369
January 1987	339
April 1987	333
June 1987	416
September 1987	312
November 1987	285
February 1988	289
April 1988	290
July 1988	240
October 1988	219
December 1988	210
March 1989	209
May 1989	234
August 1989	307
October 1989	327
January 1990	313
March 1990	338
June 1990	361
August 1990	334
November 1990	306
January 1991	313
April 1991	295
June 1991	344
September 1991	322
November 1992	273
February 1993	315
April 1993	319
July 1993	315
October 1993	259
December 1993	256
March 1994	271
May 1994	273
August 1994	239
October 1994	226
January 1995	275
March 1995	267
June 1995	400
August 1995	399
November 1996	249
January 1997	254
April 1997	295
June 1997	336
September 1997	305
November 1997	293
February 1998	326
May 1998	324
July 1998	277
October 1998	184
December 1998	181
March 1999	199
May 1999	236
August 1999	249
October 1999	195
January 2000	180
March 2000	183
June 2000	193
August 2000	159
November 2000	155
January 2001	176
April 2001	237
June 2001	240
September 2001	163
November 2001	152
February 2002	166

Why this page shows a volume and not a percentage

Percentage full is a division, and the denominator is missing

“Percentage full” is the figure a drought is discussed in, and it is stored volume divided by capacity. Capacity is published on several different bases — gross, usable, live, and the figure at a particular spillway or licence condition — and dividing a stored volume by the wrong one produces a percentage confidently wrong by the ratio between them, at exactly the moment the number matters most.

Hydrionis holds storage measurements for this reservoir and does not hold a compatible authoritative capacity figure for it, so percentage full is not calculated. The volume above is what was actually measured. Where you need a percentage, take the publisher’s own capacity on its own stated basis and divide it yourself — the source is linked below, and knowing which basis you used is the whole point.

Rate and persistence

-1.88 Mm³

Mean drawdown per month over 12 months

19 of 24

Recent months 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

Lk Kemp Nr Mabelle, TX

Gauge location

About this data

Everything below is a property of the data rather than a rating of it. There is deliberately no single confidence score: how much a gap matters depends on what you are about to do with the series, and only you know that.

Source	United States Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Measured
Period held	1949–2002
Completeness	93.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	Storage is a managed quantity. A falling line can be a rule curve, a scheduled release or a transfer to another system rather than a shortage of water, and nothing here distinguishes them. No capacity figure on a stated basis is held for this reservoir, so no percentage of capacity is computed.
Continuity	93% of the months between 1949 and 2002 are held. Monthly means of the publisher's own daily record.
Last read from the publisher	2026-10-01
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

Use this data

Machine-readable JSON /api/v1/observations/by-subject/reservoir-usgs-07312000.json
How to cite this, and who you must credit
How these figures were produced
Request this at a different scale, format or geography

No bulk download is offered here, which is a licence position rather than a product one: at least one contributing publisher does not permit redistribution. The values can be read on the page, cited, and pointed to at source.

Attribution and citation

Suggested citation for Hydrionis

Hydrionis (2026), Lk Kemp Nr Mabelle, TX reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-07312000/

Cite Hydrionis where you rely on the compilation, the normalisation, the eligibility judgements or a chart. Where you use an unmodified published value, the publisher’s attribution is the one that is required; crediting Hydrionis as well is welcome and is not something Hydrionis can require of you.

Recommended, not required. Hydrionis does not claim rights over unmodified public data it relayed, and doing arithmetic on somebody else’s measurements does not make them Hydrionis’s. Cite the version and the access date: the Lk Kemp Nr Mabelle, TX record changes as publishers release and as methods are revised, and a citation without both cannot be checked later. Full guidance is on cite and reuse.

None of the contributing licences requires attribution. Crediting the publishers is still good practice and they are listed above.

Where this comes from

605 monthly observations 1949–2002 Mm³

Spatially aggregatedHigh confidenceFebruary 2002

Source: USGS — National Water Information System, 07312000. 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 1 October 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.