Lk Brownwood, TX — storage

Storage now, against this reservoir's own record

177.26 Mm³

Stored, September 1986

98th

Percentile among 49 Seps on record

+30.5%

Change over the 12 months to 1986-09

Storage in September 1986 was higher than almost every other Sep on record, ranked against 49 other Seps held for this reservoir.

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

Storage, 1933–1986

Monthly mean storage

581 monthly values, 1933 to 1986

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 581 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 581 would be longer than this page and unusable with a screen reader.
Period	Lk Brownwood Nr Brownwood, TX (Mm³)
July 1933	65.1
September 1933	59.9
December 1933	54.0
February 1934	54.3
May 1934	92.7
April 1935	32.7
July 1935	170
September 1935	180
November 1935	147
February 1936	128
April 1936	128
July 1936	172
September 1936	169
December 1936	151
February 1937	130
April 1937	129
July 1937	149
September 1937	142
December 1937	139
February 1938	142
May 1938	132
July 1938	151
September 1938	151
December 1938	145
February 1939	153
May 1939	173
July 1939	172
October 1939	139
December 1939	135
February 1940	132
May 1940	167
July 1940	181
November 1944	166
January 1945	168
April 1945	180
June 1945	167
August 1945	171
November 1945	156
January 1946	151
April 1946	157
June 1946	160
August 1946	154
November 1946	184
January 1947	175
April 1947	158
June 1947	159
September 1947	128
November 1947	117
January 1948	146
April 1948	138
June 1948	135
September 1948	137
November 1948	131
February 1949	128
April 1949	140
June 1949	167
September 1949	145
November 1949	151
February 1950	144
April 1950	136
July 1950	144
September 1950	139
November 1950	128
February 1951	118
April 1951	111
July 1951	158
September 1951	140
December 1951	126
February 1952	120
April 1952	115
July 1952	142
September 1952	123
December 1952	115
February 1953	114
May 1953	145
July 1953	163
September 1953	165
December 1953	159
February 1954	153
May 1954	171
July 1954	152
October 1954	126
December 1954	122
February 1955	120
May 1955	135
July 1955	168
October 1955	165
December 1955	151
March 1956	144
May 1956	173
July 1956	144
October 1956	119
December 1956	115
March 1957	111
May 1957	183
August 1957	147
October 1957	157
December 1957	143
March 1958	144
May 1958	156
August 1958	132
October 1958	134
January 1959	125
March 1959	119
May 1959	114
August 1959	160
October 1959	172
January 1960	175
March 1960	165
June 1960	150
August 1960	135
October 1960	130
January 1961	147
March 1961	159
June 1961	177
August 1961	154
November 1961	160
January 1962	158
March 1962	152
June 1962	156
August 1962	164
November 1962	163
January 1963	158
March 1963	152
June 1963	176
August 1963	146
November 1963	130
January 1964	127
April 1964	142
June 1964	160
August 1964	140
November 1964	172
January 1965	165
April 1965	163
June 1965	169
September 1965	140
November 1965	143
January 1966	140
April 1966	134
June 1966	168
September 1966	172
November 1966	161
February 1967	149
April 1967	144
June 1967	144
September 1967	140
November 1967	145
February 1968	178
April 1968	180
July 1968	166
September 1968	151
November 1968	142
February 1969	137
April 1969	145
July 1969	169
September 1969	170
December 1969	178
February 1970	178
April 1970	170
July 1970	159
September 1970	144
December 1970	133
February 1971	127
May 1971	112
July 1971	103
September 1971	169
December 1971	178
February 1972	175
May 1972	163
July 1972	151
October 1972	136
December 1972	130
February 1973	130
May 1973	140
July 1973	132
October 1973	134
December 1973	138
March 1974	128
May 1974	121
July 1974	108
October 1974	183
December 1974	178
March 1975	177
May 1975	178
August 1975	167
October 1975	153
December 1975	146
March 1976	136
May 1976	132
August 1976	117
October 1976	110
January 1977	109
March 1977	108
May 1977	138
August 1977	116
October 1977	103
January 1978	94.5
March 1978	92.3
June 1978	81.7
August 1978	154
October 1978	167
January 1979	157
March 1979	162
June 1979	177
August 1979	173
October 1979	162
January 1980	152
March 1980	148
June 1980	154
August 1980	135
November 1980	129
January 1981	128
March 1981	136
June 1981	141
August 1981	129
November 1981	179
January 1982	172
April 1982	168
June 1982	184
August 1982	167
November 1982	147
January 1983	145
April 1983	145
June 1983	152
September 1983	137
November 1983	131
January 1984	124
April 1984	125
June 1984	121
September 1984	103
November 1984	118
February 1985	151
April 1985	158
June 1985	155
September 1985	136
November 1985	144
February 1986	141
April 1986	135
July 1986	172
September 1986	177

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

+3.45 Mm³

Mean change per month over 12 months

3 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 Brownwood Nr Brownwood, 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	1933–1986
Completeness	89.7% 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	90% of the months between 1933 and 1986 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-08143000.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 Brownwood Nr Brownwood, TX reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-08143000/

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 Brownwood Nr Brownwood, 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

581 monthly observations 1933–1986 Mm³

Spatially aggregatedHigh confidenceSeptember 1986

Source: USGS — National Water Information System, 08143000. 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.