Red Bluff Res, TX — storage

Storage now, against this reservoir's own record

121.88 Mm³

Stored, September 1993

76th

Percentile among 56 Seps on record

-32.5%

Change over the 12 months to 1993-09

Storage in September 1993 was higher than most Seps on record, ranked against 56 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, 1937–1993

Monthly mean storage

668 monthly values, 1937 to 1993

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 668 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 668 would be longer than this page and unusable with a screen reader.
Period	Red Bluff Res Nr Orla, TX (Mm³)
February 1937	54.0
May 1937	17.5
August 1937	313
October 1937	326
January 1938	323
April 1938	291
July 1938	241
October 1938	176
December 1938	179
March 1939	193
June 1939	133
September 1939	65.7
November 1939	58.3
February 1940	86.3
May 1940	64.7
August 1940	39.2
November 1940	57.2
January 1941	76.6
April 1941	80.0
July 1941	391
October 1941	392
January 1942	386
March 1942	383
June 1942	379
September 1942	354
December 1942	370
March 1943	370
May 1943	323
August 1943	252
November 1943	232
February 1944	285
May 1944	225
July 1944	172
October 1944	146
January 1945	183
April 1945	167
June 1945	111
September 1945	38.0
December 1945	55.9
March 1946	73.7
June 1946	34.0
August 1946	16.5
November 1946	61.4
February 1947	99.0
May 1947	54.5
August 1947	16.5
October 1947	18.9
January 1948	34.4
April 1948	34.5
July 1948	30.2
October 1948	23.1
December 1948	32.8
March 1949	51.1
June 1949	42.4
September 1949	42.1
November 1949	100
February 1950	139
May 1950	88.9
August 1950	56.6
November 1950	96.6
January 1951	123
April 1951	117
July 1951	50.1
October 1951	36.8
January 1952	48.2
March 1952	54.5
June 1952	35.4
September 1952	16.7
December 1952	29.5
March 1953	39.0
May 1953	37.8
August 1953	31.4
November 1953	41.3
February 1954	46.0
May 1954	45.8
July 1954	33.6
October 1954	138
January 1955	202
April 1955	159
June 1955	115
September 1955	28.4
December 1955	121
March 1956	126
June 1956	84.6
August 1956	40.1
November 1956	30.9
February 1957	25.7
May 1957	19.2
August 1957	28.6
October 1957	23.7
January 1958	37.1
April 1958	38.4
July 1958	54.2
October 1958	104
December 1958	127
March 1959	139
June 1959	122
September 1959	80.7
November 1959	82.8
February 1960	92.0
May 1960	71.9
August 1960	116
November 1960	119
January 1961	146
April 1961	150
July 1961	106
October 1961	61.0
January 1962	72.7
March 1962	77.3
June 1962	59.8
September 1962	39.5
December 1962	26.0
March 1963	35.9
May 1963	36.0
August 1963	30.5
November 1963	38.2
February 1964	43.4
May 1964	35.3
July 1964	23.8
October 1964	23.0
January 1965	24.2
April 1965	25.0
June 1965	60.3
September 1965	62.5
December 1965	63.7
March 1966	63.4
June 1966	68.6
August 1966	122
November 1966	308
February 1967	285
May 1967	202
August 1967	144
October 1967	122
January 1968	125
April 1968	116
July 1968	94.4
October 1968	64.6
December 1968	67.6
March 1969	69.2
June 1969	56.8
September 1969	41.1
December 1969	121
February 1970	127
May 1970	115
August 1970	84.8
November 1970	74.5
January 1971	79.3
April 1971	73.6
July 1971	42.9
October 1971	51.4
January 1972	54.9
March 1972	56.2
June 1972	40.0
September 1972	46.3
December 1973	69.7
March 1974	67.5
May 1974	53.9
August 1974	30.1
November 1974	193
February 1975	216
May 1975	196
July 1975	176
October 1975	141
January 1976	140
April 1976	131
June 1976	108
September 1976	79.8
December 1976	84.2
March 1977	79.8
June 1977	61.5
August 1977	39.3
November 1977	27.4
February 1978	30.2
May 1978	30.3
August 1978	41.1
October 1978	119
January 1979	131
April 1979	136
July 1979	120
October 1979	93.3
December 1979	94.4
March 1980	105
June 1980	80.5
September 1980	47.5
December 1980	88.1
February 1981	95.6
May 1981	92.1
August 1981	68.7
November 1981	66.5
January 1982	72.6
April 1982	66.7
July 1982	60.2
October 1982	58.5
January 1983	66.5
March 1983	71.2
June 1983	54.9
September 1983	43.4
December 1983	53.1
March 1984	57.7
May 1984	52.7
August 1984	90.3
November 1984	113
February 1985	122
May 1985	109
July 1985	88.6
October 1985	80.2
January 1986	92.2
April 1986	83.1
June 1986	101
September 1986	250
December 1986	285
March 1987	341
June 1987	316
August 1987	283
November 1987	268
February 1988	277
May 1988	255
August 1988	227
October 1988	221
January 1989	224
April 1989	207
July 1989	152
October 1989	119
December 1989	120
March 1990	124
June 1990	90.7
September 1990	74.9
December 1990	87.4
February 1991	94.3
May 1991	78.4
August 1991	67.7
November 1991	110
January 1992	154
April 1992	155
July 1992	189
October 1992	182
January 1993	194
March 1993	197
June 1993	157
September 1993	122

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

-4.89 Mm³

Mean drawdown per month over 12 months

0 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

Red Bluff Res Nr Orla, 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	1937–1993
Completeness	97.7% 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	98% of the months between 1937 and 1993 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-08410000.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), Red Bluff Res Nr Orla, TX reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-08410000/

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 Red Bluff Res Nr Orla, 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

668 monthly observations 1937–1993 Mm³

Spatially aggregatedHigh confidenceSeptember 1993

Source: USGS — National Water Information System, 08410000. 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.