Lk Colorado City, TX — storage

Storage now, against this reservoir's own record

20.78 Mm³

Stored, November 2002

29th

Percentile among 53 Novs on record

-5.9%

Change over the 12 months to 2002-11

Storage in November 2002 was lower than most Novs on record, ranked against 53 other Novs held for this reservoir.

No percentage departure from the Nov 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

632 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 632 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 632 would be longer than this page and unusable with a screen reader.
Period	Lk Colorado City Nr Colorado City, TX (Mm³)
April 1949	1.84
July 1949	7.87
September 1949	8.06
December 1949	7.77
March 1950	7.42
May 1950	13.4
August 1950	21.9
October 1950	27.3
January 1951	25.0
April 1951	23.2
June 1951	22.1
September 1951	19.7
December 1951	17.8
February 1952	17.1
May 1952	15.6
August 1952	13.2
October 1952	17.9
January 1953	16.8
April 1953	15.4
June 1953	13.9
September 1953	12.5
November 1953	17.0
February 1954	15.8
May 1954	27.2
July 1954	33.4
October 1954	28.1
January 1955	26.4
March 1955	25.4
June 1955	28.2
September 1955	26.7
November 1955	29.7
February 1956	28.0
April 1956	26.5
July 1956	27.8
October 1956	24.4
December 1956	23.3
March 1957	22.5
June 1957	39.7
August 1957	35.9
November 1957	35.1
February 1958	33.9
April 1958	33.5
July 1958	31.8
October 1958	28.5
December 1958	27.4
March 1959	26.0
May 1959	24.7
August 1959	25.3
November 1959	25.6
January 1960	25.2
April 1960	23.5
July 1960	22.3
September 1960	20.7
December 1960	19.9
March 1961	19.0
May 1961	18.4
August 1961	34.1
October 1961	31.3
January 1962	30.3
April 1962	28.3
June 1962	26.6
September 1962	37.4
December 1962	36.9
February 1963	35.6
May 1963	33.9
August 1963	30.5
October 1963	28.2
January 1964	26.7
April 1964	24.9
June 1964	24.1
September 1964	21.1
November 1965	23.8
February 1966	22.2
May 1966	39.4
July 1966	38.1
October 1966	35.4
January 1967	32.4
March 1967	30.8
June 1967	27.2
September 1967	23.8
November 1967	22.1
February 1968	21.0
April 1968	20.5
July 1968	18.0
October 1968	17.9
December 1968	20.1
March 1969	20.8
June 1969	26.7
August 1969	23.3
November 1969	20.1
February 1970	18.5
April 1970	18.1
July 1970	17.8
October 1970	17.4
December 1970	17.9
March 1971	17.6
May 1971	15.0
August 1971	19.4
November 1971	20.7
January 1972	19.2
April 1972	18.1
July 1972	18.0
September 1972	20.0
December 1972	24.1
March 1973	26.3
May 1973	26.0
August 1973	22.7
October 1973	21.1
January 1974	18.5
April 1974	17.7
June 1974	17.6
September 1974	19.1
December 1974	34.4
February 1975	33.5
May 1975	30.7
August 1975	30.8
October 1975	32.4
January 1976	30.8
April 1976	28.3
June 1976	26.4
September 1976	25.7
November 1976	25.8
February 1977	24.4
May 1977	22.7
July 1977	21.0
October 1977	18.2
January 1978	18.1
March 1978	18.8
June 1978	18.2
September 1978	18.0
November 1978	18.5
February 1979	19.3
May 1979	19.7
July 1979	21.4
October 1979	19.3
December 1979	19.3
March 1980	21.3
June 1980	21.2
August 1980	18.0
November 1980	38.3
February 1981	37.6
April 1981	38.4
July 1981	36.9
October 1981	32.8
December 1981	31.3
March 1982	29.4
May 1982	28.6
August 1982	35.3
November 1982	30.8
January 1983	30.4
April 1983	28.3
July 1983	24.6
September 1983	23.7
December 1983	23.8
March 1984	21.9
May 1984	21.8
August 1984	21.2
November 1984	21.9
January 1985	21.7
April 1985	20.3
June 1985	23.0
September 1985	23.2
December 1985	24.0
February 1986	22.9
May 1986	21.5
August 1986	28.9
October 1986	40.6
January 1987	38.8
April 1987	38.0
June 1987	39.4
September 1987	35.6
November 1987	33.2
February 1988	31.7
May 1988	28.9
July 1988	29.6
October 1988	28.3
January 1989	26.1
March 1989	26.2
June 1989	26.6
September 1989	26.3
November 1989	24.0
February 1990	22.5
May 1990	23.9
July 1990	23.6
October 1990	27.9
December 1990	26.6
March 1991	25.6
June 1991	24.8
August 1991	26.1
November 1991	27.6
February 1992	33.2
April 1992	35.0
July 1992	37.9
October 1992	36.0
December 1992	34.6
March 1993	33.6
May 1993	31.9
August 1993	31.6
November 1993	31.1
January 1994	30.2
April 1994	28.6
July 1994	28.4
September 1994	28.7
December 1994	27.3
March 1995	26.1
May 1995	26.4
August 1995	26.7
November 1995	26.9
January 1996	25.8
April 1996	23.2
June 1996	22.0
September 1996	22.8
December 1996	23.0
February 1997	22.7
May 1997	22.6
August 1997	25.8
October 1997	25.4
January 1998	24.3
April 1998	22.6
June 1998	21.0
September 1998	19.8
November 1998	19.4
February 1999	17.9
May 1999	18.6
July 1999	19.8
October 1999	19.5
January 2000	17.5
March 2000	22.2
June 2000	33.4
September 2000	28.0
November 2000	26.7
February 2001	25.7
May 2001	25.4
July 2001	22.6
October 2001	21.1
December 2001	23.8
March 2002	22.7
June 2002	22.0
August 2002	21.4
November 2002	20.8

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

-0.11 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

Lk Colorado City Nr Colorado City, 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	97.5% 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 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-08123000.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 Colorado City Nr Colorado City, TX reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-08123000/

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 Colorado City Nr Colorado City, 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

632 monthly observations 1949–2002 Mm³

Spatially aggregatedHigh confidenceNovember 2002

Source: USGS — National Water Information System, 08123000. 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.