Topaz Lake, CA — storage

Storage now, against this reservoir's own record

26.77 Mm³

Stored, September 1970

63rd

Percentile among 36 Seps on record

-37.9%

Change over the 12 months to 1970-09

Storage in September 1970 was around the middle of the Sep record, ranked against 36 other Seps held for this reservoir.

Storage, 1931–1970

Monthly mean storage

316 monthly values, 1931 to 1970

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
Period	Topaz Lake Nr Topaz, CA (Mm³)
October 1931	0.686
November 1931	0.935
December 1931	3.04
January 1932	7.48
February 1932	12.9
March 1932	19.6
April 1932	24.6
May 1932	28.5
June 1932	48.4
July 1932	53.6
August 1932	39.4
September 1932	23.1
October 1932	19.2
November 1932	20.5
December 1932	24.6
January 1933	29.3
February 1933	35.3
March 1933	40.0
April 1933	43.2
May 1933	37.8
June 1933	42.4
July 1933	41.2
August 1933	20.2
September 1933	7.63
April 1934	27.8
May 1934	25.6
June 1934	24.8
July 1934	19.1
August 1934	6.71
September 1934	2.38
April 1935	33.8
May 1935	35.5
June 1935	47.2
July 1935	52.1
August 1935	33.4
May 1936	47.9
June 1936	47.9
July 1936	52.3
August 1936	36.0
September 1936	25.0
May 1937	53.8
June 1937	62.4
July 1937	56.0
August 1937	34.7
September 1937	18.1
May 1938	59.1
June 1938	66.9
July 1938	64.6
August 1938	62.5
September 1938	50.0
May 1939	68.3
June 1939	62.1
July 1939	46.2
August 1939	27.8
September 1939	13.0
May 1940	49.8
June 1940	70.9
July 1940	65.5
August 1940	39.0
September 1940	21.7
June 1941	71.8
July 1941	73.4
August 1941	60.2
September 1941	43.1
July 1943	73.9
August 1943	59.2
September 1943	39.3
May 1944	65.3
June 1944	72.5
July 1944	67.6
August 1944	40.6
September 1944	21.3
October 1944	18.0
May 1946	72.6
June 1946	72.7
July 1946	65.9
August 1946	43.5
September 1946	23.3
April 1947	61.9
May 1947	67.0
June 1947	71.8
July 1947	51.8
August 1947	27.1
September 1947	14.4
May 1948	26.3
June 1948	43.0
July 1948	51.5
August 1948	31.8
September 1948	15.6
October 1948	9.92
April 1949	27.7
May 1949	33.7
June 1949	57.5
July 1949	46.8
August 1949	24.4
September 1949	10.6
October 1949	5.48
April 1950	28.4
May 1950	27.4
June 1950	57.9
July 1950	61.0
August 1950	39.4
September 1950	22.9
October 1950	18.4
November 1950	29.5
December 1950	59.7
January 1951	65.1
February 1951	72.7
March 1951	73.3
April 1951	71.1
May 1951	70.1
June 1951	73.2
July 1951	66.8
August 1951	45.5
September 1951	27.9
October 1951	19.7
April 1952	34.4
May 1952	29.3
June 1952	56.3
July 1952	70.6
August 1952	68.0
September 1952	49.2
October 1952	38.8
April 1953	70.5
May 1953	65.9
June 1953	69.9
July 1953	71.9
August 1953	53.5
September 1953	34.5
April 1954	62.6
May 1954	64.3
June 1954	66.6
July 1954	50.0
August 1954	26.4
September 1954	9.25
April 1955	26.5
May 1955	24.3
June 1955	45.5
July 1955	44.3
August 1955	23.8
September 1955	8.15
October 1955	3.66
November 1955	4.15
January 1956	34.0
February 1956	53.3
March 1956	61.4
April 1956	63.7
May 1956	65.8
June 1956	71.7
July 1956	73.4
August 1956	66.4
September 1956	46.7
October 1956	40.4
March 1957	72.3
April 1957	69.3
May 1957	60.6
June 1957	72.2
July 1957	62.8
August 1957	35.4
September 1957	16.1
October 1957	11.8
November 1957	16.0
December 1957	21.7
January 1958	26.9
February 1958	32.6
March 1958	41.6
April 1958	47.9
May 1958	53.7
June 1958	71.3
July 1958	73.1
August 1958	65.1
September 1958	46.3
October 1958	34.7
November 1958	36.6
December 1958	43.5
January 1959	51.2
February 1959	59.4
March 1959	67.7
April 1959	67.4
May 1959	57.1
June 1959	50.0
July 1959	33.3
August 1959	14.0
September 1959	5.37
October 1959	4.08
November 1959	5.03
December 1959	8.37
January 1960	11.8
February 1960	17.3
March 1960	21.5
April 1960	21.8
May 1960	19.3
June 1960	21.9
July 1960	13.5
August 1960	3.78
September 1960	0.363
October 1960	0.150
November 1960	2.21
December 1960	6.04
January 1961	10.1
February 1961	14.0
March 1961	17.3
April 1961	17.9
May 1961	17.2
June 1961	18.3
July 1961	14.0
August 1961	6.69
September 1961	4.07
October 1961	2.36
November 1961	3.47
December 1961	6.99
January 1962	10.9
February 1962	17.9
March 1962	26.4
April 1962	35.3
May 1962	39.8
June 1962	58.3
July 1962	68.5
August 1962	46.9
September 1962	26.8
October 1962	21.2
November 1962	25.2
December 1962	29.9
January 1963	33.8
February 1963	57.7
March 1963	69.1
April 1963	73.2
May 1963	68.4
June 1963	73.2
July 1963	72.3
August 1963	55.6
September 1963	36.6
October 1963	32.1
November 1963	36.8
December 1963	46.0
January 1964	52.9
February 1964	59.0
March 1964	63.7
April 1964	63.1
May 1964	55.1
June 1964	60.8
July 1964	49.2
August 1964	27.7
September 1964	13.6
October 1964	8.98
November 1964	9.65
December 1964	17.5
January 1965	40.1
February 1965	51.7
March 1965	59.2
April 1965	59.3
May 1965	51.7
June 1965	62.7
July 1965	73.0
August 1965	70.0
September 1965	55.3
October 1965	49.7
November 1965	55.1
December 1965	58.1
January 1966	60.0
February 1966	64.2
March 1966	69.9
April 1966	70.6
May 1966	66.7
June 1966	64.5
July 1966	41.7
August 1966	21.4
September 1966	9.06
October 1966	6.84
November 1966	7.51
December 1966	18.9
January 1967	27.7
February 1967	37.9
March 1967	47.5
April 1967	52.1
May 1967	38.3
June 1967	48.2
July 1967	69.4
August 1967	66.9
September 1967	53.6
October 1967	50.4
November 1967	53.4
December 1967	59.9
January 1968	66.0
February 1968	71.2
March 1968	73.2
April 1968	69.4
May 1968	60.8
June 1968	63.6
July 1968	47.8
August 1968	26.7
September 1968	12.8
October 1968	9.27
November 1968	13.0
December 1968	19.5
January 1969	27.9
February 1969	37.9
March 1969	24.6
April 1969	18.6
May 1969	28.1
June 1969	56.3
July 1969	71.0
August 1969	65.3
September 1969	43.1
October 1969	38.6
November 1969	46.2
December 1969	53.6
January 1970	64.3
February 1970	69.6
March 1970	73.2
April 1970	72.5
May 1970	68.0
June 1970	72.9
July 1970	70.3
August 1970	45.7
September 1970	26.8

Rate and persistence

-1.36 Mm³

Mean drawdown per month over 12 months

3 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

Topaz Lake Nr Topaz, CA

Gauge location

Where this comes from

316 monthly observations 1931–1970 Mm³

Spatially aggregatedHigh confidenceSeptember 1970

Source: USGS — National Water Information System, 10297000. 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.