Mackay Res — storage

Storage now, against this reservoir's own record

0.43 Mm³

Stored, September 1959

14th

Percentile among 29 Seps on record

-96.6%

Change over the 12 months to 1959-09

Storage in September 1959 was lower than most Seps on record, ranked against 29 other Seps held for this reservoir.

Storage, 1930–1959

Monthly mean storage

348 monthly values, 1930 to 1959

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	Mackay Res Nr Mackay ID (Mm³)
October 1930	0.655
November 1930	6.85
December 1930	15.0
January 1931	20.8
February 1931	24.7
March 1931	27.4
April 1931	29.4
May 1931	28.4
June 1931	16.9
July 1931	6.36
August 1931	1.50
September 1931	0.016
October 1931	0
November 1931	3.39
December 1931	9.32
January 1932	14.3
February 1932	17.8
March 1932	20.1
April 1932	21.7
May 1932	20.7
June 1932	18.9
July 1932	22.6
August 1932	5.59
September 1932	3.57
October 1932	3.32
November 1932	8.25
December 1932	15.5
January 1933	21.0
February 1933	24.7
March 1933	27.0
April 1933	28.9
May 1933	28.8
June 1933	17.5
July 1933	2.93
August 1933	0.339
September 1933	0.0003
October 1933	0
November 1933	1.22
December 1933	8.32
January 1934	14.3
February 1934	18.4
March 1934	20.7
April 1934	21.5
May 1934	14.8
June 1934	6.06
July 1934	0.377
August 1934	0
September 1934	0
October 1934	0.0020
November 1934	3.20
December 1934	9.00
January 1935	13.8
February 1935	17.0
March 1935	19.5
April 1935	21.2
May 1935	21.0
June 1935	33.2
July 1935	29.0
August 1935	6.45
September 1935	1.87
October 1935	1.06
November 1935	5.27
December 1935	10.7
January 1936	16.2
February 1936	20.0
March 1936	22.4
April 1936	24.4
May 1936	23.5
June 1936	28.9
July 1936	10.4
August 1936	1.97
September 1936	3.51
October 1936	1.34
November 1936	4.29
December 1936	12.5
January 1937	18.2
February 1937	22.0
March 1937	24.9
April 1937	26.9
May 1937	26.4
June 1937	17.5
July 1937	7.15
August 1937	0.206
September 1937	0.168
October 1937	0.199
November 1937	2.25
December 1937	8.01
January 1938	13.4
February 1938	17.3
March 1938	20.3
April 1938	22.9
May 1938	33.9
June 1938	47.3
July 1938	48.2
August 1938	37.6
September 1938	36.9
October 1938	39.4
November 1938	43.4
December 1938	43.7
January 1939	46.5
February 1939	47.6
March 1939	47.6
April 1939	48.2
May 1939	47.8
June 1939	42.9
July 1939	29.5
August 1939	13.4
September 1939	10.2
October 1939	8.63
November 1939	12.1
December 1939	19.7
January 1940	25.2
February 1940	29.0
March 1940	31.6
April 1940	32.9
May 1940	31.9
June 1940	31.0
July 1940	19.4
August 1940	3.14
September 1940	4.58
October 1940	11.5
November 1940	18.0
December 1940	24.8
January 1941	30.1
February 1941	33.5
March 1941	35.9
April 1941	37.6
May 1941	39.7
June 1941	49.1
July 1941	42.8
August 1941	28.1
September 1941	27.9
October 1941	32.5
November 1941	36.9
December 1941	42.4
January 1942	44.2
February 1942	43.6
March 1942	42.7
April 1942	46.2
May 1942	47.3
June 1942	46.9
July 1942	43.5
August 1942	23.5
September 1942	19.0
October 1942	22.8
November 1942	30.4
December 1942	36.7
January 1943	39.2
February 1943	40.3
March 1943	40.4
April 1943	40.8
May 1943	45.7
June 1943	45.9
July 1943	47.6
August 1943	41.1
September 1943	31.8
October 1943	34.3
November 1943	41.4
December 1943	44.8
January 1944	43.9
February 1944	46.3
March 1944	47.4
April 1944	47.4
May 1944	47.7
June 1944	49.6
July 1944	46.8
August 1944	38.1
September 1944	22.6
October 1944	30.1
November 1944	39.2
December 1944	43.2
January 1945	44.3
February 1945	44.7
March 1945	45.6
April 1945	46.2
May 1945	47.5
June 1945	48.8
July 1945	45.0
August 1945	25.5
September 1945	13.2
October 1945	19.8
November 1945	27.9
December 1945	35.1
January 1946	40.4
February 1946	44.1
March 1946	46.6
April 1946	47.6
May 1946	48.5
June 1946	47.8
July 1946	38.7
August 1946	16.4
September 1946	13.6
October 1946	24.6
November 1946	35.1
December 1946	43.2
January 1947	46.3
February 1947	46.6
March 1947	46.5
April 1947	45.0
May 1947	47.5
June 1947	48.5
July 1947	35.6
August 1947	16.4
September 1947	8.46
October 1947	11.5
November 1947	22.4
December 1947	30.9
January 1948	37.1
February 1948	41.6
March 1948	45.4
April 1948	46.8
May 1948	44.9
June 1948	47.7
July 1948	41.6
August 1948	20.6
September 1948	8.68
October 1948	16.3
November 1948	26.5
December 1948	34.4
January 1949	40.1
February 1949	43.8
March 1949	46.4
April 1949	46.8
May 1949	42.2
June 1949	45.4
July 1949	28.6
August 1949	7.68
September 1949	0.720
October 1949	4.34
November 1949	14.3
December 1949	22.6
January 1950	28.5
February 1950	32.5
March 1950	35.4
April 1950	37.8
May 1950	33.9
June 1950	34.9
July 1950	33.4
August 1950	8.59
September 1950	2.81
October 1950	12.4
November 1950	21.7
December 1950	29.8
January 1951	36.3
February 1951	40.7
March 1951	44.1
April 1951	47.0
May 1951	49.4
June 1951	49.1
July 1951	47.1
August 1951	43.0
September 1951	34.4
October 1951	36.7
November 1951	44.0
December 1951	47.9
January 1952	47.9
February 1952	46.6
March 1952	44.1
April 1952	41.5
May 1952	44.9
June 1952	47.0
July 1952	47.5
August 1952	30.6
September 1952	24.6
October 1952	31.2
November 1952	38.1
December 1952	44.4
January 1953	46.4
February 1953	45.9
March 1953	46.8
April 1953	47.1
May 1953	42.3
June 1953	42.8
July 1953	44.3
August 1953	24.1
September 1953	11.6
October 1953	14.0
November 1953	22.8
December 1953	30.8
January 1954	37.0
February 1954	41.4
March 1954	44.6
April 1954	46.4
May 1954	40.7
June 1954	44.7
July 1954	41.2
August 1954	19.1
September 1954	8.44
October 1954	4.76
November 1954	8.97
December 1954	17.9
January 1955	24.4
February 1955	28.7
March 1955	31.7
April 1955	33.9
May 1955	33.7
June 1955	28.9
July 1955	26.1
August 1955	12.5
September 1955	1.16
October 1955	0.644
November 1955	5.63
December 1955	14.3
January 1956	21.2
February 1956	26.1
March 1956	29.9
April 1956	34.1
May 1956	44.1
June 1956	49.7
July 1956	43.8
August 1956	21.3
September 1956	12.8
October 1956	14.8
November 1956	23.5
December 1956	30.8
January 1957	36.4
February 1957	40.3
March 1957	43.5
April 1957	45.9
May 1957	47.1
June 1957	52.9
July 1957	50.9
August 1957	21.1
September 1957	16.6
October 1957	21.6
November 1957	28.4
December 1957	34.0
January 1958	38.1
February 1958	40.9
March 1958	43.1
April 1958	44.9
May 1958	41.7
June 1958	47.0
July 1958	41.1
August 1958	20.8
September 1958	12.8
October 1958	4.62
November 1958	13.8
December 1958	23.9
January 1959	31.2
February 1959	36.5
March 1959	40.4
April 1959	43.1
May 1959	34.4
June 1959	20.4
July 1959	16.4
August 1959	1.60
September 1959	0.434

Rate and persistence

-1.03 Mm³

Mean drawdown per month over 12 months

4 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

Mackay Res Nr Mackay ID

Gauge location

Where this comes from

348 monthly observations 1930–1959 Mm³

Spatially aggregatedHigh confidenceSeptember 1959

Source: USGS — National Water Information System, 13126000. 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.