Florence Lk — storage

Storage now, against this reservoir's own record

31.75 Mm³

Stored, September 2025

46th

Percentile among 100 Seps on record

+31.7%

Against the Sep 1991–2020 average

-10.4%

Change over the 12 months to 2025-09

Storage in September 2025 was around the middle of the Sep record, ranked against 100 other Seps held for this reservoir.

Storage, 1925–2025

Monthly mean storage

1,197 monthly values, 1925 to 2025

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	Florence Lk Nr Big C CA (Mm³)
November 1925	0.503
December 1925	0.304
January 1926	0.675
February 1926	0.674
March 1926	0.909
April 1926	2.68
May 1926	29.0
June 1926	42.8
July 1926	40.8
August 1926	28.0
September 1926	1.44
October 1926	0.320
November 1926	0.413
December 1926	0.832
January 1927	0.840
February 1927	1.03
March 1927	0.864
April 1927	0.921
May 1927	1.16
June 1927	13.6
July 1927	75.6
August 1927	72.7
September 1927	47.8
October 1927	24.0
November 1927	18.4
December 1927	0.278
January 1928	0.679
February 1928	0.682
March 1928	0.687
April 1928	0.677
May 1928	28.9
June 1928	77.8
July 1928	74.8
August 1928	48.3
September 1928	12.8
October 1928	0.666
November 1928	0.678
December 1928	0.687
January 1929	0.669
February 1929	0.682
March 1929	0.681
April 1929	0.758
May 1929	10.1
June 1929	55.5
July 1929	78.1
August 1929	60.4
September 1929	25.7
October 1929	1.91
November 1929	0.670
December 1929	0.673
January 1930	0.673
February 1930	0.670
March 1930	0.674
April 1930	0.708
May 1930	5.65
June 1930	60.3
July 1930	76.6
August 1930	52.4
September 1930	18.7
October 1930	0.750
November 1930	0.437
December 1930	0.663
January 1931	0.744
February 1931	0.714
March 1931	0.671
April 1931	0.803
May 1931	7.59
June 1931	5.01
July 1931	0.855
August 1931	0.780
September 1931	0.735
October 1931	0.734
November 1931	0.689
December 1931	0.675
January 1932	0.699
February 1932	0.669
March 1932	0.680
April 1932	0.697
May 1932	2.67
June 1932	50.5
July 1932	80.2
August 1932	76.0
September 1932	55.4
October 1932	18.0
November 1932	0.651
December 1932	0.680
January 1933	0.652
February 1933	0.665
March 1933	0.668
April 1933	0.708
May 1933	1.23
June 1933	39.5
July 1933	78.9
August 1933	72.3
September 1933	46.6
October 1933	10.6
November 1933	0.197
December 1933	0.140
January 1934	0.154
February 1934	0.154
March 1934	0.318
April 1934	3.73
May 1934	38.1
June 1934	39.6
July 1934	5.25
August 1934	0.653
September 1934	0.213
October 1934	0.124
November 1934	0.115
December 1934	0.116
January 1935	0.160
February 1935	0.192
March 1935	0.226
April 1935	0.757
May 1935	4.42
June 1935	60.9
July 1935	79.6
August 1935	73.6
September 1935	53.9
October 1935	18.6
November 1935	0.535
December 1935	0.110
January 1936	0.141
February 1936	0.227
March 1936	2.52
April 1936	5.05
May 1936	24.6
June 1936	62.3
July 1936	79.5
August 1936	75.3
September 1936	47.8
October 1936	12.4
November 1936	0.148
December 1936	0.131
January 1937	0.171
February 1937	0.308
March 1937	0.408
April 1937	0.699
May 1937	35.7
June 1937	79.5
July 1937	79.4
August 1937	73.4
September 1937	63.4
October 1937	64.8
November 1937	46.5
December 1937	0.891
January 1938	0.192
February 1938	0.290
March 1938	0.344
April 1938	1.10
May 1938	7.09
June 1938	65.7
July 1938	73.4
August 1938	79.4
September 1938	75.2
October 1938	75.4
November 1938	76.7
December 1938	66.7
January 1939	8.33
February 1939	0.225
March 1939	0.298
April 1939	2.50
May 1939	36.0
June 1939	75.6
July 1939	75.9
August 1939	75.7
September 1939	76.3
October 1939	76.7
November 1939	76.8
December 1939	48.7
January 1940	2.27
February 1940	0.248
March 1940	0.402
April 1940	0.817
May 1940	21.7
June 1940	75.5
July 1940	79.2
August 1940	67.1
September 1940	33.5
October 1940	5.18
November 1940	0.192
December 1940	0.211
January 1941	0.250
February 1941	0.275
March 1941	0.293
April 1941	0.461
May 1941	15.1
June 1941	68.3
July 1941	78.8
August 1941	79.1
September 1941	64.2
October 1941	36.1
November 1941	15.1
December 1941	3.54
January 1942	0.270
February 1942	0.233
March 1942	0.284
April 1942	0.602
May 1942	1.15
June 1942	38.5
July 1942	79.5
August 1942	78.3
September 1942	58.9
October 1942	23.7
November 1942	0.547
December 1942	0.164
January 1943	0.240
February 1943	0.307
March 1943	0.411
April 1943	0.870
May 1943	6.32
June 1943	37.8
July 1943	72.7
August 1943	75.1
September 1943	48.4
October 1943	22.6
November 1943	0.537
December 1943	0.682
January 1944	0.747
February 1944	0.914
March 1944	0.850
April 1944	0.956
May 1944	6.42
June 1944	51.6
July 1944	78.1
August 1944	69.9
September 1944	38.9
October 1944	9.47
November 1944	0.411
December 1944	0.266
January 1945	0.246
February 1945	0.377
March 1945	0.327
April 1945	1.10
May 1945	5.17
June 1945	30.6
July 1945	78.2
August 1945	74.6
September 1945	55.3
October 1945	62.3
November 1945	77.5
December 1945	55.2
January 1946	0.683
February 1946	0.298
March 1946	0.435
April 1946	2.71
May 1946	39.6
June 1946	64.9
July 1946	79.0
August 1946	72.4
September 1946	47.2
October 1946	28.0
November 1946	8.29
December 1946	0.626
January 1947	0.295
February 1947	0.309
March 1947	0.379
April 1947	0.769
May 1947	28.7
June 1947	64.1
July 1947	75.3
August 1947	49.7
September 1947	17.1
October 1947	0.628
November 1947	0.405
December 1947	0.247
January 1948	0.233
February 1948	0.230
March 1948	0.265
April 1948	0.508
May 1948	10.1
June 1948	53.9
July 1948	77.6
August 1948	60.1
September 1948	32.9
October 1948	10.1
November 1948	0.597
December 1948	0.230
March 1949	0.291
April 1949	1.17
May 1949	11.5
June 1949	54.4
July 1949	77.1
August 1949	57.9
September 1949	44.9
October 1949	45.6
November 1949	8.14
December 1949	0.235
January 1950	0.281
February 1950	0.336
March 1950	0.353
April 1950	1.61
May 1950	15.3
June 1950	62.5
July 1950	77.7
August 1950	58.8
September 1950	25.9
October 1950	2.38
November 1950	3.53
December 1950	5.94
January 1951	0.409
February 1951	0.405
March 1951	0.428
April 1951	0.856
May 1951	9.23
June 1951	65.3
July 1951	79.2
August 1951	66.5
September 1951	35.1
October 1951	8.58
November 1951	0.380
December 1951	0.378
January 1952	0.411
February 1952	0.380
March 1952	0.438
April 1952	3.48
May 1952	18.6
June 1952	67.6
July 1952	76.3
August 1952	78.9
September 1952	67.3
October 1952	41.2
November 1952	8.12
December 1952	0.372
January 1953	0.399
February 1953	0.375
March 1953	0.392
April 1953	1.08
May 1953	13.8
June 1953	40.1
July 1953	77.4
August 1953	69.1
September 1953	40.1
October 1953	12.7
November 1953	0.795
December 1953	0.325
January 1954	0.316
February 1954	0.398
March 1954	0.481
April 1954	0.995
May 1954	23.4
June 1954	59.1
July 1954	78.3
August 1954	66.2
September 1954	38.8
October 1954	15.0
November 1954	0.789
December 1954	0.396
January 1955	0.412
February 1955	0.430
March 1955	0.467
April 1955	0.569
May 1955	4.69
June 1955	51.5
July 1955	64.6
August 1955	73.3
September 1955	71.5
October 1955	49.0
November 1955	16.8
December 1955	4.79
January 1956	8.76
February 1956	0.520
March 1956	0.746
April 1956	0.953
May 1956	4.59
June 1956	59.4
July 1956	78.5
August 1956	71.0
September 1956	51.8
October 1956	53.2
November 1956	13.1
December 1956	1.38
January 1957	0.429
February 1957	0.536
March 1957	0.701
April 1957	1.66
May 1957	6.17
June 1957	52.3
July 1957	75.0
August 1957	68.5
September 1957	53.7
October 1957	27.9
November 1957	18.9
December 1957	16.1
January 1958	0.413
February 1958	0.449
March 1958	0.470
April 1958	0.828
May 1958	18.9
June 1958	74.6
July 1958	78.9
August 1958	76.7
September 1958	52.4
October 1958	14.1
November 1958	0.369
December 1958	0.346
January 1959	0.376
February 1959	0.436
March 1959	0.524
April 1959	0.874
May 1959	10.5
June 1959	35.3
July 1959	38.5
August 1959	37.1
September 1959	7.64
October 1959	0.413
November 1959	0.372
December 1959	0.293
January 1960	0.307
February 1960	0.360
March 1960	0.424
April 1960	1.04
May 1960	12.9
June 1960	49.8
July 1960	42.6
August 1960	24.6
September 1960	1.19
October 1960	0.623
November 1960	0.319
December 1960	0.323
January 1961	0.293
February 1961	0.317
March 1961	0.346
April 1961	0.630
May 1961	5.78
June 1961	31.5
July 1961	22.3
August 1961	0.903
September 1961	0.520
October 1961	0.326
November 1961	0.316
December 1961	0.333
January 1962	0.336
February 1962	0.477
March 1962	0.692
April 1962	1.23
May 1962	2.77
June 1962	37.3
July 1962	73.1
August 1962	62.7
September 1962	36.9
October 1962	6.12
November 1962	0.285
December 1962	0.272
January 1963	0.305
February 1963	2.44
March 1963	0.436
April 1963	0.514
May 1963	3.34
June 1963	37.7
July 1963	79.0
August 1963	71.2
September 1963	47.8
October 1963	25.2
November 1963	1.96
December 1963	0.371
January 1964	0.329
February 1964	0.332
March 1964	0.354
April 1964	0.551
May 1964	11.0
June 1964	47.5
July 1964	48.2
August 1964	32.7
September 1964	9.16
October 1964	0.325
November 1964	2.15
December 1964	5.64
January 1965	1.52
February 1965	0.446
March 1965	0.451
April 1965	0.770
May 1965	2.54
June 1965	29.5
July 1965	69.6
August 1965	72.4
September 1965	41.9
October 1965	8.56
November 1965	0.447
December 1965	0.871
January 1966	0.438
February 1966	0.412
March 1966	0.513
April 1966	1.69
May 1966	33.0
June 1966	69.1
July 1966	72.1
August 1966	53.4
September 1966	24.5
October 1966	1.41
November 1966	0.358
December 1966	1.17
January 1967	0.473
February 1967	0.531
March 1967	0.583
April 1967	0.505
May 1967	9.22
June 1967	47.3
July 1967	74.6
August 1967	78.2
September 1967	67.1
October 1967	38.1
November 1967	12.1
December 1967	0.409
January 1968	0.399
February 1968	0.445
March 1968	0.468
April 1968	0.778
May 1968	20.7
June 1968	58.2
July 1968	47.3
August 1968	27.3
September 1968	6.78
October 1968	0.944
November 1968	0.522
December 1968	0.451
January 1969	1.72
February 1969	1.16
March 1969	0.655
April 1969	1.07
May 1969	38.9
June 1969	69.2
July 1969	75.0
August 1969	77.7
September 1969	59.3
October 1969	30.7
November 1969	2.98
December 1969	0.641
January 1970	0.455
February 1970	0.441
March 1970	0.505
April 1970	0.620
May 1970	14.3
June 1970	60.4
July 1970	76.3
August 1970	60.6
September 1970	43.6
October 1970	7.04
November 1970	0.362
December 1970	0.442
January 1971	0.458
February 1971	0.451
March 1971	0.472
April 1971	0.638
May 1971	6.88
June 1971	46.4
July 1971	76.7
August 1971	62.8
September 1971	58.1
October 1971	60.3
November 1971	56.4
December 1971	29.1
January 1972	2.18
February 1972	0.392
March 1972	0.546
April 1972	0.546
May 1972	17.3
June 1972	68.0
July 1972	66.0
August 1972	46.5
September 1972	38.8
October 1972	22.0
November 1972	3.32
December 1972	0.412
January 1973	0.421
February 1973	0.454
March 1973	0.449
April 1973	0.752
May 1973	21.3
June 1973	76.0
July 1973	73.8
August 1973	59.9
September 1973	47.5
October 1973	18.6
November 1973	1.25
December 1973	0.443
January 1974	0.475
February 1974	0.435
March 1974	0.514
April 1974	0.705
May 1974	13.4
June 1974	63.3
July 1974	78.5
August 1974	69.1
September 1974	46.4
October 1974	15.0
November 1974	0.573
December 1974	0.345
January 1975	0.351
February 1975	0.395
March 1975	0.440
April 1975	0.470
May 1975	4.37
June 1975	62.1
July 1975	75.3
August 1975	63.9
September 1975	47.6
October 1975	17.4
November 1975	1.25
December 1975	0.331
January 1976	0.310
February 1976	0.319
March 1976	0.354
April 1976	0.445
May 1976	8.81
June 1976	14.8
July 1976	12.5
August 1976	12.0
September 1976	5.12
October 1976	0.431
November 1976	0.332
December 1976	0.306
January 1977	0.316
February 1977	0.323
March 1977	0.333
April 1977	0.707
May 1977	0.647
June 1977	20.8
July 1977	14.3
August 1977	0.463
September 1977	0.463
October 1977	0.463
November 1977	0.463
December 1977	0.435
January 1978	0.394
February 1978	0.396
March 1978	0.480
April 1978	0.645
May 1978	6.51
June 1978	63.2
July 1978	78.4
August 1978	79.1
September 1978	77.1
October 1978	54.5
November 1978	22.3
December 1978	1.78
January 1979	1.47
February 1979	1.44
March 1979	1.53
April 1979	1.71
May 1979	11.7
June 1979	71.0
July 1979	78.0
August 1979	63.9
September 1979	35.1
October 1979	7.42
November 1979	1.45
December 1979	1.44
January 1980	1.88
February 1980	1.53
March 1980	1.57
April 1980	2.24
May 1980	20.2
June 1980	67.2
July 1980	79.6
August 1980	78.4
September 1980	60.9
October 1980	27.8
November 1980	1.79
December 1980	1.09
January 1981	1.07
February 1981	1.15
March 1981	1.16
April 1981	2.39
May 1981	33.7
June 1981	76.5
July 1981	71.2
August 1981	41.9
September 1981	30.4
October 1981	14.3
November 1981	1.23
December 1981	1.18
January 1982	1.23
February 1982	1.26
March 1982	1.24
April 1982	5.86
May 1982	46.9
June 1982	78.5
July 1982	79.3
August 1982	78.2
September 1982	74.6
October 1982	56.7
November 1982	39.8
December 1982	5.52
January 1983	1.24
February 1983	1.23
March 1983	1.26
April 1983	3.60
May 1983	24.2
June 1983	70.3
July 1983	74.0
August 1983	78.3
September 1983	58.5
October 1983	22.3
November 1983	1.69
December 1983	1.60
January 1984	1.49
February 1984	1.47
March 1984	1.56
April 1984	1.71
May 1984	22.4
June 1984	75.3
July 1984	78.5
August 1984	76.8
September 1984	63.8
October 1984	49.0
November 1984	35.6
December 1984	6.48
January 1985	1.44
February 1985	1.45
March 1985	1.48
April 1985	5.89
May 1985	26.5
June 1985	67.5
July 1985	69.5
August 1985	48.9
September 1985	28.0
October 1985	8.33
November 1985	1.40
December 1985	1.47
January 1986	1.47
February 1986	1.68
March 1986	1.73
April 1986	2.41
May 1986	18.8
June 1986	77.3
July 1986	79.6
August 1986	70.9
September 1986	52.6
October 1986	30.2
November 1986	6.82
December 1986	1.30
January 1987	1.31
February 1987	1.38
March 1987	1.43
April 1987	2.37
May 1987	27.8
June 1987	60.5
July 1987	60.5
August 1987	34.5
September 1987	10.6
October 1987	1.34
November 1987	1.36
December 1987	1.36
January 1988	1.44
February 1988	1.45
March 1988	1.50
April 1988	1.94
May 1988	15.8
June 1988	53.6
July 1988	47.9
August 1988	28.7
September 1988	17.3
October 1988	2.69
November 1988	1.32
December 1988	1.33
January 1989	1.34
February 1989	1.36
March 1989	1.52
April 1989	9.38
May 1989	27.7
June 1989	49.1
July 1989	54.4
August 1989	40.3
September 1989	8.15
October 1989	1.31
November 1989	1.33
December 1989	1.32
January 1990	1.32
February 1990	1.35
March 1990	1.47
April 1990	2.17
May 1990	22.8
June 1990	45.2
July 1990	31.1
August 1990	5.63
September 1990	1.29
October 1990	1.27
November 1990	1.27
December 1990	1.27
January 1991	1.28
February 1991	1.33
March 1991	3.33
April 1991	8.38
May 1991	23.1
June 1991	57.9
July 1991	66.7
August 1991	46.0
September 1991	21.1
October 1991	8.37
November 1991	1.38
December 1991	1.33
January 1992	1.35
February 1992	1.40
March 1992	1.44
April 1992	2.30
May 1992	32.3
June 1992	56.1
July 1992	49.7
August 1992	34.5
September 1992	22.4
October 1992	6.53
November 1992	1.37
December 1992	1.36
January 1993	1.55
February 1993	1.48
March 1993	1.62
April 1993	1.82
May 1993	10.9
June 1993	60.2
July 1993	78.7
August 1993	67.0
September 1993	28.7
October 1993	2.26
November 1993	1.32
December 1993	1.34
January 1994	1.33
February 1994	1.35
March 1994	1.49
April 1994	2.79
May 1994	13.2
June 1994	58.3
July 1994	48.4
August 1994	13.8
September 1994	1.32
October 1994	1.47
November 1994	1.42
December 1994	1.41
January 1995	1.51
February 1995	1.51
March 1995	1.66
April 1995	1.71
May 1995	3.15
June 1995	40.1
July 1995	76.4
August 1995	78.4
September 1995	64.3
October 1995	31.1
November 1995	2.01
December 1995	1.95
January 1996	1.65
February 1996	5.29
March 1996	1.89
April 1996	2.50
May 1996	29.3
June 1996	75.1
July 1996	79.4
August 1996	60.0
September 1996	8.41
October 1996	1.31
November 1996	1.43
December 1996	1.73
January 1997	25.1
February 1997	38.5
March 1997	38.5
April 1997	31.0
May 1997	54.3
June 1997	78.6
July 1997	76.9
August 1997	53.1
September 1997	27.4
October 1997	13.2
November 1997	1.35
December 1997	1.41
January 1998	1.43
February 1998	1.50
March 1998	1.56
April 1998	1.66
May 1998	3.27
June 1998	44.6
July 1998	71.5
August 1998	76.5
September 1998	42.5
October 1998	3.53
November 1998	1.37
December 1998	1.37
January 1999	1.35
February 1999	1.44
March 1999	1.45
April 1999	1.59
May 1999	14.7
June 1999	67.9
July 1999	75.4
August 1999	51.1
September 1999	18.9
October 1999	4.61
November 1999	1.30
December 1999	1.23
January 2000	1.29
February 2000	1.44
March 2000	1.50
April 2000	1.84
May 2000	21.5
June 2000	74.2
July 2000	71.5
August 2000	51.1
September 2000	36.5
October 2000	28.5
November 2000	22.0
December 2000	3.67
January 2001	1.39
February 2001	1.54
March 2001	1.66
April 2001	1.88
May 2001	42.1
June 2001	68.8
July 2001	60.3
August 2001	52.2
September 2001	32.2
October 2001	5.50
November 2001	1.77
December 2001	2.46
January 2002	1.61
February 2002	1.48
March 2002	1.48
April 2002	7.78
May 2002	33.0
June 2002	68.2
July 2002	73.4
August 2002	46.2
September 2002	18.9
October 2002	5.01
November 2002	1.43
December 2002	1.37
January 2003	1.42
February 2003	1.42
March 2003	1.51
April 2003	1.61
May 2003	9.91
June 2003	73.4
July 2003	55.4
August 2003	42.6
September 2003	20.6
October 2003	3.24
November 2003	1.33
December 2003	1.38
January 2004	1.43
February 2004	1.45
March 2004	1.74
April 2004	3.71
May 2004	43.2
June 2004	70.5
July 2004	67.3
August 2004	47.7
September 2004	22.8
October 2004	2.04
November 2004	1.65
December 2004	4.36
January 2005	3.99
February 2005	1.47
March 2005	1.58
April 2005	1.73
May 2005	18.0
June 2005	72.4
July 2005	76.6
August 2005	65.1
September 2005	30.5
October 2005	17.3
November 2005	2.09
December 2005	1.47
January 2006	1.52
February 2006	1.52
March 2006	1.56
April 2006	1.99
May 2006	39.5
June 2006	73.9
July 2006	76.8
August 2006	54.9
September 2006	10.4
October 2006	0.544
November 2006	0.621
December 2006	1.19
January 2007	1.37
February 2007	1.39
March 2007	1.55
April 2007	1.77
May 2007	25.1
June 2007	57.5
July 2007	34.3
August 2007	16.6
September 2007	15.7
October 2007	5.41
November 2007	2.78
December 2007	1.33
January 2008	1.40
February 2008	1.60
March 2008	1.56
April 2008	2.71
May 2008	30.1
June 2008	63.7
July 2008	75.5
August 2008	62.1
September 2008	32.9
October 2008	20.2
November 2008	6.35
December 2008	1.35
January 2009	1.44
February 2009	1.47
March 2009	1.56
April 2009	2.20
May 2009	37.8
June 2009	73.5
July 2009	62.4
August 2009	31.1
September 2009	10.4
October 2009	2.68
November 2009	6.13
December 2009	7.25
January 2010	10.2
February 2010	11.1
March 2010	5.59
April 2010	6.07
May 2010	22.8
June 2010	68.1
July 2010	71.2
August 2010	62.3
September 2010	50.1
October 2010	43.3
November 2010	49.8
December 2010	47.5
January 2011	49.0
February 2011	35.8
March 2011	25.7
April 2011	40.7
May 2011	40.0
June 2011	58.5
July 2011	76.8
August 2011	69.1
September 2011	65.0
October 2011	62.4
November 2011	61.3
December 2011	47.3
January 2012	45.8
February 2012	28.6
March 2012	16.4
April 2012	8.92
May 2012	47.9
June 2012	62.7
July 2012	50.5
August 2012	35.0
September 2012	9.77
October 2012	2.55
November 2012	3.13
December 2012	6.62
January 2013	7.41
February 2013	9.04
March 2013	4.08
April 2013	15.8
May 2013	50.2
June 2013	67.5
July 2013	52.5
August 2013	29.4
September 2013	9.37
October 2013	6.16
November 2013	6.27
December 2013	6.52
January 2014	6.59
February 2014	6.66
March 2014	6.55
April 2014	12.5
May 2014	40.3
June 2014	57.9
July 2014	44.8
August 2014	31.3
September 2014	12.6
October 2014	3.59
November 2014	3.48
December 2014	4.10
January 2015	4.97
February 2015	6.57
March 2015	9.49
April 2015	15.0
May 2015	30.3
June 2015	30.8
July 2015	26.6
August 2015	26.3
September 2015	18.7
October 2015	17.9
November 2015	7.43
December 2015	4.59
January 2016	4.99
February 2016	8.24
March 2016	16.8
April 2016	31.7
May 2016	59.6
June 2016	73.6
July 2016	57.5
August 2016	27.1
September 2016	13.0
October 2016	5.29
November 2016	12.6
December 2016	11.9
January 2017	11.5
February 2017	10.7
March 2017	9.08
April 2017	12.4
May 2017	40.1
June 2017	70.1
July 2017	64.2
August 2017	19.2
September 2017	1.48
October 2017	1.36
November 2017	1.39
December 2017	1.36
January 2018	1.39
February 2018	1.36
March 2018	2.72
April 2018	32.9
May 2018	72.0
June 2018	75.9
July 2018	62.5
August 2018	41.1
September 2018	14.9
October 2018	1.37
November 2018	1.33
December 2018	1.40
January 2019	1.44
February 2019	1.57
March 2019	1.55
April 2019	3.09
May 2019	20.4
June 2019	61.1
July 2019	73.7
August 2019	49.5
September 2019	40.1
October 2019	41.1
November 2019	34.7
December 2019	7.58
January 2020	7.47
February 2020	5.52
March 2020	7.30
April 2020	14.3
May 2020	54.8
June 2020	72.4
July 2020	59.5
August 2020	38.6
September 2020	22.3
October 2020	17.3
November 2020	13.9
December 2020	6.29
January 2021	6.24
February 2021	7.21
March 2021	7.63
April 2021	11.4
May 2021	37.2
June 2021	45.8
July 2021	44.5
August 2021	33.9
September 2021	11.7
October 2021	2.18
November 2021	7.56
December 2021	6.06
January 2022	7.27
February 2022	5.14
March 2022	4.20
April 2022	11.1
May 2022	32.5
June 2022	66.1
July 2022	54.8
August 2022	49.8
September 2022	13.5
October 2022	1.44
November 2022	2.18
December 2022	5.40
January 2023	17.3
February 2023	19.2
March 2023	15.6
April 2023	13.4
May 2023	30.9
June 2023	70.1
July 2023	69.8
August 2023	69.3
September 2023	71.0
October 2023	56.7
November 2023	20.5
December 2023	20.0
January 2024	14.6
February 2024	9.78
March 2024	7.28
April 2024	11.1
May 2024	34.8
June 2024	74.4
July 2024	71.8
August 2024	54.2
September 2024	35.4
October 2024	33.7
November 2024	21.1
December 2024	6.07
January 2025	6.97
February 2025	7.24
March 2025	7.57
April 2025	14.3
May 2025	35.5
June 2025	73.6
July 2025	71.3
August 2025	48.3
September 2025	31.8

The reservoir's year

Seasonal storage profile

Each calendar month's reference average, against the most recent year

1991–2020 average
Most recent 12 months

Twelve separate averages, one per calendar month. A January average describes Januaries only. Months are plotted 1–12.

View the data behind this chart

Underlying data
Period	1991–2020 average (Mm³)	Most recent 12 months (Mm³)
Jan	6.80	6.97
Feb	6.46	7.24
Mar	5.79	7.57
Apr	9.14	14.3
May	32.1	35.5
Jun	64.5	73.6
Jul	63.9	71.3
Aug	46.0	48.3
Sep	24.1	31.8
Oct	12.2	33.7
Nov	8.48	21.1
Dec	6.14	6.07

Rate and persistence

-0.31 Mm³

Mean drawdown per month over 12 months

0 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

Florence Lk Nr Big C CA

Gauge location

Where this comes from

1,197 monthly observations 1925–2025 Mm³

Spatially aggregatedHigh confidenceSeptember 2025

Source: USGS — National Water Information System, 11229600. 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.