Shaver Lk — storage

Storage now, against this reservoir's own record

114.75 Mm³

Stored, September 2025

58th

Percentile among 99 Seps on record

-9.6%

Against the Sep 1991–2020 average

+10.7%

Change over the 12 months to 2025-09

Storage in September 2025 was around the middle of the Sep record, ranked against 99 other Seps held for this reservoir.

Storage, 1927–2025

Monthly mean storage

1,185 monthly values, 1927 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	Shaver Lk Nr Big C CA (Mm³)
January 1927	1.26
February 1927	1.56
March 1927	1.28
April 1927	2.08
May 1927	5.24
June 1927	6.07
July 1927	5.66
August 1927	4.89
September 1927	4.33
October 1927	3.92
November 1927	5.59
December 1927	4.67
January 1928	3.73
February 1928	2.42
March 1928	7.08
April 1928	20.5
May 1928	45.7
June 1928	71.8
July 1928	72.9
August 1928	68.4
September 1928	55.3
October 1928	45.0
November 1928	38.2
December 1928	34.7
January 1929	19.1
February 1929	15.1
March 1929	14.7
April 1929	19.5
May 1929	31.4
June 1929	65.5
July 1929	86.8
August 1929	46.9
September 1929	21.2
October 1929	17.8
November 1929	17.2
December 1929	16.2
January 1930	16.4
February 1930	17.4
March 1930	20.1
April 1930	33.1
May 1930	50.6
June 1930	105
July 1930	108
August 1930	64.0
September 1930	29.2
October 1930	18.6
November 1930	14.4
December 1930	12.9
January 1931	10.7
February 1931	11.3
March 1931	12.1
April 1931	13.9
May 1931	17.2
June 1931	18.4
July 1931	10.2
August 1931	6.56
September 1931	6.38
October 1931	6.40
November 1931	6.60
December 1931	7.57
January 1932	10.0
February 1932	11.3
March 1932	9.06
April 1932	14.8
May 1932	53.5
June 1932	149
July 1932	167
August 1932	157
September 1932	120
October 1932	98.4
November 1932	83.6
December 1932	74.3
January 1933	60.5
February 1933	51.1
March 1933	39.9
April 1933	38.1
May 1933	49.5
June 1933	109
July 1933	144
August 1933	120
September 1933	79.5
October 1933	62.3
November 1933	61.7
December 1933	54.7
January 1934	43.1
February 1934	28.6
March 1934	26.9
April 1934	33.9
May 1934	37.8
June 1934	36.5
July 1934	24.1
August 1934	8.92
September 1934	6.13
October 1934	6.19
November 1934	6.87
December 1934	8.17
January 1935	8.25
February 1935	5.03
March 1935	2.07
April 1935	12.2
May 1935	65.4
June 1935	151
July 1935	165
August 1935	135
September 1935	95.1
October 1935	65.1
November 1935	42.0
December 1935	31.4
January 1936	25.7
February 1936	29.0
March 1936	26.3
April 1936	19.8
May 1936	70.2
June 1936	153
July 1936	167
August 1936	148
September 1936	104
October 1936	71.0
November 1936	55.6
December 1936	42.0
January 1937	32.4
February 1937	16.6
March 1937	11.3
April 1937	9.97
May 1937	70.8
June 1937	152
July 1937	166
August 1937	143
September 1937	101
October 1937	74.0
November 1937	48.9
December 1937	45.4
January 1938	43.4
February 1938	35.3
March 1938	44.3
April 1938	44.4
May 1938	54.4
June 1938	144
July 1938	165
August 1938	165
September 1938	147
October 1938	124
November 1938	103
December 1938	83.8
January 1939	68.0
February 1939	51.8
March 1939	51.3
April 1939	61.9
May 1939	79.8
June 1939	90.5
July 1939	74.5
August 1939	44.6
September 1939	23.1
October 1939	20.4
November 1939	18.6
December 1939	17.5
January 1940	21.0
February 1940	23.1
March 1940	23.6
April 1940	35.7
May 1940	112
June 1940	166
July 1940	162
August 1940	127
September 1940	90.3
October 1940	72.3
November 1940	57.3
December 1940	42.2
January 1941	38.4
February 1941	29.7
March 1941	29.9
April 1941	33.2
May 1941	62.7
June 1941	149
July 1941	166
August 1941	161
September 1941	129
October 1941	97.2
November 1941	76.2
December 1941	62.1
January 1942	41.3
February 1942	18.0
March 1942	14.8
April 1942	24.6
May 1942	51.0
June 1942	129
July 1942	167
August 1942	148
September 1942	106
October 1942	75.3
November 1942	60.2
December 1942	49.4
January 1943	44.3
February 1943	39.0
March 1943	26.3
April 1943	27.5
May 1943	86.3
June 1943	141
July 1943	148
August 1943	131
September 1943	100
October 1943	77.2
November 1943	58.9
December 1943	45.0
January 1944	38.7
February 1944	37.8
March 1944	38.8
April 1944	41.1
May 1944	79.2
June 1944	151
July 1944	163
August 1944	138
September 1944	103
October 1944	73.1
November 1944	52.4
December 1944	32.4
January 1945	17.2
February 1945	27.0
March 1945	20.3
April 1945	9.04
May 1945	60.1
June 1945	137
July 1945	167
August 1945	160
September 1945	132
October 1945	100
November 1945	78.9
December 1945	51.7
January 1946	33.4
February 1946	25.4
March 1946	28.2
April 1946	43.1
May 1946	108
June 1946	163
July 1946	165
August 1946	144
September 1946	112
October 1946	88.3
November 1946	66.1
December 1946	46.9
January 1947	24.4
February 1947	15.1
March 1947	12.9
April 1947	12.8
May 1947	62.3
June 1947	116
July 1947	109
August 1947	92.8
September 1947	74.4
October 1947	56.8
November 1947	44.5
December 1947	37.2
January 1948	32.2
February 1948	31.6
March 1948	32.2
April 1948	37.7
May 1948	77.2
June 1948	150
July 1948	163
August 1948	149
September 1948	121
October 1948	91.8
November 1948	67.9
December 1948	52.5
January 1949	46.3
February 1949	43.3
March 1949	37.0
April 1949	25.2
May 1949	90.8
June 1949	132
July 1949	120
August 1949	98.8
September 1949	83.2
October 1949	74.7
November 1949	72.1
December 1949	62.3
January 1950	55.2
February 1950	43.1
March 1950	31.5
April 1950	36.1
May 1950	97.0
June 1950	146
July 1950	144
August 1950	123
September 1950	97.2
October 1950	76.3
November 1950	65.1
December 1950	83.1
January 1951	66.1
February 1951	50.3
March 1951	23.7
April 1951	37.5
May 1951	102
June 1951	159
July 1951	164
August 1951	136
September 1951	112
October 1951	88.0
November 1951	68.6
December 1951	51.6
January 1952	34.7
February 1952	25.0
March 1952	21.5
April 1952	9.09
May 1952	56.2
June 1952	142
July 1952	166
August 1952	159
September 1952	126
October 1952	91.1
November 1952	69.7
December 1952	54.6
January 1953	38.0
February 1953	34.2
March 1953	33.6
April 1953	36.4
May 1953	65.3
June 1953	125
July 1953	156
August 1953	133
September 1953	107
October 1953	88.2
November 1953	71.7
December 1953	55.9
January 1954	47.8
February 1954	47.2
March 1954	41.8
April 1954	36.8
May 1954	110
June 1954	155
July 1954	150
August 1954	128
September 1954	107
October 1954	89.3
November 1954	74.4
December 1954	54.9
January 1955	38.0
February 1955	33.1
March 1955	31.3
April 1955	27.6
May 1955	45.7
June 1955	116
July 1955	140
August 1955	142
September 1955	128
October 1955	111
November 1955	90.0
December 1955	80.6
January 1956	77.2
February 1956	62.2
March 1956	36.6
April 1956	28.2
May 1956	59.4
June 1956	122
July 1956	166
August 1956	167
September 1956	157
October 1956	118
November 1956	87.9
December 1956	65.8
January 1957	44.3
February 1957	37.9
March 1957	25.7
April 1957	17.8
May 1957	45.2
June 1957	124
July 1957	142
August 1957	118
September 1957	90.9
October 1957	72.6
November 1957	65.9
December 1957	50.7
January 1958	29.3
February 1958	24.8
March 1958	19.3
April 1958	13.7
May 1958	57.4
June 1958	138
July 1958	167
August 1958	166
September 1958	156
October 1958	124
November 1958	90.2
December 1958	52.9
January 1959	33.9
February 1959	29.2
March 1959	23.9
April 1959	26.3
May 1959	39.5
June 1959	41.7
July 1959	38.5
August 1959	29.6
September 1959	29.3
October 1959	30.1
November 1959	33.9
December 1959	31.5
January 1960	30.1
February 1960	28.1
March 1960	25.7
April 1960	30.6
May 1960	48.3
June 1960	57.4
July 1960	36.0
August 1960	19.4
September 1960	17.2
October 1960	13.1
November 1960	13.4
December 1960	16.0
January 1961	16.4
February 1961	17.4
March 1961	18.9
April 1961	23.9
May 1961	30.3
June 1961	32.2
July 1961	25.2
August 1961	17.5
September 1961	16.6
October 1961	13.2
November 1961	12.8
December 1961	22.6
January 1962	20.6
February 1962	21.3
March 1962	27.9
April 1962	32.0
May 1962	91.4
June 1962	136
July 1962	159
August 1962	140
September 1962	112
October 1962	88.3
November 1962	72.1
December 1962	64.4
January 1963	61.8
February 1963	66.7
March 1963	59.2
April 1963	73.4
May 1963	108
June 1963	158
July 1963	167
August 1963	165
September 1963	146
October 1963	112
November 1963	82.0
December 1963	49.3
January 1964	45.6
February 1964	47.5
March 1964	49.1
April 1964	55.0
May 1964	65.3
June 1964	69.1
July 1964	53.1
August 1964	33.7
September 1964	19.5
October 1964	28.0
November 1964	31.9
December 1964	35.3
January 1965	42.1
February 1965	36.7
March 1965	33.0
April 1965	18.3
May 1965	62.7
June 1965	150
July 1965	166
August 1965	162
September 1965	156
October 1965	119
November 1965	89.3
December 1965	65.4
January 1966	40.0
February 1966	35.1
March 1966	28.2
April 1966	47.1
May 1966	102
June 1966	122
July 1966	114
August 1966	101
September 1966	93.0
October 1966	86.9
November 1966	75.6
December 1966	75.0
January 1967	45.0
February 1967	33.2
March 1967	40.9
April 1967	45.8
May 1967	28.6
June 1967	91.3
July 1967	157
August 1967	166
September 1967	153
October 1967	124
November 1967	97.2
December 1967	63.4
January 1968	34.2
February 1968	29.6
March 1968	32.1
April 1968	38.4
May 1968	45.5
June 1968	47.1
July 1968	33.8
August 1968	18.8
September 1968	14.2
October 1968	12.3
November 1968	13.5
December 1968	15.2
January 1969	25.7
February 1969	44.9
March 1969	34.2
April 1969	11.2
May 1969	60.6
June 1969	140
July 1969	165
August 1969	167
September 1969	156
October 1969	147
November 1969	140
December 1969	105
January 1970	80.0
February 1970	82.6
March 1970	67.0
April 1970	66.5
May 1970	88.7
June 1970	149
July 1970	149
August 1970	116
September 1970	95.9
October 1970	89.9
November 1970	82.8
December 1970	73.7
January 1971	54.1
February 1971	46.8
March 1971	43.3
April 1971	62.2
May 1971	85.7
June 1971	133
July 1971	161
August 1971	133
September 1971	93.8
October 1971	79.8
November 1971	76.5
December 1971	62.4
January 1972	50.5
February 1972	49.0
March 1972	55.5
April 1972	64.6
May 1972	74.7
June 1972	87.4
July 1972	78.9
August 1972	69.3
September 1972	67.2
October 1972	64.6
November 1972	54.9
December 1972	39.3
January 1973	35.5
February 1973	27.1
March 1973	28.3
April 1973	22.9
May 1973	74.1
June 1973	155
July 1973	166
August 1973	149
September 1973	128
October 1973	111
November 1973	94.6
December 1973	75.9
January 1974	67.0
February 1974	56.0
March 1974	53.4
April 1974	46.2
May 1974	72.2
June 1974	141
July 1974	162
August 1974	148
September 1974	113
October 1974	90.9
November 1974	75.8
December 1974	62.9
January 1975	57.1
February 1975	57.3
March 1975	51.7
April 1975	32.5
May 1975	39.0
June 1975	114
July 1975	151
August 1975	136
September 1975	115
October 1975	99.3
November 1975	83.3
December 1975	63.9
January 1976	57.7
February 1976	50.3
March 1976	49.7
April 1976	53.2
May 1976	60.1
June 1976	62.1
July 1976	59.6
August 1976	50.4
September 1976	40.3
October 1976	34.0
November 1976	33.3
December 1976	33.4
January 1977	33.9
February 1977	34.3
March 1977	35.2
April 1977	36.6
May 1977	39.0
June 1977	41.1
July 1977	39.2
August 1977	36.8
September 1977	35.5
October 1977	35.2
November 1977	35.2
December 1977	36.6
January 1978	44.6
February 1978	52.8
March 1978	40.3
April 1978	16.2
May 1978	29.4
June 1978	110
July 1978	164
August 1978	164
September 1978	162
October 1978	148
November 1978	127
December 1978	101
January 1979	81.2
February 1979	71.0
March 1979	69.7
April 1979	80.1
May 1979	121
June 1979	163
July 1979	159
August 1979	134
September 1979	115
October 1979	98.8
November 1979	88.1
December 1979	82.6
January 1980	87.5
February 1980	83.3
March 1980	103
April 1980	88.6
May 1980	112
June 1980	155
July 1980	167
August 1980	159
September 1980	123
October 1980	98.5
November 1980	85.5
December 1980	75.8
January 1981	72.7
February 1981	75.3
March 1981	78.4
April 1981	85.9
May 1981	101
June 1981	139
July 1981	145
August 1981	122
September 1981	96.9
October 1981	86.4
November 1981	87.4
December 1981	89.7
January 1982	90.6
February 1982	68.2
March 1982	67.3
April 1982	103
May 1982	131
June 1982	154
July 1982	166
August 1982	166
September 1982	153
October 1982	164
November 1982	166
December 1982	163
January 1983	135
February 1983	115
March 1983	114
April 1983	91.4
May 1983	74.5
June 1983	119
July 1983	160
August 1983	167
September 1983	167
October 1983	150
November 1983	114
December 1983	92.3
January 1984	81.7
February 1984	70.7
March 1984	61.0
April 1984	48.9
May 1984	78.9
June 1984	137
July 1984	156
August 1984	140
September 1984	104
October 1984	67.9
November 1984	55.6
December 1984	63.2
January 1985	58.7
February 1985	50.3
March 1985	57.5
April 1985	64.6
May 1985	93.6
June 1985	98.5
July 1985	93.5
August 1985	82.4
September 1985	65.6
October 1985	49.5
November 1985	34.9
December 1985	31.1
January 1986	31.7
February 1986	44.6
March 1986	88.8
April 1986	110
May 1986	139
June 1986	166
July 1986	167
August 1986	159
September 1986	126
October 1986	89.1
November 1986	80.9
December 1986	80.8
January 1987	81.4
February 1987	82.2
March 1987	79.8
April 1987	75.3
May 1987	71.9
June 1987	61.5
July 1987	52.8
August 1987	43.8
September 1987	30.9
October 1987	20.2
November 1987	15.6
December 1987	14.8
January 1988	14.5
February 1988	15.8
March 1988	23.5
April 1988	31.8
May 1988	37.8
June 1988	44.1
July 1988	40.0
August 1988	32.0
September 1988	26.7
October 1988	25.8
November 1988	26.1
December 1988	23.4
January 1989	22.0
February 1989	22.1
March 1989	25.3
April 1989	34.5
May 1989	55.7
June 1989	77.3
July 1989	79.9
August 1989	77.1
September 1989	73.5
October 1989	64.4
November 1989	56.4
December 1989	51.3
January 1990	49.5
February 1990	48.6
March 1990	43.9
April 1990	43.3
May 1990	44.5
June 1990	42.9
July 1990	42.1
August 1990	35.0
September 1990	32.4
October 1990	32.4
November 1990	29.1
December 1990	26.8
January 1991	28.6
February 1991	51.7
March 1991	53.6
April 1991	53.1
May 1991	55.1
June 1991	92.7
July 1991	107
August 1991	96.7
September 1991	99.4
October 1991	98.4
November 1991	97.1
December 1991	96.9
January 1992	95.1
February 1992	89.7
March 1992	77.1
April 1992	69.3
May 1992	94.4
June 1992	93.8
July 1992	83.8
August 1992	72.9
September 1992	54.7
October 1992	48.6
November 1992	47.7
December 1992	50.5
January 1993	61.6
February 1993	62.6
March 1993	54.5
April 1993	42.4
May 1993	82.9
June 1993	144
July 1993	166
August 1993	165
September 1993	156
October 1993	148
November 1993	148
December 1993	129
January 1994	112
February 1994	112
March 1994	106
April 1994	108
May 1994	111
June 1994	114
July 1994	118
August 1994	110
September 1994	101
October 1994	103
November 1994	109
December 1994	121
January 1995	122
February 1995	98.4
March 1995	86.5
April 1995	74.0
May 1995	99.3
June 1995	133
July 1995	158
August 1995	166
September 1995	163
October 1995	152
November 1995	154
December 1995	153
January 1996	145
February 1996	127
March 1996	107
April 1996	112
May 1996	149
June 1996	164
July 1996	166
August 1996	165
September 1996	164
October 1996	154
November 1996	142
December 1996	139
January 1997	146
February 1997	138
March 1997	131
April 1997	126
May 1997	145
June 1997	165
July 1997	166
August 1997	164
September 1997	146
October 1997	129
November 1997	114
December 1997	109
January 1998	109
February 1998	108
March 1998	77.9
April 1998	55.1
May 1998	77.1
June 1998	117
July 1998	159
August 1998	166
September 1998	165
October 1998	160
November 1998	149
December 1998	122
January 1999	114
February 1999	111
March 1999	112
April 1999	112
May 1999	119
June 1999	153
July 1999	163
August 1999	152
September 1999	144
October 1999	142
November 1999	133
December 1999	124
January 2000	110
February 2000	116
March 2000	113
April 2000	101
May 2000	121
June 2000	161
July 2000	164
August 2000	157
September 2000	147
October 2000	121
November 2000	101
December 2000	103
January 2001	107
February 2001	112
March 2001	120
April 2001	126
May 2001	147
June 2001	162
July 2001	155
August 2001	142
September 2001	132
October 2001	127
November 2001	134
December 2001	144
January 2002	143
February 2002	121
March 2002	105
April 2002	112
May 2002	130
June 2002	156
July 2002	151
August 2002	140
September 2002	134
October 2002	132
November 2002	139
December 2002	141
January 2003	138
February 2003	125
March 2003	111
April 2003	106
May 2003	105
June 2003	148
July 2003	164
August 2003	161
September 2003	156
October 2003	154
November 2003	155
December 2003	147
January 2004	132
February 2004	119
March 2004	112
April 2004	111
May 2004	114
June 2004	135
July 2004	144
August 2004	137
September 2004	139
October 2004	134
November 2004	130
December 2004	122
January 2005	119
February 2005	135
March 2005	140
April 2005	99.8
May 2005	97.8
June 2005	145
July 2005	165
August 2005	165
September 2005	160
October 2005	151
November 2005	136
December 2005	131
January 2006	132
February 2006	128
March 2006	136
April 2006	129
May 2006	121
June 2006	147
July 2006	164
August 2006	164
September 2006	163
October 2006	152
November 2006	140
December 2006	132
January 2007	121
February 2007	112
March 2007	106
April 2007	107
May 2007	112
June 2007	109
July 2007	110
August 2007	112
September 2007	110
October 2007	111
November 2007	112
December 2007	103
January 2008	92.8
February 2008	91.3
March 2008	105
April 2008	113
May 2008	115
June 2008	129
July 2008	137
August 2008	115
September 2008	105
October 2008	106
November 2008	112
December 2008	113
January 2009	115
February 2009	120
March 2009	121
April 2009	129
May 2009	147
June 2009	163
July 2009	157
August 2009	132
September 2009	115
October 2009	115
November 2009	115
December 2009	116
January 2010	113
February 2010	112
March 2010	106
April 2010	116
May 2010	117
June 2010	138
July 2010	153
August 2010	133
September 2010	101
October 2010	95.7
November 2010	63.1
December 2010	24.5
January 2011	26.7
February 2011	70.7
March 2011	123
April 2011	126
May 2011	125
June 2011	138
July 2011	160
August 2011	140
September 2011	70.3
October 2011	11.5
November 2011	5.67
December 2011	0.177
January 2012	0
February 2012	7.05
March 2012	59.9
April 2012	103
May 2012	113
June 2012	115
July 2012	110
August 2012	105
September 2012	99.8
October 2012	100
November 2012	102
December 2012	107
January 2013	106
February 2013	102
March 2013	102
April 2013	106
May 2013	106
June 2013	105
July 2013	104
August 2013	109
September 2013	105
October 2013	103
November 2013	101
December 2013	100
January 2014	99.7
February 2014	100
March 2014	103
April 2014	105
May 2014	104
June 2014	105
July 2014	106
August 2014	102
September 2014	88.7
October 2014	86.6
November 2014	85.5
December 2014	78.8
January 2015	79.1
February 2015	80.1
March 2015	81.1
April 2015	81.5
May 2015	83.8
June 2015	93.2
July 2015	104
August 2015	100
September 2015	94.4
October 2015	93.1
November 2015	94.6
December 2015	94.1
January 2016	101
February 2016	98.5
March 2016	96.0
April 2016	97.5
May 2016	116
June 2016	146
July 2016	152
August 2016	149
September 2016	135
October 2016	146
November 2016	144
December 2016	125
January 2017	120
February 2017	105
March 2017	78.5
April 2017	76.3
May 2017	102
June 2017	137
July 2017	143
August 2017	157
September 2017	147
October 2017	128
November 2017	103
December 2017	82.5
January 2018	69.9
February 2018	73.8
March 2018	82.3
April 2018	89.5
May 2018	93.4
June 2018	145
July 2018	151
August 2018	149
September 2018	145
October 2018	134
November 2018	113
December 2018	99.1
January 2019	87.8
February 2019	88.8
March 2019	71.2
April 2019	83.6
May 2019	118
June 2019	135
July 2019	145
August 2019	148
September 2019	135
October 2019	119
November 2019	109
December 2019	99.3
January 2020	88.8
February 2020	91.9
March 2020	95.0
April 2020	97.5
May 2020	99.4
June 2020	129
July 2020	147
August 2020	138
September 2020	132
October 2020	125
November 2020	119
December 2020	122
January 2021	123
February 2021	124
March 2021	125
April 2021	128
May 2021	131
June 2021	131
July 2021	124
August 2021	108
September 2021	96.2
October 2021	77.8
November 2021	67.3
December 2021	55.5
January 2022	50.4
February 2022	51.2
March 2022	60.2
April 2022	80.5
May 2022	91.1
June 2022	104
July 2022	104
August 2022	121
September 2022	126
October 2022	102
November 2022	95.6
December 2022	84.7
January 2023	96.6
February 2023	122
March 2023	126
April 2023	97.1
May 2023	136
June 2023	158
July 2023	151
August 2023	159
September 2023	146
October 2023	134
November 2023	139
December 2023	116
January 2024	91.9
February 2024	82.1
March 2024	73.4
April 2024	74.3
May 2024	106
June 2024	156
July 2024	153
August 2024	131
September 2024	104
October 2024	90.9
November 2024	93.5
December 2024	99.1
January 2025	101
February 2025	107
March 2025	116
April 2025	126
May 2025	131
June 2025	147
July 2025	144
August 2025	123
September 2025	115

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	101	101
Feb	100	107
Mar	99.1	116
Apr	98.9	126
May	111	131
Jun	134	147
Jul	142	144
Aug	137	123
Sep	127	115
Oct	119	90.9
Nov	114	93.5
Dec	108	99.1

Rate and persistence

+0.92 Mm³

Mean change 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

Shaver Lk Nr Big C CA

Gauge location

Where this comes from

1,185 monthly observations 1927–2025 Mm³

Spatially aggregatedHigh confidenceSeptember 2025

Source: USGS — National Water Information System, 11239500. 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.