Bucks Lk — storage

Storage now, against this reservoir's own record

98.40 Mm³

Stored, September 2025

68th

Percentile among 97 Seps on record

+2.1%

Against the Sep 1991–2020 average

-6.1%

Change over the 12 months to 2025-09

Storage in September 2025 was around the middle of the Sep record, ranked against 97 other Seps held for this reservoir.

Storage, 1928–2025

Monthly mean storage

1,164 monthly values, 1928 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	Bucks Lk Nr Bucks Lodge CA (Mm³)
October 1928	53.7
November 1928	42.6
December 1928	35.2
January 1929	28.2
February 1929	18.2
March 1929	18.1
April 1929	23.8
May 1929	34.2
June 1929	43.9
July 1929	45.7
August 1929	35.8
September 1929	26.6
October 1929	19.6
November 1929	16.5
December 1929	29.2
January 1930	40.5
February 1930	47.2
March 1930	56.1
April 1930	70.0
May 1930	89.6
June 1930	101
July 1930	95.8
August 1930	80.9
September 1930	66.4
October 1930	51.4
November 1930	38.5
December 1930	29.8
January 1931	20.9
February 1931	18.5
March 1931	23.0
April 1931	30.2
May 1931	36.7
June 1931	39.6
July 1931	39.9
August 1931	38.4
September 1931	38.0
October 1931	38.2
November 1931	39.2
December 1931	34.6
January 1932	37.3
February 1932	40.2
March 1932	43.8
April 1932	54.0
May 1932	74.0
June 1932	97.3
July 1932	104
August 1932	105
September 1932	105
October 1932	105
November 1932	103
December 1932	98.4
January 1933	93.7
February 1933	81.2
March 1933	76.8
April 1933	81.7
May 1933	91.4
June 1933	107
July 1933	112
August 1933	103
September 1933	98.6
October 1933	95.8
November 1933	93.5
December 1933	93.6
January 1934	100
February 1934	105
March 1934	113
April 1934	125
May 1934	124
June 1934	121
July 1934	111
August 1934	94.4
September 1934	81.3
October 1934	77.3
November 1934	79.4
December 1934	82.8
January 1935	88.5
February 1935	92.3
March 1935	94.9
April 1935	93.9
May 1935	112
June 1935	127
July 1935	126
August 1935	121
September 1935	115
October 1935	112
November 1935	101
December 1935	84.1
January 1936	81.8
February 1936	91.5
March 1936	102
April 1936	115
May 1936	128
June 1936	127
July 1936	125
August 1936	116
September 1936	105
October 1936	89.9
November 1936	76.3
December 1936	74.7
January 1937	77.6
February 1937	81.9
March 1937	86.4
April 1937	91.6
May 1937	105
June 1937	126
July 1937	124
August 1937	120
September 1937	113
October 1937	98.9
November 1937	87.3
December 1937	105
January 1938	107
February 1938	108
March 1938	99.0
April 1938	92.5
May 1938	108
June 1938	130
July 1938	128
August 1938	122
September 1938	113
October 1938	109
November 1938	106
December 1938	98.0
January 1939	87.0
February 1939	80.6
March 1939	80.7
April 1939	89.7
May 1939	99.7
June 1939	104
July 1939	105
August 1939	103
September 1939	93.8
October 1939	87.5
November 1939	81.8
December 1939	76.5
January 1940	86.3
February 1940	101
March 1940	118
April 1940	128
May 1940	128
June 1940	127
July 1940	120
August 1940	113
September 1940	106
October 1940	95.6
November 1940	92.5
December 1940	87.5
January 1941	101
February 1941	107
March 1941	105
April 1941	102
May 1941	119
June 1941	128
July 1941	126
August 1941	120
September 1941	113
October 1941	108
November 1941	105
December 1941	113
January 1942	114
February 1942	116
March 1942	106
April 1942	101
May 1942	110
June 1942	127
July 1942	126
August 1942	121
September 1942	112
October 1942	105
November 1942	105
December 1942	111
January 1943	117
February 1943	118
March 1943	112
April 1943	114
May 1943	125
June 1943	127
July 1943	125
August 1943	118
September 1943	117
October 1943	114
November 1943	112
December 1943	108
January 1944	102
February 1944	97.8
March 1944	94.0
April 1944	87.5
May 1944	95.3
June 1944	112
July 1944	114
August 1944	110
September 1944	106
October 1944	96.1
November 1944	96.8
December 1944	98.5
January 1945	101
February 1945	107
March 1945	108
April 1945	108
May 1945	124
June 1945	127
July 1945	123
August 1945	111
September 1945	100
October 1945	91.2
November 1945	91.3
December 1945	97.3
January 1946	104
February 1946	95.9
March 1946	92.9
April 1946	97.3
May 1946	119
June 1946	127
July 1946	124
August 1946	113
September 1946	99.3
October 1946	86.8
November 1946	80.0
December 1946	87.8
January 1947	88.9
February 1947	92.8
March 1947	102
April 1947	114
May 1947	124
June 1947	125
July 1947	117
August 1947	101
September 1947	91.3
October 1947	85.8
November 1947	87.9
December 1947	80.8
January 1948	82.5
February 1948	76.8
March 1948	70.5
April 1948	79.3
May 1948	99.0
June 1948	124
July 1948	126
August 1948	115
September 1948	103
October 1948	98.9
November 1948	95.3
December 1948	92.4
January 1949	90.7
February 1949	82.5
March 1949	76.5
April 1949	74.8
May 1949	93.6
June 1949	107
July 1949	105
August 1949	102
September 1949	99.2
October 1949	95.9
November 1949	93.2
December 1949	88.1
January 1950	83.2
February 1950	83.2
March 1950	74.5
April 1950	82.1
May 1950	104
June 1950	125
July 1950	125
August 1950	115
September 1950	103
October 1950	93.4
November 1950	97.7
December 1950	118
January 1951	114
February 1951	110
March 1951	107
April 1951	109
May 1951	124
June 1951	123
July 1951	113
August 1951	101
September 1951	92.4
October 1951	87.2
November 1951	83.5
December 1951	88.0
January 1952	90.2
February 1952	86.7
March 1952	75.4
April 1952	69.0
May 1952	88.6
June 1952	126
July 1952	126
August 1952	111
September 1952	93.4
October 1952	80.5
November 1952	68.8
December 1952	63.9
January 1953	67.5
February 1953	78.4
March 1953	84.2
April 1953	93.3
May 1953	114
June 1953	127
July 1953	126
August 1953	111
September 1953	93.0
October 1953	75.4
November 1953	65.7
December 1953	63.7
January 1954	65.8
February 1954	72.6
March 1954	83.3
April 1954	99.8
May 1954	120
June 1954	124
July 1954	115
August 1954	96.6
September 1954	80.4
October 1954	68.8
November 1954	54.7
December 1954	44.6
January 1955	39.3
February 1955	41.6
March 1955	44.5
April 1955	50.4
May 1955	63.4
June 1955	78.0
July 1955	73.0
August 1955	60.7
September 1955	52.9
October 1955	47.7
November 1955	40.6
December 1955	48.5
January 1956	83.9
February 1956	86.7
March 1956	78.3
April 1956	72.1
May 1956	94.2
June 1956	123
July 1956	116
August 1956	97.8
September 1956	79.8
October 1956	63.4
November 1956	51.4
December 1956	45.5
January 1957	46.9
February 1957	46.1
March 1957	63.7
April 1957	75.5
May 1957	92.9
June 1957	108
July 1957	107
August 1957	91.9
September 1957	74.4
October 1957	67.4
November 1957	58.3
December 1957	48.3
January 1958	45.4
February 1958	56.0
March 1958	72.7
April 1958	72.6
May 1958	92.9
June 1958	125
July 1958	118
August 1958	101
September 1958	82.8
October 1958	65.7
November 1958	50.7
December 1958	41.4
January 1959	48.6
February 1959	57.0
March 1959	64.8
April 1959	75.6
May 1959	89.9
June 1959	96.9
July 1959	93.1
August 1959	80.1
September 1959	74.4
October 1959	62.5
November 1959	53.2
December 1959	44.4
January 1960	45.5
February 1960	55.8
March 1960	65.4
April 1960	80.4
May 1960	96.0
June 1960	105
July 1960	91.0
August 1960	73.6
September 1960	63.9
October 1960	55.8
November 1960	51.0
December 1960	52.0
January 1961	46.5
February 1961	52.2
March 1961	58.5
April 1961	67.8
May 1961	81.3
June 1961	93.6
July 1961	81.2
August 1961	64.0
September 1961	58.0
October 1961	57.9
November 1961	54.8
December 1961	56.5
January 1962	58.4
February 1962	63.1
March 1962	70.0
April 1962	78.5
May 1962	100
June 1962	122
July 1962	120
August 1962	104
September 1962	94.9
October 1962	93.1
November 1962	96.8
December 1962	100
January 1963	97.2
February 1963	113
March 1963	109
April 1963	115
May 1963	125
June 1963	123
July 1963	109
August 1963	90.8
September 1963	73.9
October 1963	59.6
November 1963	54.4
December 1963	48.5
January 1964	48.2
February 1964	52.6
March 1964	56.1
April 1964	62.3
May 1964	75.1
June 1964	86.2
July 1964	85.7
August 1964	70.4
September 1964	54.7
October 1964	43.2
November 1964	44.9
December 1964	61.1
January 1965	100
February 1965	96.8
March 1965	89.3
April 1965	85.8
May 1965	105
June 1965	115
July 1965	102
August 1965	84.8
September 1965	68.4
October 1965	52.2
November 1965	46.9
December 1965	47.1
January 1966	46.9
February 1966	50.1
March 1966	54.1
April 1966	66.1
May 1966	86.1
June 1966	96.2
July 1966	91.9
August 1966	75.7
September 1966	65.4
October 1966	57.0
November 1966	49.7
December 1966	57.9
January 1967	49.8
February 1967	59.8
March 1967	69.9
April 1967	82.2
May 1967	86.2
June 1967	120
July 1967	125
August 1967	108
September 1967	90.0
October 1967	73.5
November 1967	57.9
December 1967	46.4
January 1968	47.6
February 1968	55.0
March 1968	66.8
April 1968	77.7
May 1968	93.4
June 1968	105
July 1968	99.6
August 1968	82.2
September 1968	66.5
October 1968	53.2
November 1968	48.7
December 1968	45.7
January 1969	50.2
February 1969	68.6
March 1969	61.2
April 1969	58.2
May 1969	89.3
June 1969	126
July 1969	119
August 1969	101
September 1969	82.7
October 1969	66.0
November 1969	52.7
December 1969	49.4
January 1970	74.2
February 1970	107
March 1970	103
April 1970	100
May 1970	111
June 1970	123
July 1970	123
August 1970	108
September 1970	88.6
October 1970	71.1
November 1970	63.0
December 1970	67.0
January 1971	60.3
February 1971	51.9
March 1971	47.2
April 1971	60.3
May 1971	82.1
June 1971	115
July 1971	122
August 1971	108
September 1971	92.4
October 1971	76.7
November 1971	63.5
December 1971	62.6
January 1972	58.0
February 1972	53.4
March 1972	63.0
April 1972	78.5
May 1972	94.8
June 1972	107
July 1972	107
August 1972	96.8
September 1972	84.1
October 1972	82.2
November 1972	80.9
December 1972	70.5
January 1973	67.9
February 1973	67.7
March 1973	67.5
April 1973	60.3
May 1973	81.2
June 1973	108
July 1973	108
August 1973	91.6
September 1973	75.5
October 1973	73.6
November 1973	90.2
December 1973	107
January 1974	119
February 1974	126
March 1974	125
April 1974	127
May 1974	128
June 1974	129
July 1974	128
August 1974	115
September 1974	95.3
October 1974	80.4
November 1974	74.7
December 1974	75.6
January 1975	74.6
February 1975	74.2
March 1975	76.9
April 1975	74.5
May 1975	81.4
June 1975	117
July 1975	127
August 1975	112
September 1975	95.1
October 1975	79.5
November 1975	70.1
December 1975	57.5
January 1976	46.3
February 1976	44.1
March 1976	50.0
April 1976	55.4
May 1976	62.8
June 1976	66.5
July 1976	66.7
August 1976	66.3
September 1976	64.4
October 1976	55.6
November 1976	54.1
December 1976	53.1
January 1977	53.7
February 1977	54.8
March 1977	55.6
April 1977	57.4
May 1977	60.6
June 1977	62.4
July 1977	62.2
August 1977	58.8
September 1977	47.2
October 1977	45.3
November 1977	45.3
December 1977	49.4
January 1978	64.4
February 1978	66.7
March 1978	65.9
April 1978	71.4
May 1978	84.2
June 1978	108
July 1978	119
August 1978	107
September 1978	91.9
October 1978	80.2
November 1978	65.1
December 1978	60.3
January 1979	59.4
February 1979	49.6
March 1979	46.1
April 1979	53.8
May 1979	72.9
June 1979	93.7
July 1979	93.8
August 1979	79.6
September 1979	73.0
October 1979	64.1
November 1979	56.0
December 1979	46.7
January 1980	60.1
February 1980	80.8
March 1980	97.2
April 1980	97.2
May 1980	115
June 1980	125
July 1980	123
August 1980	111
September 1980	97.8
October 1980	84.1
November 1980	71.2
December 1980	64.6
January 1981	59.9
February 1981	65.5
March 1981	73.4
April 1981	82.6
May 1981	96.5
June 1981	101
July 1981	97.3
August 1981	96.8
September 1981	89.8
October 1981	74.0
November 1981	79.4
December 1981	105
January 1982	119
February 1982	116
March 1982	125
April 1982	127
May 1982	129
June 1982	130
July 1982	121
August 1982	103
September 1982	86.9
October 1982	72.8
November 1982	65.7
December 1982	66.1
January 1983	63.5
February 1983	74.1
March 1983	91.0
April 1983	99.8
May 1983	106
June 1983	130
July 1983	129
August 1983	119
September 1983	102
October 1983	87.5
November 1983	84.5
December 1983	90.9
January 1984	103
February 1984	96.9
March 1984	92.9
April 1984	90.5
May 1984	104
June 1984	115
July 1984	108
August 1984	90.9
September 1984	74.4
October 1984	59.5
November 1984	49.2
December 1984	43.0
January 1985	45.3
February 1985	48.4
March 1985	52.2
April 1985	61.1
May 1985	74.9
June 1985	81.8
July 1985	78.3
August 1985	71.3
September 1985	62.7
October 1985	55.7
November 1985	54.9
December 1985	56.0
January 1986	59.2
February 1986	88.0
March 1986	125
April 1986	125
May 1986	129
June 1986	128
July 1986	121
August 1986	111
September 1986	101
October 1986	94.9
November 1986	84.7
December 1986	69.2
January 1987	67.0
February 1987	71.6
March 1987	81.8
April 1987	92.2
May 1987	101
June 1987	103
July 1987	102
August 1987	91.0
September 1987	75.0
October 1987	59.5
November 1987	55.2
December 1987	57.9
January 1988	54.7
February 1988	55.5
March 1988	59.9
April 1988	67.4
May 1988	78.2
June 1988	84.7
July 1988	85.9
August 1988	82.4
September 1988	74.9
October 1988	63.5
November 1988	54.3
December 1988	52.5
January 1989	55.3
February 1989	57.2
March 1989	75.4
April 1989	102
May 1989	120
June 1989	124
July 1989	116
August 1989	105
September 1989	96.1
October 1989	94.7
November 1989	89.6
December 1989	77.5
January 1990	66.6
February 1990	68.6
March 1990	73.3
April 1990	81.0
May 1990	88.5
June 1990	97.6
July 1990	98.8
August 1990	91.1
September 1990	81.6
October 1990	81.1
November 1990	77.0
December 1990	64.8
January 1991	59.2
February 1991	61.0
March 1991	70.8
April 1991	77.8
May 1991	88.4
June 1991	99.7
July 1991	103
August 1991	103
September 1991	103
October 1991	101
November 1991	93.4
December 1991	79.5
January 1992	67.5
February 1992	67.1
March 1992	73.7
April 1992	82.9
May 1992	95.5
June 1992	98.7
July 1992	99.9
August 1992	95.4
September 1992	90.3
October 1992	75.8
November 1992	71.8
December 1992	68.7
January 1993	63.4
February 1993	59.9
March 1993	58.2
April 1993	78.0
May 1993	105
June 1993	129
July 1993	125
August 1993	112
September 1993	107
October 1993	97.7
November 1993	87.7
December 1993	81.4
January 1994	79.4
February 1994	82.4
March 1994	87.7
April 1994	94.9
May 1994	106
June 1994	112
July 1994	110
August 1994	101
September 1994	91.7
October 1994	80.6
November 1994	75.4
December 1994	63.2
January 1995	65.6
February 1995	70.0
March 1995	87.9
April 1995	109
May 1995	129
June 1995	129
July 1995	127
August 1995	113
September 1995	96.2
October 1995	83.6
November 1995	74.1
December 1995	77.0
January 1996	86.5
February 1996	102
March 1996	109
April 1996	117
May 1996	127
June 1996	128
July 1996	123
August 1996	109
September 1996	92.1
October 1996	79.2
November 1996	68.6
December 1996	76.1
January 1997	127
February 1997	124
March 1997	119
April 1997	121
May 1997	123
June 1997	124
July 1997	125
August 1997	117
September 1997	104
October 1997	87.7
November 1997	72.7
December 1997	62.1
January 1998	63.6
February 1998	77.6
March 1998	74.6
April 1998	78.0
May 1998	96.6
June 1998	124
July 1998	127
August 1998	113
September 1998	98.6
October 1998	84.1
November 1998	71.5
December 1998	71.8
January 1999	65.1
February 1999	73.1
March 1999	80.2
April 1999	80.8
May 1999	98.9
June 1999	120
July 1999	118
August 1999	102
September 1999	93.4
October 1999	86.0
November 1999	71.9
December 1999	61.7
January 2000	63.3
February 2000	74.8
March 2000	86.2
April 2000	99.0
May 2000	116
June 2000	122
July 2000	115
August 2000	100
September 2000	89.9
October 2000	80.7
November 2000	66.9
December 2000	56.8
January 2001	56.4
February 2001	56.6
March 2001	59.8
April 2001	67.1
May 2001	81.0
June 2001	87.2
July 2001	88.0
August 2001	87.7
September 2001	86.6
October 2001	78.5
November 2001	71.3
December 2001	71.8
January 2002	74.4
February 2002	75.7
March 2002	82.7
April 2002	94.2
May 2002	109
June 2002	118
July 2002	118
August 2002	109
September 2002	97.1
October 2002	79.0
November 2002	68.3
December 2002	62.9
January 2003	72.7
February 2003	79.0
March 2003	88.3
April 2003	104
May 2003	119
June 2003	128
July 2003	122
August 2003	115
September 2003	102
October 2003	87.1
November 2003	72.9
December 2003	67.4
January 2004	63.3
February 2004	68.8
March 2004	79.9
April 2004	95.5
May 2004	117
June 2004	125
July 2004	119
August 2004	107
September 2004	96.5
October 2004	90.7
November 2004	82.7
December 2004	69.7
January 2005	60.3
February 2005	60.7
March 2005	67.3
April 2005	78.8
May 2005	105
June 2005	128
July 2005	123
August 2005	110
September 2005	97.7
October 2005	84.2
November 2005	73.7
December 2005	73.1
January 2006	102
February 2006	99.9
March 2006	103
April 2006	110
May 2006	125
June 2006	129
July 2006	121
August 2006	106
September 2006	96.3
October 2006	91.9
November 2006	85.0
December 2006	80.8
January 2007	73.8
February 2007	78.0
March 2007	86.7
April 2007	96.6
May 2007	106
June 2007	109
July 2007	108
August 2007	97.1
September 2007	87.2
October 2007	78.7
November 2007	68.5
December 2007	64.5
January 2008	64.8
February 2008	64.8
March 2008	67.1
April 2008	72.1
May 2008	86.1
June 2008	97.9
July 2008	97.6
August 2008	89.9
September 2008	84.4
October 2008	78.9
November 2008	74.0
December 2008	68.2
January 2009	67.6
February 2009	72.6
March 2009	87.2
April 2009	97.5
May 2009	119
June 2009	124
July 2009	120
August 2009	110
September 2009	100
October 2009	92.0
November 2009	85.4
December 2009	78.6
January 2010	75.9
February 2010	77.0
March 2010	76.9
April 2010	84.6
May 2010	96.4
June 2010	121
July 2010	127
August 2010	118
September 2010	103
October 2010	91.8
November 2010	88.8
December 2010	97.3
January 2011	104
February 2011	97.9
March 2011	94.3
April 2011	92.2
May 2011	102
June 2011	116
July 2011	127
August 2011	125
September 2011	127
October 2011	118
November 2011	102
December 2011	88.6
January 2012	88.0
February 2012	91.9
March 2012	98.4
April 2012	111
May 2012	126
June 2012	125
July 2012	115
August 2012	105
September 2012	90.8
October 2012	80.5
November 2012	79.0
December 2012	94.7
January 2013	98.8
February 2013	96.5
March 2013	94.1
April 2013	104
May 2013	112
June 2013	114
July 2013	108
August 2013	98.7
September 2013	88.8
October 2013	81.1
November 2013	70.9
December 2013	64.3
January 2014	64.1
February 2014	66.9
March 2014	75.2
April 2014	84.2
May 2014	88.6
June 2014	88.3
July 2014	86.8
August 2014	83.5
September 2014	82.3
October 2014	81.5
November 2014	77.8
December 2014	83.7
January 2015	87.0
February 2015	97.5
March 2015	105
April 2015	108
May 2015	109
June 2015	106
July 2015	99.4
August 2015	95.2
September 2015	90.0
October 2015	89.1
November 2015	83.9
December 2015	80.2
January 2016	81.2
February 2016	87.3
March 2016	105
April 2016	123
May 2016	129
June 2016	126
July 2016	123
August 2016	112
September 2016	104
October 2016	99.2
November 2016	98.0
December 2016	99.8
January 2017	112
February 2017	125
March 2017	126
April 2017	128
May 2017	128
June 2017	126
July 2017	120
August 2017	107
September 2017	97.9
October 2017	95.4
November 2017	93.4
December 2017	87.4
January 2018	86.8
February 2018	84.8
March 2018	91.6
April 2018	112
May 2018	124
June 2018	126
July 2018	120
August 2018	107
September 2018	96.6
October 2018	91.6
November 2018	90.0
December 2018	92.3
January 2019	98.3
February 2019	111
March 2019	124
April 2019	127
May 2019	127
June 2019	126
July 2019	120
August 2019	114
September 2019	105
October 2019	93.2
November 2019	77.6
December 2019	68.2
January 2020	64.0
February 2020	65.5
March 2020	68.9
April 2020	75.5
May 2020	86.9
June 2020	92.9
July 2020	93.4
August 2020	92.6
September 2020	91.8
October 2020	91.4
November 2020	88.9
December 2020	86.7
January 2021	87.1
February 2021	88.2
March 2021	90.8
April 2021	95.1
May 2021	101
June 2021	102
July 2021	101
August 2021	97.2
September 2021	93.6
October 2021	91.8
November 2021	96.5
December 2021	98.3
January 2022	104
February 2022	104
March 2022	107
April 2022	116
May 2022	126
June 2022	127
July 2022	124
August 2022	117
September 2022	109
October 2022	102
November 2022	97.8
December 2022	96.5
January 2023	105
February 2023	105
March 2023	106
April 2023	101
May 2023	113
June 2023	127
July 2023	121
August 2023	114
September 2023	112
October 2023	108
November 2023	103
December 2023	96.3
January 2024	95.8
February 2024	98.5
March 2024	93.9
April 2024	99.3
May 2024	119
June 2024	120
July 2024	114
August 2024	108
September 2024	105
October 2024	101
November 2024	96.1
December 2024	94.4
January 2025	91.3
February 2025	100.0
March 2025	98.2
April 2025	107
May 2025	123
June 2025	122
July 2025	119
August 2025	111
September 2025	98.4

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	77.9	91.3
Feb	81.7	100.0
Mar	87.7	98.2
Apr	96.8	107
May	109	123
Jun	117	122
Jul	114	119
Aug	105	111
Sep	96.4	98.4
Oct	87.7	101
Nov	79.6	96.1
Dec	76.0	94.4

Rate and persistence

-0.54 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

Bucks Lk Nr Bucks Lodge CA

Gauge location

Where this comes from

1,164 monthly observations 1928–2025 Mm³

Spatially aggregatedHigh confidenceSeptember 2025

Source: USGS — National Water Information System, 11403500. 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.