Lake Lowell — storage

Storage now, against this reservoir's own record

167.30 Mm³

Stored, September 1965

100th

Percentile among 48 Seps on record

+32.3%

Change over the 12 months to 1965-09

Storage in September 1965 was higher than almost every other Sep on record, ranked against 48 other Seps held for this reservoir. It is the highest in the held record for this month.

Storage, 1917–1965

Monthly mean storage

576 monthly values, 1917 to 1965

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	Lake Lowell Nr Caldwell ID (Mm³)
October 1917	17.9
November 1917	18.0
December 1917	19.2
January 1918	60.5
February 1918	116
March 1918	148
April 1918	193
May 1918	162
June 1918	140
July 1918	105
August 1918	57.1
September 1918	24.3
October 1918	28.7
November 1918	30.6
December 1918	41.2
January 1919	75.1
February 1919	101
March 1919	148
April 1919	197
May 1919	179
June 1919	128
July 1919	68.7
August 1919	24.0
September 1919	13.0
October 1919	19.4
November 1919	39.1
December 1919	61.1
January 1920	60.6
February 1920	89.0
March 1920	145
April 1920	205
May 1920	194
June 1920	147
July 1920	104
August 1920	46.2
September 1920	16.2
October 1920	16.9
November 1920	49.6
December 1920	101
January 1921	101
February 1921	126
March 1921	180
April 1921	214
May 1921	214
June 1921	198
July 1921	138
August 1921	78.0
September 1921	44.8
October 1921	41.8
November 1921	54.1
December 1921	104
January 1922	108
February 1922	107
March 1922	152
April 1922	201
May 1922	198
June 1922	149
July 1922	92.8
August 1922	46.9
September 1922	19.6
October 1922	13.0
November 1922	17.8
December 1922	55.4
January 1923	82.3
February 1923	99.0
March 1923	144
April 1923	188
May 1923	184
June 1923	200
July 1923	176
August 1923	102
September 1923	48.7
October 1923	39.3
November 1923	47.2
December 1923	75.9
January 1924	80.4
February 1924	113
March 1924	183
April 1924	196
May 1924	144
June 1924	91.0
July 1924	38.2
August 1924	12.5
September 1924	8.01
October 1924	6.87
November 1924	14.7
December 1924	54.0
January 1925	59.8
February 1925	90.9
March 1925	167
April 1925	211
May 1925	186
June 1925	151
July 1925	106
August 1925	51.7
September 1925	24.8
October 1925	29.7
November 1925	39.6
December 1925	88.2
January 1926	109
February 1926	128
March 1926	178
April 1926	206
May 1926	155
June 1926	100
July 1926	57.3
August 1926	27.4
September 1926	12.3
October 1926	8.86
November 1926	15.8
December 1926	67.1
January 1927	71.9
February 1927	99.4
March 1927	176
April 1927	210
May 1927	196
June 1927	185
July 1927	141
August 1927	89.4
September 1927	59.2
October 1927	78.5
November 1927	91.1
December 1927	107
January 1928	120
February 1928	150
March 1928	193
April 1928	209
May 1928	191
June 1928	146
July 1928	97.8
August 1928	54.8
September 1928	28.5
October 1928	18.1
November 1928	40.5
December 1928	78.7
January 1929	78.2
February 1929	82.4
March 1929	135
April 1929	204
May 1929	201
June 1929	181
July 1929	138
August 1929	70.6
September 1929	20.3
October 1929	13.9
November 1929	23.8
December 1929	70.3
January 1930	95.2
February 1930	116
March 1930	173
April 1930	202
May 1930	163
June 1930	144
July 1930	90.7
August 1930	49.7
September 1930	23.2
October 1930	18.3
November 1930	48.0
December 1930	91.1
January 1931	92.1
February 1931	94.3
March 1931	128
April 1931	194
May 1931	166
June 1931	96.4
July 1931	44.6
August 1931	14.1
September 1931	8.85
October 1931	8.62
November 1931	12.2
December 1931	27.4
January 1932	44.5
February 1932	78.2
March 1932	126
April 1932	204
May 1932	211
June 1932	211
July 1932	160
August 1932	84.4
September 1932	29.5
October 1932	13.7
November 1932	20.4
December 1932	30.0
January 1933	83.8
February 1933	92.2
March 1933	143
April 1933	207
May 1933	211
June 1933	171
July 1933	112
August 1933	50.1
September 1933	16.8
October 1933	11.1
November 1933	21.0
December 1933	67.4
January 1934	96.1
February 1934	119
March 1934	154
April 1934	168
May 1934	111
June 1934	74.5
July 1934	40.9
August 1934	16.6
September 1934	10.2
October 1934	8.13
November 1934	21.8
December 1934	72.3
January 1935	92.8
February 1935	110
March 1935	143
April 1935	206
May 1935	201
June 1935	172
July 1935	114
August 1935	55.7
September 1935	20.0
October 1935	10.8
November 1935	26.5
December 1935	66.4
January 1936	91.7
February 1936	111
March 1936	155
April 1936	204
May 1936	207
June 1936	197
July 1936	136
August 1936	70.7
September 1936	27.5
October 1936	12.1
November 1936	15.2
December 1936	53.1
January 1937	101
February 1937	102
March 1937	148
April 1937	206
May 1937	182
June 1937	138
July 1937	80.7
August 1937	39.3
September 1937	18.3
October 1937	10.4
November 1937	19.7
December 1937	85.4
January 1938	102
February 1938	124
March 1938	182
April 1938	212
May 1938	214
June 1938	204
July 1938	185
August 1938	128
September 1938	80.5
October 1938	71.3
November 1938	82.2
December 1938	105
January 1939	115
February 1939	120
March 1939	170
April 1939	210
May 1939	188
June 1939	148
July 1939	95.1
August 1939	50.2
September 1939	29.1
October 1939	23.2
November 1939	43.7
December 1939	96.4
January 1940	107
February 1940	122
March 1940	176
April 1940	216
May 1940	202
June 1940	161
July 1940	103
August 1940	53.9
September 1940	33.5
October 1940	39.5
November 1940	49.3
December 1940	101
January 1941	110
February 1941	129
March 1941	173
April 1941	213
May 1941	191
June 1941	210
July 1941	169
August 1941	109
September 1941	74.6
October 1941	65.8
November 1941	77.0
December 1941	111
January 1942	113
February 1942	134
March 1942	171
April 1942	214
May 1942	219
June 1942	217
July 1942	172
August 1942	99.5
September 1942	49.1
October 1942	36.2
November 1942	46.4
December 1942	103
January 1943	113
February 1943	124
March 1943	175
April 1943	209
May 1943	213
June 1943	213
July 1943	178
August 1943	118
September 1943	70.1
October 1943	62.9
November 1943	76.6
December 1943	114
January 1944	121
February 1944	138
March 1944	182
April 1944	206
May 1944	198
June 1944	198
July 1944	165
August 1944	91.0
September 1944	37.9
October 1944	23.2
November 1944	35.9
December 1944	93.6
January 1945	106
February 1945	124
March 1945	178
April 1945	208
May 1945	211
June 1945	214
July 1945	163
August 1945	87.3
September 1945	33.3
October 1945	17.9
November 1945	36.8
December 1945	103
January 1946	113
February 1946	117
March 1946	170
April 1946	208
May 1946	187
June 1946	176
July 1946	129
August 1946	74.9
September 1946	40.1
October 1946	23.3
November 1946	50.4
December 1946	111
January 1947	113
February 1947	119
March 1947	175
April 1947	211
May 1947	193
June 1947	203
July 1947	151
August 1947	75.7
September 1947	34.7
October 1947	88.2
November 1947	120
December 1947	124
January 1948	127
February 1948	130
March 1948	180
April 1948	215
May 1948	215
June 1948	209
July 1948	163
August 1948	88.9
September 1948	47.9
October 1948	65.9
November 1948	80.0
December 1948	108
January 1949	110
February 1949	113
March 1949	158
April 1949	204
May 1949	176
June 1949	161
July 1949	109
August 1949	62.8
September 1949	34.7
October 1949	30.7
November 1949	56.1
December 1949	109
January 1950	114
February 1950	123
March 1950	173
April 1950	209
May 1950	207
June 1950	181
July 1950	149
August 1950	85.9
September 1950	48.4
October 1950	70.4
November 1950	91.1
December 1950	115
January 1951	118
February 1951	126
March 1951	177
April 1951	208
May 1951	208
June 1951	200
July 1951	148
August 1951	87.0
September 1951	55.7
October 1951	77.0
November 1951	94.3
December 1951	115
January 1952	119
February 1952	123
March 1952	166
April 1952	201
May 1952	199
June 1952	171
July 1952	133
August 1952	77.2
September 1952	54.4
October 1952	79.7
November 1952	98.9
December 1952	115
January 1953	118
February 1953	135
March 1953	184
April 1953	213
May 1953	208
June 1953	214
July 1953	157
August 1953	91.2
September 1953	57.0
October 1953	78.9
November 1953	89.6
December 1953	114
January 1954	118
February 1954	127
March 1954	175
April 1954	210
May 1954	176
June 1954	179
July 1954	136
August 1954	71.7
September 1954	73.2
October 1954	113
November 1954	124
December 1954	127
January 1955	130
February 1955	133
March 1955	159
April 1955	194
May 1955	196
June 1955	150
July 1955	100
August 1955	39.6
September 1955	32.7
October 1955	84.9
November 1955	98.2
December 1955	104
January 1956	108
February 1956	119
March 1956	165
April 1956	198
May 1956	196
June 1956	182
July 1956	124
August 1956	74.6
September 1956	70.1
October 1956	110
November 1956	118
December 1956	123
January 1957	126
February 1957	149
March 1957	186
April 1957	209
May 1957	213
June 1957	174
July 1957	106
August 1957	54.2
September 1957	54.8
October 1957	104
November 1957	113
December 1957	119
January 1958	131
February 1958	188
March 1958	198
April 1958	206
May 1958	208
June 1958	197
July 1958	153
August 1958	110
September 1958	104
October 1958	123
November 1958	126
December 1958	131
January 1959	135
February 1959	166
March 1959	199
April 1959	207
May 1959	215
June 1959	195
July 1959	135
August 1959	71.1
September 1959	41.0
October 1959	30.7
November 1959	27.5
December 1959	28.7
January 1960	28.6
February 1960	69.6
March 1960	148
April 1960	205
May 1960	199
June 1960	186
July 1960	122
August 1960	82.2
September 1960	83.6
October 1960	126
November 1960	136
December 1960	138
January 1961	141
February 1961	144
March 1961	155
April 1961	206
May 1961	193
June 1961	190
July 1961	145
August 1961	90.4
September 1961	73.3
October 1961	78.3
November 1961	84.5
December 1961	115
January 1962	132
February 1962	138
March 1962	188
April 1962	197
May 1962	195
June 1962	204
July 1962	150
August 1962	116
September 1962	111
October 1962	138
November 1962	144
December 1962	147
January 1963	149
February 1963	158
March 1963	197
April 1963	204
May 1963	204
June 1963	205
July 1963	177
August 1963	139
September 1963	129
October 1963	142
November 1963	149
December 1963	152
January 1964	155
February 1964	169
March 1964	188
April 1964	195
May 1964	209
June 1964	214
July 1964	177
August 1964	131
September 1964	126
October 1964	165
November 1964	171
December 1964	174
January 1965	176
February 1965	202
March 1965	218
April 1965	215
May 1965	213
June 1965	217
July 1965	194
August 1965	160
September 1965	167

Rate and persistence

+3.40 Mm³

Mean change per month over 12 months

1 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

Lake Lowell Nr Caldwell ID

Gauge location

Where this comes from

576 monthly observations 1917–1965 Mm³

Spatially aggregatedHigh confidenceSeptember 1965

Source: USGS — National Water Information System, 13203500. 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.