Swanson Lake, Nebr. — storage

Storage now, against this reservoir's own record

96.85 Mm³

Stored, September 1994

71st

Percentile among 29 Seps on record

-14.5%

Change over the 12 months to 1994-09

Storage in September 1994 was higher than most Seps on record, ranked against 29 other Seps held for this reservoir.

Storage, 1965–1994

Monthly mean storage

348 monthly values, 1965 to 1994

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	Swanson Lake Near Trenton, Nebr. (Mm³)
October 1965	151
November 1965	148
December 1965	148
January 1966	148
February 1966	148
March 1966	149
April 1966	149
May 1966	148
June 1966	147
July 1966	138
August 1966	121
September 1966	95.0
October 1966	95.9
November 1966	103
December 1966	110
January 1967	118
February 1967	129
March 1967	137
April 1967	144
May 1967	150
June 1967	152
July 1967	156
August 1967	138
September 1967	122
October 1967	121
November 1967	124
December 1967	128
January 1968	131
February 1968	140
March 1968	146
April 1968	150
May 1968	151
June 1968	150
July 1968	130
August 1968	103
September 1968	98.9
October 1968	97.2
November 1968	99.3
December 1968	104
January 1969	109
February 1969	117
March 1969	129
April 1969	138
May 1969	150
June 1969	149
July 1969	139
August 1969	116
September 1969	103
October 1969	109
November 1969	126
December 1969	136
January 1970	141
February 1970	147
March 1970	149
April 1970	150
May 1970	149
June 1970	149
July 1970	129
August 1970	94.8
September 1970	74.1
October 1970	71.0
November 1970	73.0
December 1970	78.1
January 1971	82.4
February 1971	90.9
March 1971	106
April 1971	118
May 1971	134
June 1971	143
July 1971	131
August 1971	98.0
September 1971	77.3
October 1971	75.0
November 1971	77.6
December 1971	83.0
January 1972	87.9
February 1972	94.1
March 1972	103
April 1972	107
May 1972	114
June 1972	124
July 1972	128
August 1972	106
September 1972	92.2
October 1972	90.3
November 1972	97.2
December 1972	105
January 1973	114
February 1973	125
March 1973	139
April 1973	152
May 1973	153
June 1973	148
July 1973	130
August 1973	119
September 1973	102
October 1973	110
November 1973	118
December 1973	127
January 1974	136
February 1974	148
March 1974	149
April 1974	149
May 1974	150
June 1974	156
July 1974	134
August 1974	99.1
September 1974	79.4
October 1974	76.7
November 1974	78.5
December 1974	82.8
January 1975	88.1
February 1975	95.4
March 1975	105
April 1975	114
May 1975	120
June 1975	135
July 1975	132
August 1975	96.6
September 1975	78.9
October 1975	76.1
November 1975	75.8
December 1975	79.7
January 1976	86.4
February 1976	95.9
March 1976	106
April 1976	113
May 1976	119
June 1976	117
July 1976	93.6
August 1976	56.1
September 1976	33.9
October 1976	33.0
November 1976	33.0
December 1976	35.1
January 1977	38.4
February 1977	45.1
March 1977	58.6
April 1977	75.6
May 1977	90.9
June 1977	94.7
July 1977	71.3
August 1977	52.2
September 1977	49.4
October 1977	48.3
November 1977	49.9
December 1977	53.4
January 1978	57.1
February 1978	61.0
March 1978	70.0
April 1978	79.0
May 1978	86.1
June 1978	90.6
July 1978	65.4
August 1978	44.2
September 1978	35.5
October 1978	34.4
November 1978	34.1
December 1978	34.9
January 1979	36.4
February 1979	39.6
March 1979	50.2
April 1979	60.7
May 1979	65.1
June 1979	66.3
July 1979	72.2
August 1979	58.8
September 1979	45.7
October 1979	43.7
November 1979	45.7
December 1979	50.4
January 1980	56.3
February 1980	65.0
March 1980	77.6
April 1980	96.0
May 1980	111
June 1980	118
July 1980	101
August 1980	75.2
September 1980	66.5
October 1980	65.2
November 1980	66.2
December 1980	70.0
January 1981	75.8
February 1981	82.0
March 1981	95.0
April 1981	111
May 1981	132
June 1981	149
July 1981	135
August 1981	122
September 1981	111
October 1981	110
November 1981	113
December 1981	119
January 1982	123
February 1982	130
March 1982	140
April 1982	147
May 1982	155
June 1982	171
July 1982	170
August 1982	141
September 1982	128
October 1982	129
November 1982	132
December 1982	138
January 1983	144
February 1983	147
March 1983	149
April 1983	156
May 1983	159
June 1983	159
July 1983	138
August 1983	108
September 1983	92.2
October 1983	89.0
November 1983	89.2
December 1983	91.9
January 1984	96.6
February 1984	108
March 1984	122
April 1984	140
May 1984	161
June 1984	161
July 1984	146
August 1984	118
September 1984	100
October 1984	99.3
November 1984	103
December 1984	108
January 1985	114
February 1985	122
March 1985	134
April 1985	141
May 1985	150
June 1985	150
July 1985	131
August 1985	106
September 1985	91.4
October 1985	85.3
November 1985	90.0
December 1985	94.6
January 1986	103
February 1986	112
March 1986	120
April 1986	128
May 1986	131
June 1986	128
July 1986	107
August 1986	83.2
September 1986	71.9
October 1986	71.8
November 1986	75.2
December 1986	80.2
January 1987	85.8
February 1987	92.4
March 1987	101
April 1987	112
May 1987	124
June 1987	129
July 1987	112
August 1987	84.7
September 1987	74.9
October 1987	73.3
November 1987	75.2
December 1987	80.1
January 1988	83.5
February 1988	89.4
March 1988	100.0
April 1988	110
May 1988	122
June 1988	124
July 1988	101
August 1988	82.8
September 1988	73.5
October 1988	73.1
November 1988	73.5
December 1988	77.0
January 1989	81.2
February 1989	86.3
March 1989	93.6
April 1989	99.7
May 1989	102
June 1989	103
July 1989	95.2
August 1989	74.1
September 1989	65.8
October 1989	65.4
November 1989	67.3
December 1989	70.6
January 1990	75.4
February 1990	82.3
March 1990	90.8
April 1990	98.6
May 1990	106
June 1990	111
July 1990	84.2
August 1990	55.7
September 1990	45.5
October 1990	45.0
November 1990	45.8
December 1990	48.4
January 1991	50.3
February 1991	55.5
March 1991	62.5
April 1991	70.5
May 1991	79.1
June 1991	87.2
July 1991	69.9
August 1991	53.0
September 1991	46.7
October 1991	45.7
November 1991	49.0
December 1991	56.3
January 1992	64.8
February 1992	75.1
March 1992	87.9
April 1992	97.2
May 1992	100
June 1992	102
July 1992	89.1
August 1992	78.0
September 1992	79.5
October 1992	80.0
November 1992	83.5
December 1992	88.7
January 1993	93.8
February 1993	102
March 1993	114
April 1993	126
May 1993	134
June 1993	139
July 1993	129
August 1993	118
September 1993	113
October 1993	116
November 1993	120
December 1993	127
January 1994	133
February 1994	141
March 1994	151
April 1994	160
May 1994	163
June 1994	156
July 1994	132
August 1994	109
September 1994	96.8

Rate and persistence

-1.37 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

Swanson Lake Near Trenton, Nebr.

Gauge location

Where this comes from

348 monthly observations 1965–1994 Mm³

Spatially aggregatedHigh confidenceSeptember 1994

Source: USGS — National Water Information System, 06829000. 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.