Lake Sumner, NM — storage

Storage now, against this reservoir's own record

35.35 Mm³

Stored, January 2017

43rd

Percentile among 52 Jans on record

+6.9%

Against the Jan 1991–2020 average

-36.8%

Change over the 12 months to 2017-01

Storage in January 2017 was around the middle of the Jan record, ranked against 52 other Jans held for this reservoir.

Storage, 1965–2017

Monthly mean storage

615 monthly values, 1965 to 2017

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 Sumner Nr Fort Sumner, NM (Mm³)
October 1965	53.4
November 1965	47.2
December 1965	52.9
January 1966	59.4
February 1966	65.3
March 1966	52.9
April 1966	33.0
May 1966	33.4
June 1966	35.6
July 1966	6.70
August 1966	38.4
September 1966	73.4
October 1966	72.1
November 1966	73.4
December 1966	78.6
January 1967	83.4
February 1967	86.3
March 1967	88.2
April 1967	86.0
May 1967	44.1
June 1967	16.6
July 1967	29.2
August 1967	52.7
September 1967	66.8
October 1967	67.9
November 1967	69.1
December 1967	74.7
January 1968	81.1
February 1968	86.8
March 1968	81.6
April 1968	53.2
May 1968	55.3
June 1968	54.0
July 1968	35.6
August 1968	58.9
September 1968	73.8
October 1968	71.4
November 1968	73.6
December 1968	79.2
January 1969	84.1
February 1969	86.9
March 1969	79.9
April 1969	40.6
May 1969	49.0
June 1969	71.0
July 1969	46.4
August 1969	21.7
September 1969	50.1
October 1969	67.9
November 1969	82.9
December 1969	89.2
January 1970	95.6
February 1970	101
March 1970	104
April 1970	104
May 1970	98.5
June 1970	62.2
July 1970	58.2
August 1970	42.4
September 1970	46.1
October 1970	49.4
November 1970	52.4
December 1970	59.0
January 1971	65.9
February 1971	71.6
March 1971	72.9
April 1971	57.5
May 1971	15.9
June 1971	6.29
July 1971	9.97
August 1971	29.6
September 1971	38.1
October 1971	38.6
November 1971	44.2
December 1971	51.5
January 1972	58.2
February 1972	64.0
March 1972	64.4
April 1972	16.7
May 1972	5.12
June 1972	5.84
July 1972	20.8
August 1972	12.6
September 1972	63.4
October 1972	74.1
November 1972	87.4
January 1973	102
February 1973	107
March 1973	113
April 1973	128
May 1973	124
June 1973	135
July 1973	137
August 1973	135
September 1973	134
October 1973	111
November 1973	108
December 1973	114
January 1974	120
February 1974	123
March 1974	115
April 1974	87.9
May 1974	71.2
June 1974	43.7
July 1974	8.25
August 1974	13.1
September 1974	11.7
October 1974	23.2
November 1974	33.7
December 1974	40.9
January 1975	47.8
February 1975	54.2
March 1975	59.5
April 1975	61.1
May 1975	69.9
June 1975	51.7
July 1975	11.3
August 1975	18.4
September 1975	22.9
October 1975	25.9
November 1975	28.9
December 1975	36.2
January 1976	42.7
February 1976	46.4
March 1976	31.0
April 1976	5.91
May 1976	7.67
June 1976	14.5
July 1976	23.8
August 1976	11.2
September 1976	8.87
October 1976	12.7
November 1976	18.3
December 1976	26.3
January 1977	33.5
February 1977	40.0
March 1977	32.2
April 1977	8.16
May 1977	15.1
June 1977	16.0
July 1977	18.2
August 1977	13.6
September 1977	39.7
October 1977	42.7
November 1977	46.3
December 1977	43.3
January 1978	48.9
February 1978	54.8
March 1978	54.8
April 1978	9.55
May 1978	6.52
June 1978	20.6
July 1978	5.80
August 1978	5.51
September 1978	6.65
October 1978	6.92
November 1978	15.5
December 1978	25.0
January 1979	31.3
February 1979	37.0
March 1979	42.0
April 1979	46.6
May 1979	68.9
June 1979	114
July 1979	125
August 1979	124
September 1979	123
October 1979	110
November 1979	95.1
December 1979	100
January 1980	105
February 1980	109
March 1980	111
April 1980	93.6
May 1980	68.7
June 1980	61.3
July 1980	22.2
August 1980	6.03
September 1980	13.3
October 1980	15.0
November 1980	18.4
December 1980	25.2
January 1981	31.5
February 1981	37.3
March 1981	40.2
April 1981	38.3
May 1981	35.7
June 1981	6.77
July 1981	10.9
August 1981	29.0
September 1981	40.6
October 1981	41.0
November 1981	42.6
December 1981	47.5
January 1982	52.6
February 1982	57.6
March 1982	58.7
April 1982	41.3
May 1982	5.01
June 1982	8.33
July 1982	16.7
August 1982	16.2
September 1982	14.9
October 1982	22.4
November 1982	25.1
December 1982	31.2
January 1983	37.3
February 1983	43.5
March 1983	47.4
April 1983	47.0
May 1983	22.4
June 1983	18.9
July 1983	19.0
August 1983	7.92
September 1983	11.7
October 1983	7.25
November 1983	14.9
December 1983	20.8
January 1984	27.0
February 1984	32.4
March 1984	34.8
April 1984	32.2
May 1984	17.6
June 1984	13.8
July 1984	16.1
August 1984	17.2
September 1984	21.9
October 1984	26.2
November 1984	30.1
December 1984	36.9
January 1985	43.4
February 1985	49.4
March 1985	53.4
April 1985	52.2
May 1985	52.0
June 1985	46.7
July 1985	38.7
August 1985	26.6
September 1985	11.5
October 1985	23.6
November 1985	38.4
December 1985	44.1
January 1986	50.4
February 1986	58.2
March 1986	60.6
April 1986	59.0
May 1986	42.1
June 1986	35.5
July 1986	45.2
August 1986	49.4
September 1986	61.2
October 1986	62.6
November 1986	72.2
December 1986	82.5
January 1987	82.6
February 1987	82.3
March 1987	81.6
April 1987	76.8
May 1987	61.9
June 1987	63.4
July 1987	61.6
August 1987	59.5
September 1987	45.9
October 1987	42.5
November 1987	36.9
December 1987	43.6
January 1988	51.3
February 1988	56.6
March 1988	55.0
April 1988	53.5
May 1988	37.7
June 1988	24.0
July 1988	27.0
August 1988	26.2
September 1988	21.4
October 1988	23.2
November 1988	24.8
December 1988	30.9
January 1989	36.4
February 1989	39.3
March 1989	43.4
April 1989	38.9
May 1989	36.2
June 1989	20.5
July 1989	18.6
August 1989	17.1
September 1989	19.7
October 1989	18.7
November 1989	20.3
December 1989	26.1
January 1990	32.0
February 1990	35.0
March 1990	38.6
April 1990	38.4
May 1990	34.7
June 1990	18.5
July 1990	11.8
August 1990	9.92
September 1990	10.1
October 1990	10.2
November 1990	12.2
December 1990	17.3
January 1991	22.6
February 1991	24.9
March 1991	26.1
April 1991	22.9
May 1991	14.2
June 1991	5.25
July 1991	4.97
August 1991	19.6
September 1991	53.2
October 1991	52.4
November 1991	54.9
December 1991	64.0
January 1992	73.3
February 1992	77.8
March 1992	57.1
April 1992	53.7
May 1992	53.7
June 1992	53.9
July 1992	52.3
August 1992	48.1
September 1992	41.7
October 1992	21.4
November 1992	20.3
December 1992	26.3
January 1993	32.3
February 1993	37.8
March 1993	39.8
April 1993	40.2
May 1993	42.1
June 1993	50.3
July 1993	46.6
August 1993	41.4
September 1993	45.3
October 1993	26.4
November 1993	20.0
December 1993	25.8
January 1994	31.4
February 1994	36.7
March 1994	33.9
April 1994	30.3
May 1994	36.5
June 1994	54.2
July 1994	52.1
August 1994	42.8
September 1994	34.0
October 1994	17.7
November 1994	17.8
December 1994	23.5
January 1995	28.8
February 1995	28.0
March 1995	34.8
April 1995	35.6
May 1995	32.3
June 1995	29.8
July 1995	38.5
August 1995	40.2
September 1995	30.6
October 1995	31.1
November 1995	32.4
December 1995	36.0
January 1996	48.1
February 1996	52.7
March 1996	50.1
April 1996	46.5
May 1996	25.3
June 1996	15.7
July 1996	8.65
August 1996	10.3
September 1996	13.4
October 1996	25.5
November 1996	27.6
December 1996	32.6
January 1997	38.2
February 1997	43.8
March 1997	41.6
April 1997	33.1
May 1997	37.2
June 1997	44.4
July 1997	42.9
August 1997	41.8
September 1997	44.8
October 1997	43.8
November 1997	25.1
December 1997	25.8
January 1998	33.1
February 1998	48.9
March 1998	45.6
April 1998	37.7
May 1998	42.8
June 1998	34.9
July 1998	21.2
August 1998	25.8
September 1998	24.4
October 1998	12.0
November 1998	16.2
December 1998	21.7
January 1999	26.3
February 1999	30.7
March 1999	32.0
April 1999	31.0
May 1999	51.9
June 1999	51.0
July 1999	52.8
August 1999	53.4
September 1999	52.2
October 1999	38.2
November 1999	30.4
December 1999	37.3
January 2000	41.8
February 2000	35.9
March 2000	19.4
April 2000	26.9
May 2000	28.9
June 2000	32.2
July 2000	27.0
August 2000	14.4
September 2000	9.47
October 2000	11.6
November 2000	26.5
December 2000	32.3
January 2001	36.9
February 2001	40.2
March 2001	44.1
April 2001	37.7
May 2001	32.0
June 2001	41.9
July 2001	31.8
August 2001	30.4
September 2001	19.3
October 2001	13.4
November 2001	10.7
December 2001	10.3
January 2002	14.4
February 2002	17.0
March 2002	7.66
April 2002	1.85
May 2002	0.547
June 2002	1.24
July 2002	1.70
August 2002	1.04
September 2002	3.04
October 2002	4.29
November 2002	7.03
December 2002	10.8
January 2003	14.5
February 2003	17.5
March 2003	17.3
April 2003	16.0
May 2003	14.0
June 2003	9.67
July 2003	3.91
August 2003	2.72
September 2003	2.76
October 2003	6.23
November 2003	9.15
December 2003	12.6
January 2004	15.8
February 2004	21.0
March 2004	7.70
April 2004	8.00
May 2004	7.60
June 2004	4.16
July 2004	3.13
August 2004	4.24
September 2004	6.00
October 2004	16.9
November 2004	21.6
December 2004	26.6
January 2005	31.7
February 2005	36.2
March 2005	39.9
April 2005	39.4
May 2005	43.5
June 2005	53.0
July 2005	49.6
August 2005	47.0
September 2005	49.5
October 2005	47.9
November 2005	37.3
December 2005	22.2
January 2006	28.3
February 2006	29.1
March 2006	24.4
April 2006	22.5
May 2006	20.5
June 2006	15.2
July 2006	17.8
August 2006	21.5
September 2006	29.3
October 2006	27.8
November 2006	29.3
December 2006	33.4
January 2007	37.4
February 2007	41.7
March 2007	35.4
April 2007	33.2
May 2007	31.4
June 2007	28.5
July 2007	32.2
August 2007	29.3
September 2007	26.5
October 2007	23.2
November 2007	23.8
December 2007	28.1
January 2008	32.0
February 2008	34.7
March 2008	31.1
April 2008	26.6
May 2008	23.3
June 2008	20.7
July 2008	21.6
August 2008	22.0
September 2008	18.2
October 2008	15.1
November 2008	16.7
December 2008	21.5
January 2009	25.3
February 2009	28.9
March 2009	26.5
April 2009	18.7
May 2009	16.8
June 2009	12.4
July 2009	15.5
August 2009	15.7
September 2009	17.1
October 2009	19.9
November 2009	23.1
December 2009	27.5
January 2010	31.5
February 2010	35.9
March 2010	36.1
April 2010	26.6
May 2010	23.7
June 2010	19.7
July 2010	18.6
August 2010	20.6
September 2010	20.0
October 2010	19.2
November 2010	20.9
December 2010	24.7
January 2011	28.1
February 2011	30.8
March 2011	25.0
April 2011	19.8
May 2011	17.0
June 2011	12.0
July 2011	7.12
August 2011	4.93
September 2011	3.60
October 2011	2.94
November 2011	4.45
December 2011	8.78
January 2012	13.6
February 2012	17.3
March 2012	14.6
April 2012	5.40
May 2012	4.08
June 2012	5.17
July 2012	4.35
August 2012	3.80
September 2012	5.35
October 2012	5.16
November 2012	6.45
December 2012	10.0
January 2013	13.8
February 2013	17.2
March 2013	13.1
April 2013	7.01
May 2013	6.60
June 2013	5.69
July 2013	6.63
August 2013	6.39
September 2013	29.0
October 2013	39.7
November 2013	40.7
December 2013	44.5
January 2014	48.4
February 2014	52.2
March 2014	53.4
April 2014	50.7
May 2014	38.1
June 2014	35.9
July 2014	41.6
August 2014	46.9
September 2014	45.2
October 2014	45.0
November 2014	46.2
December 2014	50.0
January 2015	54.3
February 2015	57.9
March 2015	59.2
April 2015	54.2
May 2015	44.1
June 2015	42.3
July 2015	39.8
August 2015	43.3
September 2015	39.9
October 2015	38.1
November 2015	46.0
December 2015	52.1
January 2016	55.9
February 2016	56.8
March 2016	55.2
April 2016	50.7
May 2016	37.7
June 2016	38.7
July 2016	30.7
August 2016	27.2
September 2016	28.9
October 2016	23.9
November 2016	25.1
December 2016	31.1
January 2017	35.3

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	33.1	35.3
Feb	36.6	56.8
Mar	33.5	55.2
Apr	29.9	50.7
May	27.9	37.7
Jun	27.6	38.7
Jul	25.9	30.7
Aug	25.6	27.2
Sep	26.6	28.9
Oct	24.2	23.9
Nov	24.6	25.1
Dec	28.5	31.1

Rate and persistence

-1.71 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

Lake Sumner Nr Fort Sumner, NM

Gauge location

Where this comes from

615 monthly observations 1965–2017 Mm³

Spatially aggregatedHigh confidenceJanuary 2017

Source: USGS — National Water Information System, 08384000. 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.