Country: Canada
United StatesCanadaUnited Kingdom

Waterton Reservoir water level history

Daily records since 1965 · Level today: 1,178.514 m

Highest on record
1,185.930 m
Jun 28, 2005
Lowest on record
1,167.260 m
Dec 28, 2018
Today
1,178.514 m
Oct 23, 2026
Years of data
61
since 1965

In short

Across 58 complete years, 2001 had the lowest average level (1,174.951 m) and 1980 the highest (1,181.455 m).

On average the lake is lowest in October (1,177.081 m) and highest in July (1,183.338 m).

Waterton Reservoir level, all years

Loading chart…

Measured Normal range for the date (middle 50% of past years)

Each year's lowest and highest level

1,1661,1711,1771,1821,1871965197319811989199720052013202120261965: lowest 1,177.52 m (1965-12-31), highest 1,181.50 m (1965-06-17), average 1,179.83 m, 214 days measured1966: lowest 1,175.87 m (1966-03-11), highest 1,181.27 m (1966-06-04), average 1,179.24 m, 352 days measured1967: lowest 1,179.49 m (1967-08-10), highest 1,181.20 m (1967-11-14), average 1,180.29 m, 365 days measured1968: lowest 1,173.54 m (1968-12-31), highest 1,182.78 m (1968-07-13), average 1,180.55 m, 366 days measured1969: lowest 1,169.03 m (1969-02-26), highest 1,184.79 m (1969-08-15), average 1,179.97 m, 280 days measured1970: lowest 1,179.81 m (1970-01-14), highest 1,185.09 m (1970-07-15), average 1,180.91 m, 347 days measured1971: lowest 1,179.77 m (1971-02-23), highest 1,185.08 m (1971-07-17), average 1,181.03 m, 323 days measured1972: lowest 1,179.83 m (1972-12-04), highest 1,184.78 m (1972-08-29), average 1,181.17 m, 336 days measured1973: lowest 1,178.70 m (1973-09-24), highest 1,184.66 m (1973-07-10), average 1,180.61 m, 365 days measured1974: lowest 1,178.87 m (1974-10-29), highest 1,184.66 m (1974-08-14), average 1,181.13 m, 365 days measured1975: lowest 1,179.78 m (1975-03-28), highest 1,185.18 m (1975-07-30), average 1,181.42 m, 362 days measured1976: lowest 1,179.83 m (1976-12-23), highest 1,184.34 m (1976-08-09), average 1,181.44 m, 366 days measured1977: lowest 1,171.35 m (1977-10-20), highest 1,181.54 m (1977-04-25), average 1,176.68 m, 342 days measured1978: lowest 1,175.16 m (1978-01-01), highest 1,184.42 m (1978-07-22), average 1,180.43 m, 365 days measured1979: lowest 1,175.56 m (1979-10-22), highest 1,183.29 m (1979-07-07), average 1,179.32 m, 365 days measured1980: lowest 1,176.79 m (1980-01-01), highest 1,185.27 m (1980-05-23), average 1,181.45 m, 366 days measured1981: lowest 1,170.60 m (1981-11-06), highest 1,184.76 m (1981-05-23), average 1,179.56 m, 365 days measured1982: lowest 1,172.06 m (1982-01-01), highest 1,184.73 m (1982-07-29), average 1,178.38 m, 365 days measured1983: lowest 1,178.20 m (1983-05-09), highest 1,184.19 m (1983-06-21), average 1,180.49 m, 365 days measured1984: lowest 1,171.60 m (1984-10-22), highest 1,184.56 m (1984-07-01), average 1,178.04 m, 366 days measured1985: lowest 1,175.22 m (1985-09-05), highest 1,184.39 m (1985-06-23), average 1,178.66 m, 365 days measured1986: lowest 1,173.30 m (1986-10-14), highest 1,184.72 m (1986-06-20), average 1,179.72 m, 365 days measured1987: lowest 1,170.24 m (1987-10-26), highest 1,184.73 m (1987-06-02), average 1,178.98 m, 365 days measured1988: lowest 1,172.03 m (1988-01-01), highest 1,182.83 m (1988-06-13), average 1,176.33 m, 366 days measured1989: lowest 1,176.41 m (1989-05-05), highest 1,184.43 m (1989-06-28), average 1,179.93 m, 365 days measured1990: lowest 1,170.25 m (1990-11-01), highest 1,184.82 m (1990-07-13), average 1,178.79 m, 365 days measured1991: lowest 1,174.77 m (1991-01-01), highest 1,184.90 m (1991-07-12), average 1,180.09 m, 345 days measured1992: lowest 1,173.76 m (1992-05-20), highest 1,181.94 m (1992-07-20), average 1,179.48 m, 366 days measured1993: lowest 1,177.52 m (1993-05-04), highest 1,184.70 m (1993-06-17), average 1,181.21 m, 365 days measured1994: lowest 1,170.48 m (1994-10-17), highest 1,184.42 m (1994-06-08), average 1,178.52 m, 365 days measured1995: lowest 1,173.78 m (1995-01-01), highest 1,184.59 m (1995-06-07), average 1,179.64 m, 365 days measured1996: lowest 1,179.74 m (1996-09-24), highest 1,184.66 m (1996-07-05), average 1,181.05 m, 366 days measured1997: lowest 1,176.28 m (1997-10-20), highest 1,184.88 m (1997-07-08), average 1,180.42 m, 365 days measured1998: lowest 1,169.84 m (1998-12-10), highest 1,185.09 m (1998-06-18), average 1,177.71 m, 365 days measured1999: lowest 1,169.74 m (1999-02-23), highest 1,185.31 m (1999-06-27), average 1,176.97 m, 365 days measured2000: lowest 1,171.82 m (2000-10-09), highest 1,179.86 m (2000-02-24), average 1,176.47 m, 366 days measured2001: lowest 1,171.14 m (2001-10-18), highest 1,185.21 m (2001-06-20), average 1,174.95 m, 365 days measured2002: lowest 1,171.80 m (2002-01-01), highest 1,185.60 m (2002-06-19), average 1,178.08 m, 365 days measured2003: lowest 1,171.36 m (2003-10-10), highest 1,183.85 m (2003-06-25), average 1,176.71 m, 365 days measured2004: lowest 1,173.74 m (2004-01-08), highest 1,185.61 m (2004-07-01), average 1,179.27 m, 366 days measured2005: lowest 1,178.76 m (2005-09-10), highest 1,185.93 m (2005-06-28), average 1,181.11 m, 365 days measured2006: lowest 1,176.37 m (2006-10-06), highest 1,185.31 m (2006-07-05), average 1,180.64 m, 365 days measured2007: lowest 1,170.95 m (2007-10-27), highest 1,184.86 m (2007-06-27), average 1,178.31 m, 365 days measured2008: lowest 1,172.60 m (2008-04-12), highest 1,184.90 m (2008-06-23), average 1,176.56 m, 366 days measured2009: lowest 1,175.52 m (2009-03-18), highest 1,185.04 m (2009-07-05), average 1,179.22 m, 365 days measured2010: lowest 1,175.94 m (2010-03-04), highest 1,185.04 m (2010-06-18), average 1,180.20 m, 365 days measured2011: lowest 1,177.74 m (2011-10-04), highest 1,185.09 m (2011-07-09), average 1,180.68 m, 365 days measured2012: lowest 1,176.33 m (2012-10-05), highest 1,184.96 m (2012-07-09), average 1,180.30 m, 345 days measured2013: lowest 1,178.53 m (2013-10-10), highest 1,184.87 m (2013-06-21), average 1,180.88 m, 365 days measured2014: lowest 1,178.80 m (2014-10-07), highest 1,184.95 m (2014-06-19), average 1,180.99 m, 365 days measured2015: lowest 1,169.41 m (2015-11-13), highest 1,185.02 m (2015-06-07), average 1,177.93 m, 348 days measured2016: lowest 1,173.08 m (2016-01-01), highest 1,184.98 m (2016-07-01), average 1,179.40 m, 366 days measured2017: lowest 1,171.57 m (2017-10-07), highest 1,185.05 m (2017-06-27), average 1,179.09 m, 365 days measured2018: lowest 1,167.26 m (2018-12-28), highest 1,185.18 m (2018-06-20), average 1,177.60 m, 365 days measured2019: lowest 1,167.26 m (2019-01-02), highest 1,185.09 m (2019-06-17), average 1,176.62 m, 365 days measured2020: lowest 1,176.42 m (2020-10-09), highest 1,185.04 m (2020-06-15), average 1,180.59 m, 366 days measured2021: lowest 1,169.58 m (2021-10-22), highest 1,185.58 m (2021-06-20), average 1,178.95 m, 365 days measured2022: lowest 1,173.18 m (2022-10-07), highest 1,185.28 m (2022-06-22), average 1,179.02 m, 365 days measured2023: lowest 1,174.35 m (2023-01-01), highest 1,184.96 m (2023-05-25), average 1,178.26 m, 365 days measured2024: lowest 1,174.26 m (2024-04-30), highest 1,185.05 m (2024-06-28), average 1,179.84 m, 366 days measured2025: lowest 1,174.83 m (2025-10-10), highest 1,185.05 m (2025-07-24), average 1,179.03 m, 365 days measured2026: lowest 1,177.84 m (2026-10-09), highest 1,178.85 m (2026-09-22), average 1,178.31 m, 30 days measured
1,1661,1711,1771,1821,187196519811997201320261965: lowest 1,177.52 m (1965-12-31), highest 1,181.50 m (1965-06-17), average 1,179.83 m, 214 days measured1966: lowest 1,175.87 m (1966-03-11), highest 1,181.27 m (1966-06-04), average 1,179.24 m, 352 days measured1967: lowest 1,179.49 m (1967-08-10), highest 1,181.20 m (1967-11-14), average 1,180.29 m, 365 days measured1968: lowest 1,173.54 m (1968-12-31), highest 1,182.78 m (1968-07-13), average 1,180.55 m, 366 days measured1969: lowest 1,169.03 m (1969-02-26), highest 1,184.79 m (1969-08-15), average 1,179.97 m, 280 days measured1970: lowest 1,179.81 m (1970-01-14), highest 1,185.09 m (1970-07-15), average 1,180.91 m, 347 days measured1971: lowest 1,179.77 m (1971-02-23), highest 1,185.08 m (1971-07-17), average 1,181.03 m, 323 days measured1972: lowest 1,179.83 m (1972-12-04), highest 1,184.78 m (1972-08-29), average 1,181.17 m, 336 days measured1973: lowest 1,178.70 m (1973-09-24), highest 1,184.66 m (1973-07-10), average 1,180.61 m, 365 days measured1974: lowest 1,178.87 m (1974-10-29), highest 1,184.66 m (1974-08-14), average 1,181.13 m, 365 days measured1975: lowest 1,179.78 m (1975-03-28), highest 1,185.18 m (1975-07-30), average 1,181.42 m, 362 days measured1976: lowest 1,179.83 m (1976-12-23), highest 1,184.34 m (1976-08-09), average 1,181.44 m, 366 days measured1977: lowest 1,171.35 m (1977-10-20), highest 1,181.54 m (1977-04-25), average 1,176.68 m, 342 days measured1978: lowest 1,175.16 m (1978-01-01), highest 1,184.42 m (1978-07-22), average 1,180.43 m, 365 days measured1979: lowest 1,175.56 m (1979-10-22), highest 1,183.29 m (1979-07-07), average 1,179.32 m, 365 days measured1980: lowest 1,176.79 m (1980-01-01), highest 1,185.27 m (1980-05-23), average 1,181.45 m, 366 days measured1981: lowest 1,170.60 m (1981-11-06), highest 1,184.76 m (1981-05-23), average 1,179.56 m, 365 days measured1982: lowest 1,172.06 m (1982-01-01), highest 1,184.73 m (1982-07-29), average 1,178.38 m, 365 days measured1983: lowest 1,178.20 m (1983-05-09), highest 1,184.19 m (1983-06-21), average 1,180.49 m, 365 days measured1984: lowest 1,171.60 m (1984-10-22), highest 1,184.56 m (1984-07-01), average 1,178.04 m, 366 days measured1985: lowest 1,175.22 m (1985-09-05), highest 1,184.39 m (1985-06-23), average 1,178.66 m, 365 days measured1986: lowest 1,173.30 m (1986-10-14), highest 1,184.72 m (1986-06-20), average 1,179.72 m, 365 days measured1987: lowest 1,170.24 m (1987-10-26), highest 1,184.73 m (1987-06-02), average 1,178.98 m, 365 days measured1988: lowest 1,172.03 m (1988-01-01), highest 1,182.83 m (1988-06-13), average 1,176.33 m, 366 days measured1989: lowest 1,176.41 m (1989-05-05), highest 1,184.43 m (1989-06-28), average 1,179.93 m, 365 days measured1990: lowest 1,170.25 m (1990-11-01), highest 1,184.82 m (1990-07-13), average 1,178.79 m, 365 days measured1991: lowest 1,174.77 m (1991-01-01), highest 1,184.90 m (1991-07-12), average 1,180.09 m, 345 days measured1992: lowest 1,173.76 m (1992-05-20), highest 1,181.94 m (1992-07-20), average 1,179.48 m, 366 days measured1993: lowest 1,177.52 m (1993-05-04), highest 1,184.70 m (1993-06-17), average 1,181.21 m, 365 days measured1994: lowest 1,170.48 m (1994-10-17), highest 1,184.42 m (1994-06-08), average 1,178.52 m, 365 days measured1995: lowest 1,173.78 m (1995-01-01), highest 1,184.59 m (1995-06-07), average 1,179.64 m, 365 days measured1996: lowest 1,179.74 m (1996-09-24), highest 1,184.66 m (1996-07-05), average 1,181.05 m, 366 days measured1997: lowest 1,176.28 m (1997-10-20), highest 1,184.88 m (1997-07-08), average 1,180.42 m, 365 days measured1998: lowest 1,169.84 m (1998-12-10), highest 1,185.09 m (1998-06-18), average 1,177.71 m, 365 days measured1999: lowest 1,169.74 m (1999-02-23), highest 1,185.31 m (1999-06-27), average 1,176.97 m, 365 days measured2000: lowest 1,171.82 m (2000-10-09), highest 1,179.86 m (2000-02-24), average 1,176.47 m, 366 days measured2001: lowest 1,171.14 m (2001-10-18), highest 1,185.21 m (2001-06-20), average 1,174.95 m, 365 days measured2002: lowest 1,171.80 m (2002-01-01), highest 1,185.60 m (2002-06-19), average 1,178.08 m, 365 days measured2003: lowest 1,171.36 m (2003-10-10), highest 1,183.85 m (2003-06-25), average 1,176.71 m, 365 days measured2004: lowest 1,173.74 m (2004-01-08), highest 1,185.61 m (2004-07-01), average 1,179.27 m, 366 days measured2005: lowest 1,178.76 m (2005-09-10), highest 1,185.93 m (2005-06-28), average 1,181.11 m, 365 days measured2006: lowest 1,176.37 m (2006-10-06), highest 1,185.31 m (2006-07-05), average 1,180.64 m, 365 days measured2007: lowest 1,170.95 m (2007-10-27), highest 1,184.86 m (2007-06-27), average 1,178.31 m, 365 days measured2008: lowest 1,172.60 m (2008-04-12), highest 1,184.90 m (2008-06-23), average 1,176.56 m, 366 days measured2009: lowest 1,175.52 m (2009-03-18), highest 1,185.04 m (2009-07-05), average 1,179.22 m, 365 days measured2010: lowest 1,175.94 m (2010-03-04), highest 1,185.04 m (2010-06-18), average 1,180.20 m, 365 days measured2011: lowest 1,177.74 m (2011-10-04), highest 1,185.09 m (2011-07-09), average 1,180.68 m, 365 days measured2012: lowest 1,176.33 m (2012-10-05), highest 1,184.96 m (2012-07-09), average 1,180.30 m, 345 days measured2013: lowest 1,178.53 m (2013-10-10), highest 1,184.87 m (2013-06-21), average 1,180.88 m, 365 days measured2014: lowest 1,178.80 m (2014-10-07), highest 1,184.95 m (2014-06-19), average 1,180.99 m, 365 days measured2015: lowest 1,169.41 m (2015-11-13), highest 1,185.02 m (2015-06-07), average 1,177.93 m, 348 days measured2016: lowest 1,173.08 m (2016-01-01), highest 1,184.98 m (2016-07-01), average 1,179.40 m, 366 days measured2017: lowest 1,171.57 m (2017-10-07), highest 1,185.05 m (2017-06-27), average 1,179.09 m, 365 days measured2018: lowest 1,167.26 m (2018-12-28), highest 1,185.18 m (2018-06-20), average 1,177.60 m, 365 days measured2019: lowest 1,167.26 m (2019-01-02), highest 1,185.09 m (2019-06-17), average 1,176.62 m, 365 days measured2020: lowest 1,176.42 m (2020-10-09), highest 1,185.04 m (2020-06-15), average 1,180.59 m, 366 days measured2021: lowest 1,169.58 m (2021-10-22), highest 1,185.58 m (2021-06-20), average 1,178.95 m, 365 days measured2022: lowest 1,173.18 m (2022-10-07), highest 1,185.28 m (2022-06-22), average 1,179.02 m, 365 days measured2023: lowest 1,174.35 m (2023-01-01), highest 1,184.96 m (2023-05-25), average 1,178.26 m, 365 days measured2024: lowest 1,174.26 m (2024-04-30), highest 1,185.05 m (2024-06-28), average 1,179.84 m, 366 days measured2025: lowest 1,174.83 m (2025-10-10), highest 1,185.05 m (2025-07-24), average 1,179.03 m, 365 days measured2026: lowest 1,177.84 m (2026-10-09), highest 1,178.85 m (2026-09-22), average 1,178.31 m, 30 days measured
Lowest to highest that yearYear average2026 so far

One bar per year from the lowest to the highest daily level, with the year's average. Years with no bar have no daily record in the agency archive.

Lowest years

Years ranked by their lowest daily level.

  • 20191,167.260 m on Jan 2
  • 20181,167.260 m on Dec 28
  • 20151,169.410 m on Nov 13
  • 20211,169.580 m on Oct 22
  • 19991,169.740 m on Feb 23

Yearly highs and lows

YearAverageLowLow dateHighHigh date
2026 (30 days)1,178.3111,177.837Oct 91,178.850Sep 22
20251,179.0341,174.830Oct 101,185.050Jul 24
20241,179.8421,174.260Apr 301,185.050Jun 28
20231,178.2621,174.350Jan 11,184.960May 25
20221,179.0241,173.180Oct 71,185.280Jun 22
20211,178.9531,169.580Oct 221,185.580Jun 20
20201,180.5921,176.420Oct 91,185.040Jun 15
20191,176.6231,167.260Jan 21,185.090Jun 17
20181,177.6001,167.260Dec 281,185.180Jun 20
20171,179.0941,171.570Oct 71,185.050Jun 27
20161,179.3971,173.080Jan 11,184.980Jul 1
20151,177.9261,169.410Nov 131,185.020Jun 7
20141,180.9941,178.800Oct 71,184.950Jun 19
20131,180.8841,178.530Oct 101,184.870Jun 21
20121,180.3011,176.330Oct 51,184.960Jul 9
20111,180.6781,177.740Oct 41,185.090Jul 9
20101,180.2031,175.940Mar 41,185.040Jun 18
20091,179.2241,175.520Mar 181,185.040Jul 5
20081,176.5641,172.600Apr 121,184.900Jun 23
20071,178.3081,170.950Oct 271,184.860Jun 27
20061,180.6361,176.370Oct 61,185.310Jul 5
20051,181.1071,178.760Sep 101,185.930Jun 28
20041,179.2711,173.740Jan 81,185.610Jul 1
20031,176.7141,171.360Oct 101,183.850Jun 25
20021,178.0811,171.800Jan 11,185.600Jun 19
20011,174.9511,171.140Oct 181,185.210Jun 20
20001,176.4751,171.820Oct 91,179.860Feb 24
19991,176.9671,169.740Feb 231,185.310Jun 27
19981,177.7081,169.840Dec 101,185.090Jun 18
19971,180.4171,176.280Oct 201,184.880Jul 8
19961,181.0511,179.740Sep 241,184.660Jul 5
19951,179.6381,173.780Jan 11,184.590Jun 7
19941,178.5211,170.480Oct 171,184.420Jun 8
19931,181.2121,177.520May 41,184.700Jun 17
19921,179.4771,173.760May 201,181.940Jul 20
19911,180.0921,174.770Jan 11,184.900Jul 12
19901,178.7851,170.250Nov 11,184.820Jul 13
19891,179.9341,176.410May 51,184.430Jun 28
19881,176.3251,172.030Jan 11,182.830Jun 13
19871,178.9801,170.240Oct 261,184.730Jun 2
19861,179.7171,173.300Oct 141,184.720Jun 20
19851,178.6611,175.220Sep 51,184.390Jun 23
19841,178.0371,171.600Oct 221,184.560Jul 1
19831,180.4861,178.200May 91,184.190Jun 21
19821,178.3801,172.060Jan 11,184.730Jul 29
19811,179.5611,170.600Nov 61,184.760May 23
19801,181.4551,176.790Jan 11,185.270May 23
19791,179.3251,175.560Oct 221,183.290Jul 7
19781,180.4311,175.160Jan 11,184.420Jul 22
19771,176.6801,171.350Oct 201,181.540Apr 25
19761,181.4381,179.830Dec 231,184.340Aug 9
19751,181.4201,179.780Mar 281,185.180Jul 30
19741,181.1321,178.870Oct 291,184.660Aug 14
19731,180.6121,178.700Sep 241,184.660Jul 10
19721,181.1721,179.830Dec 41,184.780Aug 29
1971 (323 days)1,181.0311,179.770Feb 231,185.080Jul 17
19701,180.9081,179.810Jan 141,185.090Jul 15
1969 (280 days)1,179.9671,169.030Feb 261,184.790Aug 15
19681,180.5461,173.540Dec 311,182.780Jul 13
19671,180.2891,179.490Aug 101,181.200Nov 14
19661,179.2391,175.870Mar 111,181.270Jun 4
1965 (214 days)1,179.8251,177.520Dec 311,181.500Jun 17

Levels in metres. Partial years show the number of days with data.

Monthly averages

MonthAverageLowestHighest
January1,177.8371,167.2601,180.230
February1,177.9231,167.2701,180.350
March1,178.0951,167.3301,181.310
April1,178.5281,168.5301,182.100
May1,180.3301,172.3201,185.270
June1,183.0511,175.0301,185.930
July1,183.3381,175.3901,185.630
August1,181.5901,174.3501,185.410
September1,179.1891,171.2601,184.560
October1,177.0811,169.0801,184.020
November1,177.2561,167.9401,182.640
December1,177.6501,167.2601,180.600

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Daily levels as CSV (21,887 rows; credit the original agencies listed below)