Country: Canada
United StatesCanadaUnited Kingdom

Last Mountain Lake water level history

Daily records since 1965 · Level today: 490.150 m

Highest on record
491.970 m
May 12, 2011
Lowest on record
489.326 m
May 13, 1965
Today
490.150 m
Oct 23, 2026
Years of data
61
since 1965

In short

Across 51 complete years, 1989 had the lowest average level (489.467 m) and 2011 the highest (490.944 m).

On average the lake is lowest in February (489.884 m) and highest in June (490.340 m).

Last Mountain Lake level, all years

Loading chart…

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

Each year's lowest and highest level

489.2489.9490.6491.4492.11965197319811989199720052013202120261965: lowest 489.33 m (1965-05-13), highest 489.66 m (1965-07-13), average 489.50 m, 19 days measured1966: lowest 489.55 m (1966-09-23), highest 489.90 m (1966-06-25), average 489.70 m, 108 days measured1967: lowest 489.65 m (1967-09-11), highest 490.00 m (1967-06-23), average 489.82 m, 100 days measured1968: lowest 489.72 m (1968-10-15), highest 489.91 m (1968-05-30), average 489.84 m, 111 days measured1969: lowest 490.35 m (1969-09-30), highest 490.75 m (1969-06-06), average 490.61 m, 136 days measured1970: lowest 490.66 m (1970-09-17), highest 491.12 m (1970-06-12), average 490.92 m, 86 days measured1971: lowest 490.18 m (1971-12-28), highest 490.85 m (1971-07-24), average 490.48 m, 365 days measured1972: lowest 489.82 m (1972-12-16), highest 490.36 m (1972-05-27), average 490.11 m, 366 days measured1973: lowest 489.70 m (1973-11-30), highest 490.11 m (1973-06-04), average 489.87 m, 357 days measured1974: lowest 489.70 m (1974-01-09), highest 491.87 m (1974-06-10), average 490.75 m, 312 days measured1975: lowest 490.04 m (1975-12-23), highest 491.06 m (1975-05-20), average 490.47 m, 365 days measured1976: lowest 490.00 m (1976-12-29), highest 491.09 m (1976-05-12), average 490.42 m, 366 days measured1977: lowest 489.67 m (1977-11-11), highest 490.05 m (1977-05-31), average 489.89 m, 365 days measured1978: lowest 489.61 m (1978-11-16), highest 489.97 m (1978-05-31), average 489.77 m, 365 days measured1979: lowest 489.61 m (1979-01-04), highest 490.55 m (1979-05-29), average 490.02 m, 365 days measured1980: lowest 489.59 m (1980-11-27), highest 490.07 m (1980-04-26), average 489.83 m, 366 days measured1981: lowest 489.59 m (1981-11-20), highest 489.75 m (1981-08-05), average 489.65 m, 365 days measured1982: lowest 489.62 m (1982-01-01), highest 490.78 m (1982-06-23), average 490.27 m, 365 days measured1983: lowest 490.06 m (1983-03-19), highest 490.64 m (1983-08-04), average 490.29 m, 365 days measured1984: lowest 489.64 m (1984-10-25), highest 490.19 m (1984-04-27), average 489.92 m, 366 days measured1985: lowest 489.69 m (1985-01-01), highest 490.50 m (1985-05-18), average 490.04 m, 365 days measured1986: lowest 489.81 m (1986-02-20), highest 490.25 m (1986-06-05), average 490.02 m, 365 days measured1987: lowest 489.80 m (1987-11-20), highest 490.02 m (1987-07-31), average 489.93 m, 365 days measured1988: lowest 489.36 m (1988-11-06), highest 489.90 m (1988-05-07), average 489.67 m, 366 days measured1989: lowest 489.38 m (1989-01-01), highest 489.61 m (1989-06-26), average 489.47 m, 365 days measured1990: lowest 489.45 m (1990-01-01), highest 489.93 m (1990-07-28), average 489.70 m, 365 days measured1991: lowest 489.65 m (1991-01-03), highest 490.23 m (1991-07-17), average 489.87 m, 365 days measured1992: lowest 489.72 m (1992-12-19), highest 490.08 m (1992-06-11), average 489.90 m, 366 days measured1993: lowest 489.71 m (1993-01-24), highest 490.21 m (1993-09-12), average 489.90 m, 365 days measured1994: lowest 489.83 m (1994-12-27), highest 490.61 m (1994-04-23), average 490.14 m, 365 days measured1995: lowest 489.82 m (1995-03-01), highest 490.29 m (1995-06-28), average 490.04 m, 365 days measured1996: lowest 489.87 m (1996-01-06), highest 490.99 m (1996-05-17), average 490.27 m, 366 days measured1997: lowest 489.89 m (1997-12-31), highest 491.03 m (1997-05-13), average 490.31 m, 365 days measured1998: lowest 489.88 m (1998-12-23), highest 490.30 m (1998-07-11), average 490.02 m, 365 days measured1999: lowest 489.88 m (1999-12-31), highest 490.77 m (1999-05-24), average 490.29 m, 324 days measured2000: lowest 489.78 m (2000-12-13), highest 490.17 m (2000-08-03), average 489.94 m, 366 days measured2001: lowest 489.72 m (2001-12-16), highest 490.13 m (2001-05-20), average 489.91 m, 261 days measured2002: lowest 489.73 m (2002-01-04), highest 490.11 m (2002-09-07), average 489.93 m, 309 days measured2003: lowest 489.86 m (2003-12-22), highest 490.45 m (2003-05-09), average 490.10 m, 365 days measured2004: lowest 489.81 m (2004-12-23), highest 490.31 m (2004-06-17), average 490.01 m, 366 days measured2005: lowest 489.82 m (2005-01-17), highest 490.40 m (2005-04-27), average 490.07 m, 365 days measured2006: lowest 489.88 m (2006-03-26), highest 490.64 m (2006-05-03), average 490.11 m, 365 days measured2007: lowest 489.84 m (2007-12-31), highest 490.63 m (2007-05-23), average 490.12 m, 365 days measured2008: lowest 489.75 m (2008-11-10), highest 490.12 m (2008-06-15), average 489.91 m, 366 days measured2009: lowest 489.80 m (2009-01-01), highest 490.30 m (2009-05-13), average 490.03 m, 365 days measured2010: lowest 489.92 m (2010-01-19), highest 490.99 m (2010-07-06), average 490.41 m, 365 days measured2011: lowest 490.20 m (2011-03-31), highest 491.97 m (2011-05-12), average 490.94 m, 365 days measured2012: lowest 489.83 m (2012-11-05), highest 490.39 m (2012-05-28), average 490.14 m, 366 days measured2013: lowest 489.89 m (2013-01-03), highest 490.65 m (2013-05-31), average 490.14 m, 365 days measured2014: lowest 489.95 m (2014-01-02), highest 491.56 m (2014-07-13), average 490.65 m, 365 days measured2015: lowest 490.03 m (2015-12-31), highest 491.41 m (2015-04-19), average 490.55 m, 365 days measured2016: lowest 489.91 m (2016-12-28), highest 490.35 m (2016-05-31), average 490.12 m, 366 days measured2017: lowest 489.80 m (2017-11-10), highest 490.29 m (2017-05-11), average 490.00 m, 365 days measured2018: lowest 489.81 m (2018-11-09), highest 490.35 m (2018-06-08), average 489.98 m, 365 days measured2019: lowest 489.85 m (2019-01-01), highest 490.09 m (2019-07-30), average 489.95 m, 365 days measured2020: lowest 489.64 m (2020-11-01), highest 490.12 m (2020-07-11), average 489.87 m, 366 days measured2021: lowest 489.51 m (2021-11-25), highest 489.91 m (2021-06-17), average 489.69 m, 365 days measured2022: lowest 489.54 m (2022-01-01), highest 490.31 m (2022-05-30), average 489.95 m, 365 days measured2023: lowest 489.87 m (2023-12-13), highest 490.64 m (2023-05-13), average 490.11 m, 365 days measured2024: lowest 489.84 m (2024-11-11), highest 490.31 m (2024-06-05), average 490.04 m, 345 days measured2025: lowest 489.89 m (2025-01-28), highest 490.34 m (2025-05-16), average 490.06 m, 365 days measured2026: lowest 490.14 m (2026-10-21), highest 490.31 m (2026-09-24), average 490.24 m, 30 days measured
489.2489.9490.6491.4492.1196519811997201320261965: lowest 489.33 m (1965-05-13), highest 489.66 m (1965-07-13), average 489.50 m, 19 days measured1966: lowest 489.55 m (1966-09-23), highest 489.90 m (1966-06-25), average 489.70 m, 108 days measured1967: lowest 489.65 m (1967-09-11), highest 490.00 m (1967-06-23), average 489.82 m, 100 days measured1968: lowest 489.72 m (1968-10-15), highest 489.91 m (1968-05-30), average 489.84 m, 111 days measured1969: lowest 490.35 m (1969-09-30), highest 490.75 m (1969-06-06), average 490.61 m, 136 days measured1970: lowest 490.66 m (1970-09-17), highest 491.12 m (1970-06-12), average 490.92 m, 86 days measured1971: lowest 490.18 m (1971-12-28), highest 490.85 m (1971-07-24), average 490.48 m, 365 days measured1972: lowest 489.82 m (1972-12-16), highest 490.36 m (1972-05-27), average 490.11 m, 366 days measured1973: lowest 489.70 m (1973-11-30), highest 490.11 m (1973-06-04), average 489.87 m, 357 days measured1974: lowest 489.70 m (1974-01-09), highest 491.87 m (1974-06-10), average 490.75 m, 312 days measured1975: lowest 490.04 m (1975-12-23), highest 491.06 m (1975-05-20), average 490.47 m, 365 days measured1976: lowest 490.00 m (1976-12-29), highest 491.09 m (1976-05-12), average 490.42 m, 366 days measured1977: lowest 489.67 m (1977-11-11), highest 490.05 m (1977-05-31), average 489.89 m, 365 days measured1978: lowest 489.61 m (1978-11-16), highest 489.97 m (1978-05-31), average 489.77 m, 365 days measured1979: lowest 489.61 m (1979-01-04), highest 490.55 m (1979-05-29), average 490.02 m, 365 days measured1980: lowest 489.59 m (1980-11-27), highest 490.07 m (1980-04-26), average 489.83 m, 366 days measured1981: lowest 489.59 m (1981-11-20), highest 489.75 m (1981-08-05), average 489.65 m, 365 days measured1982: lowest 489.62 m (1982-01-01), highest 490.78 m (1982-06-23), average 490.27 m, 365 days measured1983: lowest 490.06 m (1983-03-19), highest 490.64 m (1983-08-04), average 490.29 m, 365 days measured1984: lowest 489.64 m (1984-10-25), highest 490.19 m (1984-04-27), average 489.92 m, 366 days measured1985: lowest 489.69 m (1985-01-01), highest 490.50 m (1985-05-18), average 490.04 m, 365 days measured1986: lowest 489.81 m (1986-02-20), highest 490.25 m (1986-06-05), average 490.02 m, 365 days measured1987: lowest 489.80 m (1987-11-20), highest 490.02 m (1987-07-31), average 489.93 m, 365 days measured1988: lowest 489.36 m (1988-11-06), highest 489.90 m (1988-05-07), average 489.67 m, 366 days measured1989: lowest 489.38 m (1989-01-01), highest 489.61 m (1989-06-26), average 489.47 m, 365 days measured1990: lowest 489.45 m (1990-01-01), highest 489.93 m (1990-07-28), average 489.70 m, 365 days measured1991: lowest 489.65 m (1991-01-03), highest 490.23 m (1991-07-17), average 489.87 m, 365 days measured1992: lowest 489.72 m (1992-12-19), highest 490.08 m (1992-06-11), average 489.90 m, 366 days measured1993: lowest 489.71 m (1993-01-24), highest 490.21 m (1993-09-12), average 489.90 m, 365 days measured1994: lowest 489.83 m (1994-12-27), highest 490.61 m (1994-04-23), average 490.14 m, 365 days measured1995: lowest 489.82 m (1995-03-01), highest 490.29 m (1995-06-28), average 490.04 m, 365 days measured1996: lowest 489.87 m (1996-01-06), highest 490.99 m (1996-05-17), average 490.27 m, 366 days measured1997: lowest 489.89 m (1997-12-31), highest 491.03 m (1997-05-13), average 490.31 m, 365 days measured1998: lowest 489.88 m (1998-12-23), highest 490.30 m (1998-07-11), average 490.02 m, 365 days measured1999: lowest 489.88 m (1999-12-31), highest 490.77 m (1999-05-24), average 490.29 m, 324 days measured2000: lowest 489.78 m (2000-12-13), highest 490.17 m (2000-08-03), average 489.94 m, 366 days measured2001: lowest 489.72 m (2001-12-16), highest 490.13 m (2001-05-20), average 489.91 m, 261 days measured2002: lowest 489.73 m (2002-01-04), highest 490.11 m (2002-09-07), average 489.93 m, 309 days measured2003: lowest 489.86 m (2003-12-22), highest 490.45 m (2003-05-09), average 490.10 m, 365 days measured2004: lowest 489.81 m (2004-12-23), highest 490.31 m (2004-06-17), average 490.01 m, 366 days measured2005: lowest 489.82 m (2005-01-17), highest 490.40 m (2005-04-27), average 490.07 m, 365 days measured2006: lowest 489.88 m (2006-03-26), highest 490.64 m (2006-05-03), average 490.11 m, 365 days measured2007: lowest 489.84 m (2007-12-31), highest 490.63 m (2007-05-23), average 490.12 m, 365 days measured2008: lowest 489.75 m (2008-11-10), highest 490.12 m (2008-06-15), average 489.91 m, 366 days measured2009: lowest 489.80 m (2009-01-01), highest 490.30 m (2009-05-13), average 490.03 m, 365 days measured2010: lowest 489.92 m (2010-01-19), highest 490.99 m (2010-07-06), average 490.41 m, 365 days measured2011: lowest 490.20 m (2011-03-31), highest 491.97 m (2011-05-12), average 490.94 m, 365 days measured2012: lowest 489.83 m (2012-11-05), highest 490.39 m (2012-05-28), average 490.14 m, 366 days measured2013: lowest 489.89 m (2013-01-03), highest 490.65 m (2013-05-31), average 490.14 m, 365 days measured2014: lowest 489.95 m (2014-01-02), highest 491.56 m (2014-07-13), average 490.65 m, 365 days measured2015: lowest 490.03 m (2015-12-31), highest 491.41 m (2015-04-19), average 490.55 m, 365 days measured2016: lowest 489.91 m (2016-12-28), highest 490.35 m (2016-05-31), average 490.12 m, 366 days measured2017: lowest 489.80 m (2017-11-10), highest 490.29 m (2017-05-11), average 490.00 m, 365 days measured2018: lowest 489.81 m (2018-11-09), highest 490.35 m (2018-06-08), average 489.98 m, 365 days measured2019: lowest 489.85 m (2019-01-01), highest 490.09 m (2019-07-30), average 489.95 m, 365 days measured2020: lowest 489.64 m (2020-11-01), highest 490.12 m (2020-07-11), average 489.87 m, 366 days measured2021: lowest 489.51 m (2021-11-25), highest 489.91 m (2021-06-17), average 489.69 m, 365 days measured2022: lowest 489.54 m (2022-01-01), highest 490.31 m (2022-05-30), average 489.95 m, 365 days measured2023: lowest 489.87 m (2023-12-13), highest 490.64 m (2023-05-13), average 490.11 m, 365 days measured2024: lowest 489.84 m (2024-11-11), highest 490.31 m (2024-06-05), average 490.04 m, 345 days measured2025: lowest 489.89 m (2025-01-28), highest 490.34 m (2025-05-16), average 490.06 m, 365 days measured2026: lowest 490.14 m (2026-10-21), highest 490.31 m (2026-09-24), average 490.24 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.

  • 1988489.357 m on Nov 6
  • 1989489.383 m on Jan 1
  • 1990489.453 m on Jan 1
  • 2021489.512 m on Nov 25
  • 2022489.535 m on Jan 1

Yearly highs and lows

YearAverageLowLow dateHighHigh date
2026 (30 days)490.235490.144Oct 21490.306Sep 24
2025490.058489.888Jan 28490.341May 16
2024490.040489.840Nov 11490.307Jun 5
2023490.109489.871Dec 13490.644May 13
2022489.954489.535Jan 1490.308May 30
2021489.689489.512Nov 25489.914Jun 17
2020489.874489.641Nov 1490.123Jul 11
2019489.954489.854Jan 1490.091Jul 30
2018489.983489.810Nov 9490.350Jun 8
2017490.002489.795Nov 10490.289May 11
2016490.119489.910Dec 28490.352May 31
2015490.552490.026Dec 31491.406Apr 19
2014490.648489.946Jan 2491.556Jul 13
2013490.137489.886Jan 3490.648May 31
2012490.135489.833Nov 5490.390May 28
2011490.944490.204Mar 31491.970May 12
2010490.408489.922Jan 19490.989Jul 6
2009490.034489.795Jan 1490.302May 13
2008489.912489.748Nov 10490.115Jun 15
2007490.117489.841Dec 31490.629May 23
2006490.113489.879Mar 26490.642May 3
2005490.071489.820Jan 17490.396Apr 27
2004490.013489.809Dec 23490.306Jun 17
2003490.100489.863Dec 22490.454May 9
2002 (309 days)489.931489.733Jan 4490.108Sep 7
2001 (261 days)489.912489.720Dec 16490.127May 20
2000489.942489.782Dec 13490.172Aug 3
1999 (324 days)490.290489.880Dec 31490.772May 24
1998490.024489.878Dec 23490.304Jul 11
1997490.306489.894Dec 31491.028May 13
1996490.273489.867Jan 6490.987May 17
1995490.035489.815Mar 1490.290Jun 28
1994490.144489.826Dec 27490.609Apr 23
1993489.902489.714Jan 24490.213Sep 12
1992489.896489.715Dec 19490.077Jun 11
1991489.869489.652Jan 3490.233Jul 17
1990489.696489.453Jan 1489.929Jul 28
1989489.467489.383Jan 1489.609Jun 26
1988489.666489.357Nov 6489.899May 7
1987489.928489.798Nov 20490.023Jul 31
1986490.016489.805Feb 20490.253Jun 5
1985490.038489.692Jan 1490.495May 18
1984489.922489.640Oct 25490.193Apr 27
1983490.288490.064Mar 19490.642Aug 4
1982490.265489.620Jan 1490.776Jun 23
1981489.645489.585Nov 20489.750Aug 5
1980489.826489.592Nov 27490.069Apr 26
1979490.024489.614Jan 4490.546May 29
1978489.765489.612Nov 16489.969May 31
1977489.891489.667Nov 11490.054May 31
1976490.422489.996Dec 29491.088May 12
1975490.474490.039Dec 23491.063May 20
1974 (312 days)490.746489.698Jan 9491.865Jun 10
1973489.873489.695Nov 30490.109Jun 4
1972490.113489.817Dec 16490.356May 27
1971490.482490.176Dec 28490.850Jul 24
1970 (86 days)490.925490.658Sep 17491.124Jun 12
1969 (136 days)490.605490.350Sep 30490.749Jun 6
1968 (111 days)489.844489.722Oct 15489.914May 30
1967 (100 days)489.823489.646Sep 11490.000Jun 23
1966 (108 days)489.699489.551Sep 23489.896Jun 25
1965 (19 days)489.498489.326May 13489.661Jul 13

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

Monthly averages

MonthAverageLowestHighest
January489.888489.383490.423
February489.884489.383490.359
March489.906489.406490.939
April490.108489.420491.745
May490.325489.326491.970
June490.340489.433491.903
July490.298489.567491.957
August490.203489.356491.666
September490.083489.429491.248
October489.988489.381490.929
November489.917489.357490.663
December489.886489.363490.519

Download

Daily levels as CSV (20,396 rows; credit the original agencies listed below)