Country: Canada
United StatesCanadaUnited Kingdom

Lake Diefenbaker water level history

Daily records since 1964 · Level today: 555.516 m

Highest on record
556.900 m
Jun 18, 2011
Lowest on record
507.949 m
Dec 9, 1964
Today
555.516 m
Oct 23, 2026
Years of data
62
since 1964

In short

Across 58 complete years, 1968 had the lowest average level (550.719 m) and 2011 the highest (555.370 m).

On average the lake is lowest in March (549.657 m) and highest in September (554.680 m).

Lake Diefenbaker level, all years

Loading chart…

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

Each year's lowest and highest level

5055195325465601964197219801988199620042012202020261964: lowest 507.95 m (1964-12-09), highest 508.27 m (1964-12-21), average 508.10 m, 21 days measured1965: lowest 508.21 m (1965-01-05), highest 527.09 m (1965-07-17), average 519.58 m, 212 days measured1966: lowest 525.55 m (1966-03-08), highest 535.03 m (1966-12-30), average 528.77 m, 282 days measured1967: lowest 529.69 m (1967-03-17), highest 550.41 m (1967-08-25), average 543.82 m, 321 days measured1968: lowest 545.66 m (1968-02-28), highest 555.65 m (1968-10-13), average 550.72 m, 366 days measured1969: lowest 548.53 m (1969-04-03), highest 556.55 m (1969-08-13), average 553.68 m, 360 days measured1970: lowest 548.27 m (1970-03-20), highest 556.72 m (1970-07-29), average 552.99 m, 365 days measured1971: lowest 546.57 m (1971-04-06), highest 556.16 m (1971-09-11), average 552.76 m, 365 days measured1972: lowest 548.03 m (1972-03-19), highest 556.82 m (1972-07-20), average 553.36 m, 366 days measured1973: lowest 549.44 m (1973-03-15), highest 556.25 m (1973-08-06), average 553.43 m, 365 days measured1974: lowest 547.24 m (1974-04-12), highest 556.79 m (1974-08-23), average 553.43 m, 365 days measured1975: lowest 549.23 m (1975-04-13), highest 556.53 m (1975-10-04), average 553.77 m, 365 days measured1976: lowest 549.45 m (1976-03-20), highest 556.73 m (1976-09-07), average 553.51 m, 366 days measured1977: lowest 549.61 m (1977-03-07), highest 552.84 m (1977-01-01), average 551.26 m, 365 days measured1978: lowest 547.77 m (1978-03-23), highest 556.83 m (1978-09-16), average 553.11 m, 365 days measured1979: lowest 550.30 m (1979-03-16), highest 555.72 m (1979-08-07), average 553.85 m, 365 days measured1980: lowest 549.17 m (1980-03-25), highest 556.28 m (1980-09-07), average 553.53 m, 366 days measured1981: lowest 551.40 m (1981-03-14), highest 556.83 m (1981-08-16), average 554.08 m, 365 days measured1982: lowest 547.63 m (1982-04-01), highest 556.15 m (1982-08-23), average 552.58 m, 365 days measured1983: lowest 549.88 m (1983-03-30), highest 553.73 m (1983-08-06), average 551.98 m, 365 days measured1984: lowest 549.92 m (1984-02-05), highest 551.83 m (1984-07-13), average 550.88 m, 366 days measured1985: lowest 549.84 m (1985-03-02), highest 554.29 m (1985-11-08), average 552.29 m, 365 days measured1986: lowest 550.62 m (1986-03-03), highest 556.87 m (1986-08-06), average 554.36 m, 365 days measured1987: lowest 550.91 m (1987-04-02), highest 554.67 m (1987-01-01), average 552.88 m, 365 days measured1988: lowest 550.23 m (1988-02-27), highest 552.53 m (1988-11-11), average 551.58 m, 366 days measured1989: lowest 549.65 m (1989-03-08), highest 555.21 m (1989-11-10), average 552.77 m, 365 days measured1990: lowest 551.39 m (1990-03-29), highest 556.81 m (1990-08-30), average 554.45 m, 365 days measured1991: lowest 549.23 m (1991-03-30), highest 556.87 m (1991-08-08), average 553.32 m, 365 days measured1992: lowest 550.74 m (1992-03-08), highest 555.23 m (1992-10-11), average 553.10 m, 366 days measured1993: lowest 551.61 m (1993-03-02), highest 556.87 m (1993-07-23), average 554.77 m, 365 days measured1994: lowest 551.10 m (1994-03-08), highest 555.62 m (1994-09-14), average 553.92 m, 365 days measured1995: lowest 550.51 m (1995-03-17), highest 556.89 m (1995-08-09), average 554.00 m, 365 days measured1996: lowest 551.04 m (1996-03-13), highest 556.22 m (1996-08-15), average 554.07 m, 366 days measured1997: lowest 549.38 m (1997-03-20), highest 556.22 m (1997-09-28), average 553.89 m, 365 days measured1998: lowest 551.75 m (1998-03-17), highest 556.71 m (1998-07-20), average 554.43 m, 365 days measured1999: lowest 550.11 m (1999-03-21), highest 556.73 m (1999-09-15), average 553.61 m, 365 days measured2000: lowest 551.91 m (2000-12-31), highest 555.23 m (2000-01-01), average 553.48 m, 366 days measured2001: lowest 549.90 m (2001-12-31), highest 552.21 m (2001-07-29), average 551.45 m, 365 days measured2002: lowest 549.56 m (2002-02-08), highest 556.35 m (2002-09-19), average 553.15 m, 365 days measured2003: lowest 551.77 m (2003-12-31), highest 555.31 m (2003-07-10), average 553.67 m, 365 days measured2004: lowest 550.48 m (2004-02-22), highest 556.21 m (2004-10-30), average 553.25 m, 366 days measured2005: lowest 552.89 m (2005-03-17), highest 556.86 m (2005-10-13), average 555.16 m, 365 days measured2006: lowest 552.21 m (2006-03-31), highest 556.03 m (2006-07-13), average 554.59 m, 365 days measured2007: lowest 551.87 m (2007-03-17), highest 556.43 m (2007-07-21), average 554.55 m, 365 days measured2008: lowest 550.63 m (2008-03-27), highest 556.66 m (2008-07-14), average 553.99 m, 366 days measured2009: lowest 551.12 m (2009-03-21), highest 555.06 m (2009-09-18), average 553.35 m, 365 days measured2010: lowest 550.86 m (2010-03-09), highest 556.82 m (2010-08-15), average 554.36 m, 365 days measured2011: lowest 553.13 m (2011-04-03), highest 556.90 m (2011-06-18), average 555.37 m, 365 days measured2012: lowest 551.32 m (2012-03-17), highest 556.83 m (2012-07-16), average 554.07 m, 366 days measured2013: lowest 550.93 m (2013-03-20), highest 556.78 m (2013-08-19), average 554.29 m, 365 days measured2014: lowest 552.04 m (2014-03-17), highest 556.49 m (2014-07-18), average 554.65 m, 365 days measured2015: lowest 552.13 m (2015-03-11), highest 555.68 m (2015-10-27), average 554.09 m, 365 days measured2016: lowest 552.05 m (2016-03-05), highest 556.29 m (2016-11-14), average 554.05 m, 366 days measured2017: lowest 551.93 m (2017-03-22), highest 555.78 m (2017-07-24), average 554.42 m, 365 days measured2018: lowest 550.45 m (2018-03-27), highest 555.54 m (2018-08-10), average 553.91 m, 365 days measured2019: lowest 550.97 m (2019-03-17), highest 556.16 m (2019-10-29), average 553.90 m, 365 days measured2020: lowest 550.93 m (2020-03-28), highest 556.58 m (2020-07-22), average 554.43 m, 366 days measured2021: lowest 551.02 m (2021-03-18), highest 554.32 m (2021-01-01), average 552.75 m, 356 days measured2022: lowest 550.43 m (2022-03-19), highest 555.50 m (2022-08-14), average 553.08 m, 365 days measured2023: lowest 551.38 m (2023-03-10), highest 553.47 m (2023-06-15), average 552.57 m, 365 days measured2024: lowest 551.81 m (2024-01-29), highest 555.52 m (2024-11-03), average 553.85 m, 366 days measured2025: lowest 552.08 m (2025-03-01), highest 555.39 m (2025-09-03), average 553.78 m, 365 days measured2026: lowest 555.47 m (2026-10-19), highest 555.55 m (2026-09-26), average 555.52 m, 30 days measured
505519532546560196419801996201220261964: lowest 507.95 m (1964-12-09), highest 508.27 m (1964-12-21), average 508.10 m, 21 days measured1965: lowest 508.21 m (1965-01-05), highest 527.09 m (1965-07-17), average 519.58 m, 212 days measured1966: lowest 525.55 m (1966-03-08), highest 535.03 m (1966-12-30), average 528.77 m, 282 days measured1967: lowest 529.69 m (1967-03-17), highest 550.41 m (1967-08-25), average 543.82 m, 321 days measured1968: lowest 545.66 m (1968-02-28), highest 555.65 m (1968-10-13), average 550.72 m, 366 days measured1969: lowest 548.53 m (1969-04-03), highest 556.55 m (1969-08-13), average 553.68 m, 360 days measured1970: lowest 548.27 m (1970-03-20), highest 556.72 m (1970-07-29), average 552.99 m, 365 days measured1971: lowest 546.57 m (1971-04-06), highest 556.16 m (1971-09-11), average 552.76 m, 365 days measured1972: lowest 548.03 m (1972-03-19), highest 556.82 m (1972-07-20), average 553.36 m, 366 days measured1973: lowest 549.44 m (1973-03-15), highest 556.25 m (1973-08-06), average 553.43 m, 365 days measured1974: lowest 547.24 m (1974-04-12), highest 556.79 m (1974-08-23), average 553.43 m, 365 days measured1975: lowest 549.23 m (1975-04-13), highest 556.53 m (1975-10-04), average 553.77 m, 365 days measured1976: lowest 549.45 m (1976-03-20), highest 556.73 m (1976-09-07), average 553.51 m, 366 days measured1977: lowest 549.61 m (1977-03-07), highest 552.84 m (1977-01-01), average 551.26 m, 365 days measured1978: lowest 547.77 m (1978-03-23), highest 556.83 m (1978-09-16), average 553.11 m, 365 days measured1979: lowest 550.30 m (1979-03-16), highest 555.72 m (1979-08-07), average 553.85 m, 365 days measured1980: lowest 549.17 m (1980-03-25), highest 556.28 m (1980-09-07), average 553.53 m, 366 days measured1981: lowest 551.40 m (1981-03-14), highest 556.83 m (1981-08-16), average 554.08 m, 365 days measured1982: lowest 547.63 m (1982-04-01), highest 556.15 m (1982-08-23), average 552.58 m, 365 days measured1983: lowest 549.88 m (1983-03-30), highest 553.73 m (1983-08-06), average 551.98 m, 365 days measured1984: lowest 549.92 m (1984-02-05), highest 551.83 m (1984-07-13), average 550.88 m, 366 days measured1985: lowest 549.84 m (1985-03-02), highest 554.29 m (1985-11-08), average 552.29 m, 365 days measured1986: lowest 550.62 m (1986-03-03), highest 556.87 m (1986-08-06), average 554.36 m, 365 days measured1987: lowest 550.91 m (1987-04-02), highest 554.67 m (1987-01-01), average 552.88 m, 365 days measured1988: lowest 550.23 m (1988-02-27), highest 552.53 m (1988-11-11), average 551.58 m, 366 days measured1989: lowest 549.65 m (1989-03-08), highest 555.21 m (1989-11-10), average 552.77 m, 365 days measured1990: lowest 551.39 m (1990-03-29), highest 556.81 m (1990-08-30), average 554.45 m, 365 days measured1991: lowest 549.23 m (1991-03-30), highest 556.87 m (1991-08-08), average 553.32 m, 365 days measured1992: lowest 550.74 m (1992-03-08), highest 555.23 m (1992-10-11), average 553.10 m, 366 days measured1993: lowest 551.61 m (1993-03-02), highest 556.87 m (1993-07-23), average 554.77 m, 365 days measured1994: lowest 551.10 m (1994-03-08), highest 555.62 m (1994-09-14), average 553.92 m, 365 days measured1995: lowest 550.51 m (1995-03-17), highest 556.89 m (1995-08-09), average 554.00 m, 365 days measured1996: lowest 551.04 m (1996-03-13), highest 556.22 m (1996-08-15), average 554.07 m, 366 days measured1997: lowest 549.38 m (1997-03-20), highest 556.22 m (1997-09-28), average 553.89 m, 365 days measured1998: lowest 551.75 m (1998-03-17), highest 556.71 m (1998-07-20), average 554.43 m, 365 days measured1999: lowest 550.11 m (1999-03-21), highest 556.73 m (1999-09-15), average 553.61 m, 365 days measured2000: lowest 551.91 m (2000-12-31), highest 555.23 m (2000-01-01), average 553.48 m, 366 days measured2001: lowest 549.90 m (2001-12-31), highest 552.21 m (2001-07-29), average 551.45 m, 365 days measured2002: lowest 549.56 m (2002-02-08), highest 556.35 m (2002-09-19), average 553.15 m, 365 days measured2003: lowest 551.77 m (2003-12-31), highest 555.31 m (2003-07-10), average 553.67 m, 365 days measured2004: lowest 550.48 m (2004-02-22), highest 556.21 m (2004-10-30), average 553.25 m, 366 days measured2005: lowest 552.89 m (2005-03-17), highest 556.86 m (2005-10-13), average 555.16 m, 365 days measured2006: lowest 552.21 m (2006-03-31), highest 556.03 m (2006-07-13), average 554.59 m, 365 days measured2007: lowest 551.87 m (2007-03-17), highest 556.43 m (2007-07-21), average 554.55 m, 365 days measured2008: lowest 550.63 m (2008-03-27), highest 556.66 m (2008-07-14), average 553.99 m, 366 days measured2009: lowest 551.12 m (2009-03-21), highest 555.06 m (2009-09-18), average 553.35 m, 365 days measured2010: lowest 550.86 m (2010-03-09), highest 556.82 m (2010-08-15), average 554.36 m, 365 days measured2011: lowest 553.13 m (2011-04-03), highest 556.90 m (2011-06-18), average 555.37 m, 365 days measured2012: lowest 551.32 m (2012-03-17), highest 556.83 m (2012-07-16), average 554.07 m, 366 days measured2013: lowest 550.93 m (2013-03-20), highest 556.78 m (2013-08-19), average 554.29 m, 365 days measured2014: lowest 552.04 m (2014-03-17), highest 556.49 m (2014-07-18), average 554.65 m, 365 days measured2015: lowest 552.13 m (2015-03-11), highest 555.68 m (2015-10-27), average 554.09 m, 365 days measured2016: lowest 552.05 m (2016-03-05), highest 556.29 m (2016-11-14), average 554.05 m, 366 days measured2017: lowest 551.93 m (2017-03-22), highest 555.78 m (2017-07-24), average 554.42 m, 365 days measured2018: lowest 550.45 m (2018-03-27), highest 555.54 m (2018-08-10), average 553.91 m, 365 days measured2019: lowest 550.97 m (2019-03-17), highest 556.16 m (2019-10-29), average 553.90 m, 365 days measured2020: lowest 550.93 m (2020-03-28), highest 556.58 m (2020-07-22), average 554.43 m, 366 days measured2021: lowest 551.02 m (2021-03-18), highest 554.32 m (2021-01-01), average 552.75 m, 356 days measured2022: lowest 550.43 m (2022-03-19), highest 555.50 m (2022-08-14), average 553.08 m, 365 days measured2023: lowest 551.38 m (2023-03-10), highest 553.47 m (2023-06-15), average 552.57 m, 365 days measured2024: lowest 551.81 m (2024-01-29), highest 555.52 m (2024-11-03), average 553.85 m, 366 days measured2025: lowest 552.08 m (2025-03-01), highest 555.39 m (2025-09-03), average 553.78 m, 365 days measured2026: lowest 555.47 m (2026-10-19), highest 555.55 m (2026-09-26), average 555.52 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.

  • 1968545.656 m on Feb 28
  • 1971546.567 m on Apr 6
  • 1974547.244 m on Apr 12
  • 1982547.633 m on Apr 1
  • 1978547.765 m on Mar 23

Yearly highs and lows

YearAverageLowLow dateHighHigh date
2026 (30 days)555.518555.471Oct 19555.552Sep 26
2025553.784552.077Mar 1555.386Sep 3
2024553.854551.807Jan 29555.524Nov 3
2023552.570551.381Mar 10553.466Jun 15
2022553.082550.432Mar 19555.502Aug 14
2021552.754551.017Mar 18554.317Jan 1
2020554.431550.926Mar 28556.582Jul 22
2019553.896550.968Mar 17556.156Oct 29
2018553.913550.446Mar 27555.540Aug 10
2017554.425551.932Mar 22555.777Jul 24
2016554.054552.054Mar 5556.292Nov 14
2015554.090552.126Mar 11555.679Oct 27
2014554.654552.041Mar 17556.486Jul 18
2013554.294550.925Mar 20556.784Aug 19
2012554.070551.323Mar 17556.831Jul 16
2011555.370553.133Apr 3556.900Jun 18
2010554.364550.862Mar 9556.819Aug 15
2009553.352551.117Mar 21555.055Sep 18
2008553.987550.630Mar 27556.657Jul 14
2007554.545551.868Mar 17556.428Jul 21
2006554.587552.208Mar 31556.028Jul 13
2005555.159552.893Mar 17556.856Oct 13
2004553.246550.478Feb 22556.205Oct 30
2003553.668551.769Dec 31555.311Jul 10
2002553.151549.562Feb 8556.349Sep 19
2001551.446549.903Dec 31552.205Jul 29
2000553.478551.906Dec 31555.227Jan 1
1999553.613550.109Mar 21556.733Sep 15
1998554.426551.753Mar 17556.714Jul 20
1997553.891549.381Mar 20556.218Sep 28
1996554.066551.038Mar 13556.219Aug 15
1995554.005550.510Mar 17556.893Aug 9
1994553.920551.101Mar 8555.617Sep 14
1993554.770551.612Mar 2556.867Jul 23
1992553.102550.742Mar 8555.225Oct 11
1991553.323549.227Mar 30556.866Aug 8
1990554.446551.388Mar 29556.809Aug 30
1989552.775549.654Mar 8555.212Nov 10
1988551.578550.230Feb 27552.531Nov 11
1987552.880550.914Apr 2554.672Jan 1
1986554.362550.618Mar 3556.867Aug 6
1985552.285549.839Mar 2554.286Nov 8
1984550.884549.921Feb 5551.831Jul 13
1983551.980549.877Mar 30553.731Aug 6
1982552.576547.633Apr 1556.154Aug 23
1981554.085551.399Mar 14556.834Aug 16
1980553.533549.171Mar 25556.278Sep 7
1979553.851550.297Mar 16555.719Aug 7
1978553.111547.765Mar 23556.830Sep 16
1977551.262549.606Mar 7552.843Jan 1
1976553.513549.445Mar 20556.729Sep 7
1975553.772549.234Apr 13556.531Oct 4
1974553.425547.244Apr 12556.790Aug 23
1973553.433549.436Mar 15556.251Aug 6
1972553.360548.027Mar 19556.818Jul 20
1971552.762546.567Apr 6556.159Sep 11
1970552.994548.268Mar 20556.720Jul 29
1969553.679548.530Apr 3556.547Aug 13
1968550.719545.656Feb 28555.647Oct 13
1967 (321 days)543.823529.694Mar 17550.408Aug 25
1966 (282 days)528.765525.554Mar 8535.025Dec 30
1965 (212 days)519.579508.208Jan 5527.091Jul 17
1964 (21 days)508.104507.949Dec 9508.269Dec 21

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

Monthly averages

MonthAverageLowestHighest
January551.834508.208555.542
February550.638510.610554.764
March549.657513.216553.969
April550.360514.841555.963
May551.051524.421556.331
June552.745524.622556.900
July554.233525.058556.867
August554.609523.448556.893
September554.680524.454556.855
October554.574524.347556.856
November554.331524.347556.782
December553.116507.949556.273

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Daily levels as CSV (22,037 rows; credit the original agencies listed below)