Country: Canada
United StatesCanadaUnited Kingdom

Great Slave Lake at Hay River at Hay River water level history

Daily records since 1959 · Level today: 156.657 m

Highest on record
157.755 m
May 8, 2021
Lowest on record
155.971 m
Nov 16, 2023
Today
156.657 m
Oct 23, 2026
Years of data
68
since 1959

In short

Across 38 complete years, 2024 had the lowest average level (156.168 m) and 2021 the highest (157.157 m).

On average the lake is lowest in November (156.469 m) and highest in July (156.770 m).

Great Slave Lake at Hay River at Hay River level, all years

Loading chart…

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

Each year's lowest and highest level

155.9156.4156.9157.4157.91959196719751983199119992007201520261959: lowest 156.17 m (1959-04-19), highest 156.76 m (1959-08-06), average 156.43 m, 365 days measured1960: lowest 156.41 m (1960-04-20), highest 156.96 m (1960-08-18), average 156.64 m, 366 days measured1961: lowest 156.33 m (1961-10-21), highest 156.83 m (1961-09-01), average 156.59 m, 365 days measured1962: lowest 156.21 m (1962-05-02), highest 157.10 m (1962-08-04), average 156.60 m, 365 days measured1963: lowest 156.35 m (1963-11-17), highest 157.03 m (1963-08-22), average 156.66 m, 365 days measured1964: lowest 156.41 m (1964-05-01), highest 157.01 m (1964-08-27), average 156.69 m, 366 days measured1965: lowest 156.46 m (1965-12-26), highest 156.92 m (1965-08-07), average 156.65 m, 365 days measured1966: lowest 156.39 m (1966-04-09), highest 156.85 m (1966-08-11), average 156.58 m, 365 days measured1967: lowest 156.32 m (1967-05-12), highest 156.93 m (1967-07-24), average 156.57 m, 365 days measured1968: lowest 156.15 m (1968-11-25), highest 156.69 m (1968-06-28), average 156.44 m, 366 days measured1969: lowest 156.09 m (1969-11-29), highest 156.63 m (1969-06-08), average 156.31 m, 365 days measured1970: lowest 156.04 m (1970-11-30), highest 156.44 m (1970-07-31), average 156.24 m, 365 days measured1983: lowest 156.34 m (1983-11-02), highest 156.69 m (1983-09-26), average 156.48 m, 130 days measured1984: lowest 156.44 m (1984-05-21), highest 157.02 m (1984-10-17), average 156.60 m, 191 days measured1985: lowest 156.40 m (1985-10-03), highest 157.38 m (1985-05-06), average 156.68 m, 257 days measured1986: lowest 156.28 m (1986-11-29), highest 157.03 m (1986-05-04), average 156.60 m, 240 days measured1987: lowest 156.33 m (1987-11-25), highest 156.93 m (1987-04-30), average 156.53 m, 276 days measured1988: lowest 156.50 m (1988-01-04), highest 157.06 m (1988-08-08), average 156.82 m, 207 days measured1989: lowest 156.53 m (1989-11-12), highest 157.29 m (1989-05-05), average 156.81 m, 291 days measured1990: lowest 156.49 m (1990-11-14), highest 157.05 m (1990-05-06), average 156.72 m, 299 days measured1991: lowest 156.59 m (1991-01-01), highest 157.08 m (1991-04-30), average 156.82 m, 365 days measured1992: lowest 156.51 m (1992-12-02), highest 157.20 m (1992-04-30), average 156.84 m, 222 days measured1993: lowest 156.29 m (1993-11-22), highest 156.95 m (1993-04-21), average 156.68 m, 196 days measured1994: lowest 156.31 m (1994-12-01), highest 157.00 m (1994-05-20), average 156.73 m, 259 days measured1995: lowest 156.08 m (1995-10-17), highest 156.64 m (1995-04-07), average 156.45 m, 342 days measured1996: lowest 156.35 m (1996-01-07), highest 157.26 m (1996-09-02), average 156.76 m, 278 days measured1997: lowest 156.79 m (1997-01-08), highest 157.30 m (1997-08-15), average 157.00 m, 365 days measured1998: lowest 156.34 m (1998-12-25), highest 157.24 m (1998-04-30), average 156.82 m, 365 days measured1999: lowest 156.30 m (1999-12-01), highest 156.79 m (1999-08-08), average 156.56 m, 365 days measured2000: lowest 156.37 m (2000-01-02), highest 156.95 m (2000-08-27), average 156.55 m, 334 days measured2001: lowest 156.43 m (2001-11-16), highest 157.06 m (2001-09-09), average 156.66 m, 330 days measured2002: lowest 156.51 m (2002-12-03), highest 156.95 m (2002-07-30), average 156.65 m, 355 days measured2003: lowest 156.41 m (2003-11-28), highest 157.36 m (2003-05-05), average 156.77 m, 365 days measured2004: lowest 156.38 m (2004-11-04), highest 156.79 m (2004-05-01), average 156.58 m, 366 days measured2005: lowest 156.48 m (2005-01-01), highest 157.00 m (2005-08-28), average 156.75 m, 365 days measured2006: lowest 156.31 m (2006-11-17), highest 156.91 m (2006-06-09), average 156.71 m, 362 days measured2007: lowest 156.43 m (2007-01-06), highest 156.94 m (2007-09-04), average 156.70 m, 322 days measured2008: lowest 156.42 m (2008-11-22), highest 156.88 m (2008-07-04), average 156.68 m, 299 days measured2009: lowest 156.40 m (2009-11-15), highest 156.93 m (2009-08-12), average 156.71 m, 365 days measured2010: lowest 156.11 m (2010-11-18), highest 156.75 m (2010-04-29), average 156.51 m, 362 days measured2011: lowest 156.24 m (2011-01-09), highest 156.91 m (2011-08-30), average 156.48 m, 361 days measured2012: lowest 156.39 m (2012-01-03), highest 156.94 m (2012-10-22), average 156.64 m, 363 days measured2013: lowest 156.42 m (2013-11-10), highest 157.07 m (2013-09-17), average 156.71 m, 365 days measured2014: lowest 156.22 m (2014-11-30), highest 156.76 m (2014-07-09), average 156.56 m, 359 days measured2015: lowest 156.08 m (2015-11-11), highest 156.58 m (2015-08-20), average 156.39 m, 361 days measured2016: lowest 156.23 m (2016-01-04), highest 156.84 m (2016-09-02), average 156.55 m, 366 days measured2017: lowest 156.40 m (2017-12-05), highest 156.90 m (2017-06-21), average 156.71 m, 283 days measured2018: lowest 156.35 m (2018-11-16), highest 156.85 m (2018-08-22), average 156.60 m, 365 days measured2019: lowest 156.37 m (2019-11-28), highest 156.71 m (2019-10-07), average 156.52 m, 365 days measured2020: lowest 156.55 m (2020-01-02), highest 157.55 m (2020-08-29), average 157.04 m, 363 days measured2021: lowest 156.73 m (2021-11-29), highest 157.76 m (2021-05-08), average 157.16 m, 364 days measured2022: lowest 156.42 m (2022-11-17), highest 157.39 m (2022-05-25), average 156.86 m, 257 days measured2023: lowest 155.97 m (2023-11-16), highest 156.76 m (2023-05-02), average 156.43 m, 365 days measured2024: lowest 155.99 m (2024-11-25), highest 156.39 m (2024-07-11), average 156.17 m, 353 days measured2026: lowest 156.62 m (2026-10-11), highest 156.94 m (2026-09-26), average 156.78 m, 30 days measured
155.9156.4156.9157.4157.9195919761993201020261959: lowest 156.17 m (1959-04-19), highest 156.76 m (1959-08-06), average 156.43 m, 365 days measured1960: lowest 156.41 m (1960-04-20), highest 156.96 m (1960-08-18), average 156.64 m, 366 days measured1961: lowest 156.33 m (1961-10-21), highest 156.83 m (1961-09-01), average 156.59 m, 365 days measured1962: lowest 156.21 m (1962-05-02), highest 157.10 m (1962-08-04), average 156.60 m, 365 days measured1963: lowest 156.35 m (1963-11-17), highest 157.03 m (1963-08-22), average 156.66 m, 365 days measured1964: lowest 156.41 m (1964-05-01), highest 157.01 m (1964-08-27), average 156.69 m, 366 days measured1965: lowest 156.46 m (1965-12-26), highest 156.92 m (1965-08-07), average 156.65 m, 365 days measured1966: lowest 156.39 m (1966-04-09), highest 156.85 m (1966-08-11), average 156.58 m, 365 days measured1967: lowest 156.32 m (1967-05-12), highest 156.93 m (1967-07-24), average 156.57 m, 365 days measured1968: lowest 156.15 m (1968-11-25), highest 156.69 m (1968-06-28), average 156.44 m, 366 days measured1969: lowest 156.09 m (1969-11-29), highest 156.63 m (1969-06-08), average 156.31 m, 365 days measured1970: lowest 156.04 m (1970-11-30), highest 156.44 m (1970-07-31), average 156.24 m, 365 days measured1983: lowest 156.34 m (1983-11-02), highest 156.69 m (1983-09-26), average 156.48 m, 130 days measured1984: lowest 156.44 m (1984-05-21), highest 157.02 m (1984-10-17), average 156.60 m, 191 days measured1985: lowest 156.40 m (1985-10-03), highest 157.38 m (1985-05-06), average 156.68 m, 257 days measured1986: lowest 156.28 m (1986-11-29), highest 157.03 m (1986-05-04), average 156.60 m, 240 days measured1987: lowest 156.33 m (1987-11-25), highest 156.93 m (1987-04-30), average 156.53 m, 276 days measured1988: lowest 156.50 m (1988-01-04), highest 157.06 m (1988-08-08), average 156.82 m, 207 days measured1989: lowest 156.53 m (1989-11-12), highest 157.29 m (1989-05-05), average 156.81 m, 291 days measured1990: lowest 156.49 m (1990-11-14), highest 157.05 m (1990-05-06), average 156.72 m, 299 days measured1991: lowest 156.59 m (1991-01-01), highest 157.08 m (1991-04-30), average 156.82 m, 365 days measured1992: lowest 156.51 m (1992-12-02), highest 157.20 m (1992-04-30), average 156.84 m, 222 days measured1993: lowest 156.29 m (1993-11-22), highest 156.95 m (1993-04-21), average 156.68 m, 196 days measured1994: lowest 156.31 m (1994-12-01), highest 157.00 m (1994-05-20), average 156.73 m, 259 days measured1995: lowest 156.08 m (1995-10-17), highest 156.64 m (1995-04-07), average 156.45 m, 342 days measured1996: lowest 156.35 m (1996-01-07), highest 157.26 m (1996-09-02), average 156.76 m, 278 days measured1997: lowest 156.79 m (1997-01-08), highest 157.30 m (1997-08-15), average 157.00 m, 365 days measured1998: lowest 156.34 m (1998-12-25), highest 157.24 m (1998-04-30), average 156.82 m, 365 days measured1999: lowest 156.30 m (1999-12-01), highest 156.79 m (1999-08-08), average 156.56 m, 365 days measured2000: lowest 156.37 m (2000-01-02), highest 156.95 m (2000-08-27), average 156.55 m, 334 days measured2001: lowest 156.43 m (2001-11-16), highest 157.06 m (2001-09-09), average 156.66 m, 330 days measured2002: lowest 156.51 m (2002-12-03), highest 156.95 m (2002-07-30), average 156.65 m, 355 days measured2003: lowest 156.41 m (2003-11-28), highest 157.36 m (2003-05-05), average 156.77 m, 365 days measured2004: lowest 156.38 m (2004-11-04), highest 156.79 m (2004-05-01), average 156.58 m, 366 days measured2005: lowest 156.48 m (2005-01-01), highest 157.00 m (2005-08-28), average 156.75 m, 365 days measured2006: lowest 156.31 m (2006-11-17), highest 156.91 m (2006-06-09), average 156.71 m, 362 days measured2007: lowest 156.43 m (2007-01-06), highest 156.94 m (2007-09-04), average 156.70 m, 322 days measured2008: lowest 156.42 m (2008-11-22), highest 156.88 m (2008-07-04), average 156.68 m, 299 days measured2009: lowest 156.40 m (2009-11-15), highest 156.93 m (2009-08-12), average 156.71 m, 365 days measured2010: lowest 156.11 m (2010-11-18), highest 156.75 m (2010-04-29), average 156.51 m, 362 days measured2011: lowest 156.24 m (2011-01-09), highest 156.91 m (2011-08-30), average 156.48 m, 361 days measured2012: lowest 156.39 m (2012-01-03), highest 156.94 m (2012-10-22), average 156.64 m, 363 days measured2013: lowest 156.42 m (2013-11-10), highest 157.07 m (2013-09-17), average 156.71 m, 365 days measured2014: lowest 156.22 m (2014-11-30), highest 156.76 m (2014-07-09), average 156.56 m, 359 days measured2015: lowest 156.08 m (2015-11-11), highest 156.58 m (2015-08-20), average 156.39 m, 361 days measured2016: lowest 156.23 m (2016-01-04), highest 156.84 m (2016-09-02), average 156.55 m, 366 days measured2017: lowest 156.40 m (2017-12-05), highest 156.90 m (2017-06-21), average 156.71 m, 283 days measured2018: lowest 156.35 m (2018-11-16), highest 156.85 m (2018-08-22), average 156.60 m, 365 days measured2019: lowest 156.37 m (2019-11-28), highest 156.71 m (2019-10-07), average 156.52 m, 365 days measured2020: lowest 156.55 m (2020-01-02), highest 157.55 m (2020-08-29), average 157.04 m, 363 days measured2021: lowest 156.73 m (2021-11-29), highest 157.76 m (2021-05-08), average 157.16 m, 364 days measured2022: lowest 156.42 m (2022-11-17), highest 157.39 m (2022-05-25), average 156.86 m, 257 days measured2023: lowest 155.97 m (2023-11-16), highest 156.76 m (2023-05-02), average 156.43 m, 365 days measured2024: lowest 155.99 m (2024-11-25), highest 156.39 m (2024-07-11), average 156.17 m, 353 days measured2026: lowest 156.62 m (2026-10-11), highest 156.94 m (2026-09-26), average 156.78 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.

  • 2023155.971 m on Nov 16
  • 2024155.993 m on Nov 25
  • 1970156.042 m on Nov 30
  • 1995156.082 m on Oct 17
  • 2015156.084 m on Nov 11

Yearly highs and lows

YearAverageLowLow dateHighHigh date
2026 (30 days)156.777156.616Oct 11156.939Sep 26
2024156.168155.993Nov 25156.391Jul 11
2023156.431155.971Nov 16156.762May 2
2022 (257 days)156.859156.421Nov 17157.393May 25
2021157.157156.731Nov 29157.755May 8
2020157.038156.551Jan 2157.552Aug 29
2019156.522156.368Nov 28156.715Oct 7
2018156.604156.351Nov 16156.850Aug 22
2017 (283 days)156.711156.395Dec 5156.899Jun 21
2016156.547156.228Jan 4156.841Sep 2
2015156.389156.084Nov 11156.581Aug 20
2014156.564156.220Nov 30156.759Jul 9
2013156.709156.419Nov 10157.066Sep 17
2012156.644156.392Jan 3156.937Oct 22
2011156.481156.238Jan 9156.913Aug 30
2010156.513156.109Nov 18156.747Apr 29
2009156.713156.397Nov 15156.935Aug 12
2008 (299 days)156.685156.422Nov 22156.880Jul 4
2007 (322 days)156.696156.429Jan 6156.940Sep 4
2006156.712156.313Nov 17156.913Jun 9
2005156.747156.485Jan 1156.995Aug 28
2004156.578156.375Nov 4156.786May 1
2003156.767156.406Nov 28157.357May 5
2002156.649156.510Dec 3156.949Jul 30
2001156.658156.427Nov 16157.058Sep 9
2000156.550156.371Jan 2156.952Aug 27
1999156.556156.300Dec 1156.790Aug 8
1998156.822156.345Dec 25157.241Apr 30
1997156.999156.785Jan 8157.297Aug 15
1996 (278 days)156.761156.353Jan 7157.260Sep 2
1995156.451156.082Oct 17156.641Apr 7
1994 (259 days)156.727156.311Dec 1156.997May 20
1993 (196 days)156.677156.294Nov 22156.947Apr 21
1992 (222 days)156.838156.510Dec 2157.203Apr 30
1991156.816156.587Jan 1157.080Apr 30
1990 (299 days)156.720156.487Nov 14157.048May 6
1989 (291 days)156.814156.526Nov 12157.292May 5
1988 (207 days)156.820156.502Jan 4157.060Aug 8
1987 (276 days)156.535156.335Nov 25156.929Apr 30
1986 (240 days)156.600156.278Nov 29157.030May 4
1985 (257 days)156.677156.399Oct 3157.381May 6
1984 (191 days)156.597156.440May 21157.019Oct 17
1983 (130 days)156.482156.337Nov 2156.690Sep 26
1970156.241156.042Nov 30156.441Jul 31
1969156.310156.094Nov 29156.627Jun 8
1968156.444156.152Nov 25156.685Jun 28
1967156.569156.320May 12156.929Jul 24
1966156.576156.393Apr 9156.847Aug 11
1965156.650156.463Dec 26156.920Aug 7
1964156.693156.414May 1157.008Aug 27
1963156.656156.350Nov 17157.030Aug 22
1962156.602156.207May 2157.100Aug 4
1961156.591156.335Oct 21156.835Sep 1
1960156.636156.408Apr 20156.957Aug 18
1959156.429156.170Apr 19156.758Aug 6

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

Monthly averages

MonthAverageLowestHighest
January156.537156.022157.250
February156.578156.067157.284
March156.622156.116157.321
April156.664156.165157.332
May156.691156.143157.755
June156.740156.178157.451
July156.770156.196157.318
August156.758156.218157.552
September156.681156.180157.439
October156.567156.066157.356
November156.469155.971157.208
December156.484155.972157.160

Download

Daily levels as CSV (17,776 rows; credit the original agencies listed below)