Country: USA
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Sammamish Lake water level history

Daily records since 1996 · Level today: 25.94 ft

Highest on record
31.14 ft
Jan 4, 1997
Lowest on record
25.47 ft
Sep 7, 2003
Today
25.94 ft
Oct 23, 2026
Years of data
30
since 1996

In short

Across 27 complete years, 2025 had the lowest average level (26.52 ft) and 2010 the highest (27.22 ft).

On average the lake is lowest in September (25.94 ft) and highest in January (27.59 ft).

Sammamish Lake level, all years

Loading chart…

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

Each year's lowest and highest level

25272830311996200020042008201220162020202420261996: lowest 25.65 ft (1996-10-01), highest 29.02 ft (1996-12-31), average 26.89 ft, 92 days measured1997: lowest 25.72 ft (1997-09-11), highest 31.14 ft (1997-01-04), average 26.85 ft, 365 days measured1998: lowest 25.74 ft (1998-09-24), highest 28.53 ft (1998-12-15), average 26.56 ft, 365 days measured1999: lowest 26.00 ft (1999-10-07), highest 28.40 ft (1999-01-01), average 26.93 ft, 365 days measured2000: lowest 25.86 ft (2000-09-04), highest 27.32 ft (2000-02-09), average 26.52 ft, 366 days measured2001: lowest 26.09 ft (2001-08-20), highest 29.38 ft (2001-12-18), average 26.75 ft, 365 days measured2002: lowest 25.77 ft (2002-09-25), highest 28.05 ft (2002-02-25), average 26.66 ft, 365 days measured2003: lowest 25.47 ft (2003-09-07), highest 28.10 ft (2003-02-02), average 26.71 ft, 365 days measured2004: lowest 25.82 ft (2004-08-21), highest 28.80 ft (2004-02-01), average 26.77 ft, 322 days measured2005: lowest 25.86 ft (2005-09-09), highest 28.34 ft (2005-12-31), average 26.66 ft, 333 days measured2006: lowest 25.75 ft (2006-09-12), highest 30.11 ft (2006-01-15), average 27.16 ft, 315 days measured2007: lowest 26.00 ft (2007-08-18), highest 29.23 ft (2007-01-08), average 26.88 ft, 348 days measured2008: lowest 26.12 ft (2008-08-18), highest 28.05 ft (2008-11-15), average 26.91 ft, 357 days measured2009: lowest 25.82 ft (2009-09-01), highest 30.03 ft (2009-01-09), average 26.97 ft, 356 days measured2010: lowest 26.07 ft (2010-08-30), highest 30.01 ft (2010-12-15), average 27.22 ft, 365 days measured2011: lowest 25.98 ft (2011-09-17), highest 29.02 ft (2011-01-23), average 27.08 ft, 365 days measured2012: lowest 25.82 ft (2012-10-08), highest 28.37 ft (2012-03-18), average 26.91 ft, 366 days measured2013: lowest 25.92 ft (2013-08-25), highest 27.75 ft (2013-01-11), average 26.72 ft, 362 days measured2014: lowest 26.02 ft (2014-08-11), highest 28.62 ft (2014-03-11), average 26.77 ft, 365 days measured2015: lowest 25.61 ft (2015-08-27), highest 29.10 ft (2015-12-11), average 26.67 ft, 365 days measured2016: lowest 25.85 ft (2016-09-15), highest 27.74 ft (2016-01-29), average 26.68 ft, 366 days measured2017: lowest 25.72 ft (2017-09-16), highest 28.65 ft (2017-02-17), average 26.75 ft, 365 days measured2018: lowest 25.72 ft (2018-09-09), highest 28.20 ft (2018-01-30), average 26.66 ft, 365 days measured2019: lowest 26.02 ft (2019-09-05), highest 29.08 ft (2019-12-23), average 26.61 ft, 364 days measured2020: lowest 25.85 ft (2020-09-13), highest 31.12 ft (2020-02-09), average 26.78 ft, 364 days measured2021: lowest 25.52 ft (2021-09-16), highest 29.38 ft (2021-01-14), average 26.67 ft, 365 days measured2022: lowest 25.82 ft (2022-09-23), highest 29.29 ft (2022-01-13), average 26.72 ft, 365 days measured2023: lowest 25.62 ft (2023-09-19), highest 29.00 ft (2023-12-10), average 26.53 ft, 365 days measured2024: lowest 25.82 ft (2024-08-16), highest 27.64 ft (2024-01-29), average 26.57 ft, 366 days measured2025: lowest 25.61 ft (2025-09-20), highest 29.00 ft (2025-12-18), average 26.52 ft, 365 days measured2026: lowest 25.68 ft (2026-08-27), highest 28.24 ft (2026-03-21), average 26.41 ft, 294 days measured
2527283031199620042012202020261996: lowest 25.65 ft (1996-10-01), highest 29.02 ft (1996-12-31), average 26.89 ft, 92 days measured1997: lowest 25.72 ft (1997-09-11), highest 31.14 ft (1997-01-04), average 26.85 ft, 365 days measured1998: lowest 25.74 ft (1998-09-24), highest 28.53 ft (1998-12-15), average 26.56 ft, 365 days measured1999: lowest 26.00 ft (1999-10-07), highest 28.40 ft (1999-01-01), average 26.93 ft, 365 days measured2000: lowest 25.86 ft (2000-09-04), highest 27.32 ft (2000-02-09), average 26.52 ft, 366 days measured2001: lowest 26.09 ft (2001-08-20), highest 29.38 ft (2001-12-18), average 26.75 ft, 365 days measured2002: lowest 25.77 ft (2002-09-25), highest 28.05 ft (2002-02-25), average 26.66 ft, 365 days measured2003: lowest 25.47 ft (2003-09-07), highest 28.10 ft (2003-02-02), average 26.71 ft, 365 days measured2004: lowest 25.82 ft (2004-08-21), highest 28.80 ft (2004-02-01), average 26.77 ft, 322 days measured2005: lowest 25.86 ft (2005-09-09), highest 28.34 ft (2005-12-31), average 26.66 ft, 333 days measured2006: lowest 25.75 ft (2006-09-12), highest 30.11 ft (2006-01-15), average 27.16 ft, 315 days measured2007: lowest 26.00 ft (2007-08-18), highest 29.23 ft (2007-01-08), average 26.88 ft, 348 days measured2008: lowest 26.12 ft (2008-08-18), highest 28.05 ft (2008-11-15), average 26.91 ft, 357 days measured2009: lowest 25.82 ft (2009-09-01), highest 30.03 ft (2009-01-09), average 26.97 ft, 356 days measured2010: lowest 26.07 ft (2010-08-30), highest 30.01 ft (2010-12-15), average 27.22 ft, 365 days measured2011: lowest 25.98 ft (2011-09-17), highest 29.02 ft (2011-01-23), average 27.08 ft, 365 days measured2012: lowest 25.82 ft (2012-10-08), highest 28.37 ft (2012-03-18), average 26.91 ft, 366 days measured2013: lowest 25.92 ft (2013-08-25), highest 27.75 ft (2013-01-11), average 26.72 ft, 362 days measured2014: lowest 26.02 ft (2014-08-11), highest 28.62 ft (2014-03-11), average 26.77 ft, 365 days measured2015: lowest 25.61 ft (2015-08-27), highest 29.10 ft (2015-12-11), average 26.67 ft, 365 days measured2016: lowest 25.85 ft (2016-09-15), highest 27.74 ft (2016-01-29), average 26.68 ft, 366 days measured2017: lowest 25.72 ft (2017-09-16), highest 28.65 ft (2017-02-17), average 26.75 ft, 365 days measured2018: lowest 25.72 ft (2018-09-09), highest 28.20 ft (2018-01-30), average 26.66 ft, 365 days measured2019: lowest 26.02 ft (2019-09-05), highest 29.08 ft (2019-12-23), average 26.61 ft, 364 days measured2020: lowest 25.85 ft (2020-09-13), highest 31.12 ft (2020-02-09), average 26.78 ft, 364 days measured2021: lowest 25.52 ft (2021-09-16), highest 29.38 ft (2021-01-14), average 26.67 ft, 365 days measured2022: lowest 25.82 ft (2022-09-23), highest 29.29 ft (2022-01-13), average 26.72 ft, 365 days measured2023: lowest 25.62 ft (2023-09-19), highest 29.00 ft (2023-12-10), average 26.53 ft, 365 days measured2024: lowest 25.82 ft (2024-08-16), highest 27.64 ft (2024-01-29), average 26.57 ft, 366 days measured2025: lowest 25.61 ft (2025-09-20), highest 29.00 ft (2025-12-18), average 26.52 ft, 365 days measured2026: lowest 25.68 ft (2026-08-27), highest 28.24 ft (2026-03-21), average 26.41 ft, 294 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.

  • 200325.47 ft on Sep 7
  • 202125.52 ft on Sep 16
  • 202525.61 ft on Sep 20
  • 201525.61 ft on Aug 27
  • 202325.62 ft on Sep 19

Yearly highs and lows

YearAverageLowLow dateHighHigh date
2026 (294 days)26.4125.68Aug 2728.24Mar 21
202526.5225.61Sep 2029.00Dec 18
202426.5725.82Aug 1627.64Jan 29
202326.5325.62Sep 1929.00Dec 10
202226.7225.82Sep 2329.29Jan 13
202126.6725.52Sep 1629.38Jan 14
202026.7825.85Sep 1331.12Feb 9
201926.6126.02Sep 529.08Dec 23
201826.6625.72Sep 928.20Jan 30
201726.7525.72Sep 1628.65Feb 17
201626.6825.85Sep 1527.74Jan 29
201526.6725.61Aug 2729.10Dec 11
201426.7726.02Aug 1128.62Mar 11
201326.7225.92Aug 2527.75Jan 11
201226.9125.82Oct 828.37Mar 18
201127.0825.98Sep 1729.02Jan 23
201027.2226.07Aug 3030.01Dec 15
200926.9725.82Sep 130.03Jan 9
200826.9126.12Aug 1828.05Nov 15
200726.8826.00Aug 1829.23Jan 8
2006 (315 days)27.1625.75Sep 1230.11Jan 15
200526.6625.86Sep 928.34Dec 31
2004 (322 days)26.7725.82Aug 2128.80Feb 1
200326.7125.47Sep 728.10Feb 2
200226.6625.77Sep 2528.05Feb 25
200126.7526.09Aug 2029.38Dec 18
200026.5225.86Sep 427.32Feb 9
199926.9326.00Oct 728.40Jan 1
199826.5625.74Sep 2428.53Dec 15
199726.8525.72Sep 1131.14Jan 4
1996 (92 days)26.8925.65Oct 129.02Dec 31

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

Monthly averages

MonthAverageLowestHighest
January27.5926.4931.14
February27.3026.4331.12
March27.1926.3228.79
April27.0126.2528.63
May26.6926.0027.76
June26.5326.0528.34
July26.2325.7527.40
August25.9725.5326.39
September25.9425.4726.73
October26.2225.6527.44
November26.9925.8229.39
December27.4526.1730.01

Download

Daily levels as CSV (10,811 rows; credit the original agencies listed below)