Country: USA
United StatesCanadaUnited Kingdom

Lake Billy Chinook water level history

Daily records since 2005 · Level today: 1,942.57 ft

Highest on record
1,945.08 ft
Apr 18, 2021
Lowest on record
1,936.56 ft
Nov 25, 2010
Today
1,942.57 ft
Oct 23, 2026
Years of data
21
since 2005

In short

Across 20 complete years, 2007 had the lowest average level (1,941.70 ft) and 2022 the highest (1,943.88 ft).

On average the lake is lowest in January (1,941.18 ft) and highest in May (1,944.55 ft).

Lake Billy Chinook level, all years

Loading chart…

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

Each year's lowest and highest level

1,9361,9381,9411,9431,946200520082011201420172020202320262005: lowest 1,940.29 ft (2005-12-17), highest 1,942.48 ft (2005-12-31), average 1,940.78 ft, 21 days measured2006: lowest 1,939.56 ft (2006-02-19), highest 1,944.70 ft (2006-06-05), average 1,942.92 ft, 358 days measured2007: lowest 1,936.78 ft (2007-12-08), highest 1,944.61 ft (2007-04-18), average 1,941.70 ft, 352 days measured2008: lowest 1,937.62 ft (2008-01-01), highest 1,944.74 ft (2008-06-30), average 1,942.86 ft, 359 days measured2009: lowest 1,941.70 ft (2009-01-01), highest 1,944.68 ft (2009-08-01), average 1,943.63 ft, 352 days measured2010: lowest 1,936.56 ft (2010-11-25), highest 1,944.96 ft (2010-06-05), average 1,942.49 ft, 365 days measured2011: lowest 1,938.97 ft (2011-01-01), highest 1,944.80 ft (2011-05-15), average 1,943.21 ft, 365 days measured2012: lowest 1,940.48 ft (2012-02-09), highest 1,944.89 ft (2012-05-01), average 1,943.29 ft, 366 days measured2013: lowest 1,939.87 ft (2013-02-05), highest 1,944.78 ft (2013-06-26), average 1,943.13 ft, 361 days measured2014: lowest 1,940.25 ft (2014-02-22), highest 1,944.93 ft (2014-06-27), average 1,943.48 ft, 358 days measured2015: lowest 1,938.40 ft (2015-11-27), highest 1,944.76 ft (2015-05-21), average 1,942.74 ft, 364 days measured2016: lowest 1,940.27 ft (2016-01-02), highest 1,944.84 ft (2016-05-21), average 1,943.47 ft, 365 days measured2017: lowest 1,939.20 ft (2017-02-26), highest 1,944.95 ft (2017-05-31), average 1,943.49 ft, 352 days measured2018: lowest 1,941.04 ft (2018-02-21), highest 1,944.87 ft (2018-07-16), average 1,943.60 ft, 365 days measured2019: lowest 1,940.15 ft (2019-03-13), highest 1,944.91 ft (2019-08-11), average 1,943.61 ft, 365 days measured2020: lowest 1,941.88 ft (2020-11-29), highest 1,944.99 ft (2020-05-30), average 1,943.74 ft, 366 days measured2021: lowest 1,940.97 ft (2021-12-31), highest 1,945.08 ft (2021-04-18), average 1,943.47 ft, 365 days measured2022: lowest 1,940.86 ft (2022-01-03), highest 1,945.00 ft (2022-05-26), average 1,943.88 ft, 365 days measured2023: lowest 1,940.08 ft (2023-12-09), highest 1,944.94 ft (2023-07-07), average 1,943.05 ft, 365 days measured2024: lowest 1,939.78 ft (2024-02-16), highest 1,945.00 ft (2024-07-29), average 1,942.62 ft, 366 days measured2025: lowest 1,939.88 ft (2025-11-25), highest 1,944.96 ft (2025-05-30), average 1,942.91 ft, 365 days measured2026: lowest 1,939.98 ft (2026-01-08), highest 1,945.00 ft (2026-05-29), average 1,943.61 ft, 294 days measured
1,9361,9381,9411,9431,946200520112017202320262005: lowest 1,940.29 ft (2005-12-17), highest 1,942.48 ft (2005-12-31), average 1,940.78 ft, 21 days measured2006: lowest 1,939.56 ft (2006-02-19), highest 1,944.70 ft (2006-06-05), average 1,942.92 ft, 358 days measured2007: lowest 1,936.78 ft (2007-12-08), highest 1,944.61 ft (2007-04-18), average 1,941.70 ft, 352 days measured2008: lowest 1,937.62 ft (2008-01-01), highest 1,944.74 ft (2008-06-30), average 1,942.86 ft, 359 days measured2009: lowest 1,941.70 ft (2009-01-01), highest 1,944.68 ft (2009-08-01), average 1,943.63 ft, 352 days measured2010: lowest 1,936.56 ft (2010-11-25), highest 1,944.96 ft (2010-06-05), average 1,942.49 ft, 365 days measured2011: lowest 1,938.97 ft (2011-01-01), highest 1,944.80 ft (2011-05-15), average 1,943.21 ft, 365 days measured2012: lowest 1,940.48 ft (2012-02-09), highest 1,944.89 ft (2012-05-01), average 1,943.29 ft, 366 days measured2013: lowest 1,939.87 ft (2013-02-05), highest 1,944.78 ft (2013-06-26), average 1,943.13 ft, 361 days measured2014: lowest 1,940.25 ft (2014-02-22), highest 1,944.93 ft (2014-06-27), average 1,943.48 ft, 358 days measured2015: lowest 1,938.40 ft (2015-11-27), highest 1,944.76 ft (2015-05-21), average 1,942.74 ft, 364 days measured2016: lowest 1,940.27 ft (2016-01-02), highest 1,944.84 ft (2016-05-21), average 1,943.47 ft, 365 days measured2017: lowest 1,939.20 ft (2017-02-26), highest 1,944.95 ft (2017-05-31), average 1,943.49 ft, 352 days measured2018: lowest 1,941.04 ft (2018-02-21), highest 1,944.87 ft (2018-07-16), average 1,943.60 ft, 365 days measured2019: lowest 1,940.15 ft (2019-03-13), highest 1,944.91 ft (2019-08-11), average 1,943.61 ft, 365 days measured2020: lowest 1,941.88 ft (2020-11-29), highest 1,944.99 ft (2020-05-30), average 1,943.74 ft, 366 days measured2021: lowest 1,940.97 ft (2021-12-31), highest 1,945.08 ft (2021-04-18), average 1,943.47 ft, 365 days measured2022: lowest 1,940.86 ft (2022-01-03), highest 1,945.00 ft (2022-05-26), average 1,943.88 ft, 365 days measured2023: lowest 1,940.08 ft (2023-12-09), highest 1,944.94 ft (2023-07-07), average 1,943.05 ft, 365 days measured2024: lowest 1,939.78 ft (2024-02-16), highest 1,945.00 ft (2024-07-29), average 1,942.62 ft, 366 days measured2025: lowest 1,939.88 ft (2025-11-25), highest 1,944.96 ft (2025-05-30), average 1,942.91 ft, 365 days measured2026: lowest 1,939.98 ft (2026-01-08), highest 1,945.00 ft (2026-05-29), average 1,943.61 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.

  • 20101,936.56 ft on Nov 25
  • 20071,936.78 ft on Dec 8
  • 20081,937.62 ft on Jan 1
  • 20151,938.40 ft on Nov 27
  • 20111,938.97 ft on Jan 1

Yearly highs and lows

YearAverageLowLow dateHighHigh date
2026 (294 days)1,943.611,939.98Jan 81,945.00May 29
20251,942.911,939.88Nov 251,944.96May 30
20241,942.621,939.78Feb 161,945.00Jul 29
20231,943.051,940.08Dec 91,944.94Jul 7
20221,943.881,940.86Jan 31,945.00May 26
20211,943.471,940.97Dec 311,945.08Apr 18
20201,943.741,941.88Nov 291,944.99May 30
20191,943.611,940.15Mar 131,944.91Aug 11
20181,943.601,941.04Feb 211,944.87Jul 16
20171,943.491,939.20Feb 261,944.95May 31
20161,943.471,940.27Jan 21,944.84May 21
20151,942.741,938.40Nov 271,944.76May 21
20141,943.481,940.25Feb 221,944.93Jun 27
20131,943.131,939.87Feb 51,944.78Jun 26
20121,943.291,940.48Feb 91,944.89May 1
20111,943.211,938.97Jan 11,944.80May 15
20101,942.491,936.56Nov 251,944.96Jun 5
20091,943.631,941.70Jan 11,944.68Aug 1
20081,942.861,937.62Jan 11,944.74Jun 30
20071,941.701,936.78Dec 81,944.61Apr 18
20061,942.921,939.56Feb 191,944.70Jun 5
2005 (21 days)1,940.781,940.29Dec 171,942.48Dec 31

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

Monthly averages

MonthAverageLowestHighest
January1,941.181,937.621,943.00
February1,941.291,938.441,943.23
March1,942.311,939.401,944.69
April1,943.751,939.871,945.08
May1,944.551,942.311,945.00
June1,944.541,944.011,945.02
July1,944.551,943.971,945.00
August1,944.531,943.981,944.97
September1,944.351,942.081,944.94
October1,943.291,937.721,944.95
November1,942.071,936.561,944.87
December1,941.491,936.571,944.23

Download

Daily levels as CSV (7,554 rows; credit the original agencies listed below)