Boysen Reservoir water level history

Daily records since 1989 · Level today: 4,711.59 ft

Highest on record

4,895.57 ft

Sep 7, 2001

Lowest on record

4,658.06 ft

Feb 9, 1991

Today

4,711.59 ft

Oct 21, 2026

Years of data

since 1989

In short

Across 31 complete years, 2002 had the lowest average level (4,691.90 ft) and 2015 the highest (4,720.99 ft).

On average the lake is lowest in May (4,712.24 ft) and highest in July (4,719.70 ft).

Boysen Reservoir level, all years

Loading chart…

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

Lowest years

Years ranked by their lowest daily level.

19914,658.06 ft on Feb 9
20024,686.89 ft on Sep 23
20074,701.83 ft on Oct 6
20084,704.37 ft on Jan 5
20174,705.12 ft on May 8

Yearly highs and lows

Year	Average	Low	Low date	High	High date
2026 (292 days)	4,712.08	4,709.54	Sep 19	4,714.34	Jul 2
2025	4,713.13	4,711.15	Oct 21	4,718.60	Jun 26
2024	4,716.94	4,712.40	May 29	4,721.83	Jul 1
2023	4,719.46	4,710.46	May 12	4,728.44	Jun 25
2022	4,719.62	4,715.69	May 28	4,724.26	Jul 6
2021	4,718.33	4,714.02	Mar 4	4,724.16	Jun 30
2020	4,716.19	4,711.52	May 18	4,721.22	Jul 10
2019	4,719.26	4,715.02	Mar 20	4,727.47	Jun 22
2018	4,719.21	4,706.79	May 7	4,727.43	Jun 23
2017	4,720.10	4,705.12	May 8	4,728.85	Jun 27
2016	4,719.25	4,715.89	Feb 17	4,724.64	Jun 24
2015	4,720.99	4,717.23	Dec 31	4,728.32	Jun 19
2014	4,719.86	4,712.64	May 22	4,724.71	Jul 12
2013	4,712.13	4,707.12	Sep 14	4,715.94	Dec 31
2012	4,716.18	4,710.73	Oct 24	4,721.59	Jan 1
2011	4,718.72	4,705.31	Jun 8	4,727.82	Jul 17
2010	4,719.08	4,715.41	Jun 4	4,724.71	Jul 5
2009	4,719.93	4,715.54	May 20	4,726.83	Jul 6
2008	4,713.20	4,704.37	Jan 5	4,721.81	Jul 15
2007	4,706.12	4,701.83	Oct 6	4,710.04	Jun 17
2006	4,711.76	4,706.21	Sep 18	4,716.86	Jan 1
2005	4,720.07	4,716.90	Dec 31	4,724.91	Jun 28
2004 (317 days)	4,709.27	4,702.48	Jan 20	4,717.46	Dec 31
2003 (247 days)	4,697.06	4,691.47	Jan 1	4,699.99	Nov 19
2002	4,691.90	4,686.89	Sep 23	4,696.34	Apr 22
2001 (255 days)	4,708.88	4,693.27	Nov 29	4,895.57	Sep 7
2000	4,715.36	4,711.73	Dec 31	4,719.38	Jun 21
1999	4,718.87	4,710.54	May 24	4,726.63	Jul 9
1998	4,718.58	4,710.57	May 26	4,725.30	Jul 10
1997	4,717.98	4,705.33	May 14	4,727.32	Jun 28
1996 (315 days)	4,717.09	4,705.06	May 15	4,725.45	Jul 10
1995	4,716.19	4,708.91	Jan 10	4,727.98	Jul 16
1994	4,712.71	4,707.22	Oct 2	4,717.47	Jan 1
1993	4,718.19	4,712.19	Jan 24	4,725.27	Jun 24
1992 (249 days)	4,712.25	4,666.35	Apr 15	4,762.46	Jun 16
1991	4,718.22	4,658.06	Feb 9	4,795.08	Jan 3
1990	4,713.78	4,710.02	Jun 5	4,830.63	Sep 28
1989 (1 days)	4,714.94	4,714.94	Dec 31	4,714.94	Dec 31

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

Monthly averages

Month	Average	Lowest	Highest
January	4,715.11	4,691.47	4,795.08
February	4,713.77	4,658.06	4,757.23
March	4,713.70	4,694.43	4,721.04
April	4,712.82	4,666.35	4,739.88
May	4,712.24	4,692.48	4,766.72
June	4,717.45	4,692.51	4,762.46
July	4,719.70	4,690.77	4,728.59
August	4,717.57	4,687.82	4,725.68
September	4,716.02	4,686.89	4,895.57
October	4,715.66	4,687.23	4,893.71
November	4,715.94	4,688.78	4,795.08
December	4,715.18	4,690.15	4,733.10

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Daily levels as CSV (12,871 rows; credit the original agencies listed below)