Diablo Reservoir water level history

Daily records since 1982 · Level today: 1,202.23 ft

Highest on record

1,205.83 ft

Jul 21, 1991

Lowest on record

1,182.68 ft

Oct 4, 1987

Today

1,202.23 ft

Oct 21, 2026

Years of data

since 1982

In short

Across 41 complete years, 2025 had the lowest average level (1,200.28 ft) and 2004 the highest (1,202.70 ft).

On average the lake is lowest in October (1,201.06 ft) and highest in July (1,202.34 ft).

Diablo Reservoir level, all years

Loading chart…

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

Lowest years

Years ranked by their lowest daily level.

19921,183.21 ft on Oct 6
19881,186.12 ft on May 5
20171,193.49 ft on Sep 10
20151,194.27 ft on Oct 21
20161,194.30 ft on Apr 25

Yearly highs and lows

Year	Average	Low	Low date	High	High date
2026 (293 days)	1,201.80	1,198.26	May 17	1,204.66	May 5
2025	1,200.28	1,196.12	Feb 23	1,204.72	Nov 1
2024	1,201.99	1,197.40	May 9	1,204.38	Aug 26
2023	1,201.77	1,197.60	Dec 4	1,204.11	Aug 14
2022	1,201.45	1,196.29	Feb 7	1,204.42	Jun 6
2021	1,201.08	1,197.51	Apr 26	1,204.27	Mar 25
2020	1,200.97	1,196.62	Sep 20	1,204.62	May 30
2019	1,201.20	1,198.08	Oct 17	1,204.57	Jul 10
2018	1,201.08	1,198.06	Jan 28	1,203.55	May 9
2017	1,200.80	1,193.49	Sep 10	1,204.27	Jun 29
2016	1,201.48	1,194.30	Apr 25	1,204.66	Jun 4
2015	1,200.50	1,194.27	Oct 21	1,204.10	Nov 30
2014	1,201.38	1,198.33	Oct 8	1,204.10	Jun 24
2013	1,201.21	1,199.66	Oct 17	1,204.15	Oct 16
2012	1,201.25	1,199.57	Apr 16	1,204.77	Oct 19
2011	1,201.47	1,198.09	Aug 7	1,204.39	Jul 15
2010	1,201.55	1,198.20	Nov 14	1,204.56	Jul 11
2009	1,201.77	1,198.31	Apr 3	1,204.80	Nov 20
2008	1,201.93	1,196.99	Jul 28	1,204.70	Jul 1
2007	1,201.98	1,199.05	Aug 4	1,204.85	Jul 5
2006	1,202.33	1,199.60	Apr 19	1,205.11	May 16
2005	1,201.66	1,196.38	May 9	1,204.60	Sep 29
2004	1,202.70	1,199.60	May 31	1,205.29	Aug 11
2003	1,201.95	1,199.28	Mar 3	1,204.66	May 24
2002	1,201.60	1,197.35	Aug 19	1,204.81	Jul 11
2001	1,202.40	1,199.38	Dec 14	1,204.74	Jun 9
2000	1,202.55	1,200.11	Aug 31	1,205.49	Jun 14
1999	1,202.44	1,198.65	Apr 11	1,205.27	Aug 20
1998	1,202.12	1,198.04	Dec 20	1,204.91	Jun 1
1997	1,202.55	1,199.08	Oct 27	1,205.58	Jun 29
1996	1,201.87	1,195.47	Oct 16	1,204.87	May 14
1995	1,201.89	1,196.75	Apr 1	1,204.89	Jul 19
1994	1,202.25	1,198.34	Aug 24	1,204.44	Feb 22
1993	1,202.50	1,197.69	Jan 4	1,204.40	Jun 14
1992	1,201.34	1,183.21	Oct 6	1,205.30	Mar 3
1991	1,202.53	1,197.65	Jan 1	1,205.83	Jul 21
1990	1,202.53	1,197.11	Dec 31	1,205.59	Jul 14
1989	1,202.02	1,197.61	Oct 3	1,205.60	Jul 19
1988	1,201.10	1,186.12	May 5	1,204.78	Nov 18
1987 (93 days)	1,200.37	1,182.68	Oct 4	1,203.80	Oct 29
1986 (273 days)	1,201.43	1,197.39	Feb 23	1,205.13	Mar 31
1985	1,201.24	1,196.88	Jun 19	1,205.53	Jul 31
1984	1,201.00	1,197.74	Jan 26	1,205.58	Jan 4
1983	1,201.12	1,197.76	Jan 5	1,205.45	Jul 13
1982 (92 days)	1,200.22	1,198.49	Nov 25	1,203.45	Nov 22

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

Monthly averages

Month	Average	Lowest	Highest
January	1,201.45	1,196.20	1,205.58
February	1,201.44	1,196.12	1,204.77
March	1,201.66	1,196.21	1,205.30
April	1,201.59	1,186.59	1,205.31
May	1,201.79	1,186.12	1,205.41
June	1,202.00	1,196.71	1,205.58
July	1,202.34	1,196.99	1,205.83
August	1,202.15	1,194.79	1,205.29
September	1,201.72	1,184.11	1,205.33
October	1,201.06	1,182.68	1,205.36
November	1,201.32	1,195.38	1,205.35
December	1,201.40	1,197.11	1,204.65

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Daily levels as CSV (15,721 rows; credit the original agencies listed below)