Upper Klamath Lake water level history

Daily records since 1974 · Level today: 4,138.68 ft

Highest on record

4,143.37 ft

Jun 2, 1993

Lowest on record

37.47 ft

Sep 22, 1981

Today

4,138.68 ft

Oct 21, 2026

Years of data

since 1974

In short

Across 50 complete years, 1979 had the lowest average level (40.61 ft) and 1998 the highest (4,141.78 ft).

On average the lake is lowest in July (3,174.72 ft) and highest in October (3,201.78 ft).

Upper Klamath Lake 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.

198137.47 ft on Sep 22
197937.88 ft on Oct 12
198039.14 ft on Oct 15
197739.21 ft on Sep 20
198639.97 ft on Sep 13

Yearly highs and lows

Year	Average	Low	Low date	High	High date
2026 (292 days)	4,141.09	4,138.69	Oct 17	4,142.70	Apr 11
2025	4,141.23	4,139.28	Oct 19	4,143.23	May 1
2024	4,141.00	4,139.01	Oct 17	4,143.17	May 9
2023	4,140.58	4,138.85	Oct 25	4,142.70	May 12
2022	4,139.90	4,138.47	Oct 22	4,141.03	Apr 13
2021	4,139.71	4,138.53	Oct 11	4,140.91	Mar 18
2020	4,140.19	4,138.13	Oct 24	4,142.16	Apr 5
2019	4,141.02	4,139.05	Nov 25	4,143.29	May 4
2018	4,140.47	4,138.13	Oct 9	4,142.74	May 5
2017	4,140.92	4,138.68	Oct 7	4,143.03	Apr 6
2016	4,140.72	4,138.10	Oct 5	4,143.25	Apr 18
2015	4,140.66	4,138.24	Nov 24	4,142.98	Apr 6
2014	4,140.10	4,138.05	Oct 11	4,142.46	Apr 13
2013	4,140.37	4,138.58	Sep 25	4,142.42	Apr 22
2012	4,140.43	4,137.58	Oct 16	4,143.21	Apr 7
2011	4,141.21	4,139.14	Oct 6	4,143.13	Apr 27
2010	4,139.99	4,138.69	Oct 7	4,141.48	Jun 12
2009	4,140.30	4,137.96	Oct 8	4,142.71	May 17
2008	4,140.62	4,138.64	Oct 9	4,142.94	Jun 8
2007	4,140.65	4,138.09	Sep 28	4,143.15	May 7
2006	4,141.02	4,138.52	Oct 16	4,143.33	May 23
2005	4,141.32	4,138.98	Oct 15	4,143.18	May 4
2004	4,140.74	4,138.77	Oct 8	4,142.74	Apr 19
2003	4,140.93	4,138.52	Oct 29	4,143.28	Apr 12
2002	4,140.82	4,138.39	Sep 29	4,143.08	Apr 22
2001	4,141.15	4,139.39	Oct 23	4,143.10	Apr 16
2000 (251 days)	4,140.79	4,139.21	Sep 8	4,142.70	Apr 16
1999	4,141.49	4,140.19	Oct 15	4,143.00	Jun 10
1998	4,141.78	4,139.81	Oct 15	4,143.12	May 31
1997	4,141.59	4,140.08	Sep 11	4,143.07	May 2
1996	4,141.20	4,138.61	Oct 18	4,143.28	May 21
1995	4,141.32	4,138.62	Jan 1	4,143.24	May 3
1994	4,139.75	4,136.78	Oct 15	4,142.30	Apr 15
1993	4,141.05	4,139.34	Jan 1	4,143.37	Jun 2
1992	4,139.54	4,137.29	Oct 3	4,141.91	Apr 12
1991	4,140.09	4,137.91	Oct 22	4,142.37	May 29
1990	4,140.82	4,138.57	Oct 16	4,142.80	May 4
1989	4,141.17	4,139.44	Sep 17	4,143.08	Apr 25
1988	4,141.04	4,138.54	Oct 15	4,143.13	May 15
1987	4,141.02	4,139.07	Nov 1	4,142.77	May 6
1986	1,075.02	39.97	Sep 13	4,140.85	Dec 31
1985	41.51	40.30	Sep 6	43.16	Jun 6
1984	41.90	40.37	Dec 31	43.09	May 18
1983	42.04	40.69	Jan 8	43.10	Jun 13
1982	42.01	40.76	Dec 30	43.23	Jun 29
1981	40.71	37.47	Sep 22	42.90	Apr 30
1980	41.28	39.14	Oct 15	43.10	May 19
1979	40.61	37.88	Oct 12	43.04	May 10
1978	41.52	40.22	Oct 29	42.99	May 18
1977	41.10	39.21	Sep 20	42.81	Apr 7
1976	41.58	40.64	Dec 9	42.77	May 15
1975	41.93	40.69	Dec 30	43.14	Jul 4
1974 (93 days)	41.13	40.78	Dec 12	41.41	Sep 30

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

Monthly averages

Month	Average	Lowest	Highest
January	3,176.04	40.34	4,142.77
February	3,192.65	40.65	4,142.57
March	3,195.38	41.27	4,143.21
April	3,187.20	42.06	4,143.28
May	3,177.26	42.40	4,143.33
June	3,177.49	41.34	4,143.37
July	3,174.72	39.94	4,143.06
August	3,187.51	38.32	4,142.16
September	3,191.21	37.47	4,140.76
October	3,201.78	37.49	4,140.46
November	3,191.50	38.27	4,141.44
December	3,188.59	39.45	4,141.74

Download

Daily levels as CSV (18,839 rows; credit the original agencies listed below)