Rock Island Lake water level history

Daily records since 1990 · Level today: 611.84 ft

Highest on record

613.01 ft

Jan 23, 1997

Lowest on record

606.86 ft

Mar 4, 2014

Today

611.84 ft

Oct 21, 2026

Years of data

since 1990

In short

Across 36 complete years, 2014 had the lowest average level (611.59 ft) and 2003 the highest (612.93 ft).

On average the lake is lowest in March (612.53 ft) and highest in January (612.66 ft).

Loading chart…

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

Years ranked by their lowest daily level.

Year	Average	Low	Low date	High	High date
2026 (290 days)	612.02	611.27	Jun 19	612.71	Mar 24
2025	611.89	610.69	Dec 26	612.40	Nov 5
2024	611.85	610.85	Apr 15	612.29	Feb 12
2023	611.94	611.03	Jul 6	612.60	May 20
2022	612.15	611.18	Jul 19	612.69	Jan 26
2021	611.87	610.55	Mar 14	612.74	Dec 11
2020	612.10	611.28	May 5	612.73	Aug 27
2019	612.63	611.42	Nov 26	612.86	Jan 21
2018	612.82	612.61	May 16	612.89	Jun 30
2017	612.83	611.82	Oct 8	612.91	Jul 9
2016	612.81	611.61	Jan 18	612.88	Sep 27
2015	612.82	611.98	Oct 30	612.91	Jan 28
2014	611.59	606.86	Mar 4	612.84	Jan 3
2013	612.78	611.05	Oct 18	612.90	Mar 14
2012	612.79	612.20	Sep 29	612.88	Feb 9
2011	612.78	612.23	Jun 5	612.89	Mar 12
2010	612.83	612.05	Dec 4	612.90	Apr 13
2009	612.80	612.33	Jul 9	612.92	Jan 4
2008	612.85	612.26	May 13	612.93	Dec 31
2007	612.85	612.66	Mar 11	612.94	May 11
2006	612.82	612.06	Jun 1	612.91	Jul 2
2005	612.85	612.68	Jul 11	612.93	Jan 23
2004	612.89	612.79	Dec 8	612.96	Jan 29
2003	612.93	612.36	Sep 3	612.97	Jun 3
2002	612.93	612.79	Aug 26	612.98	Jun 2
2001	612.83	612.51	Nov 27	612.99	Jan 8
2000	612.88	612.58	Aug 12	612.96	Jun 30
1999	612.89	612.64	May 14	612.98	Mar 7
1998	612.91	612.06	Apr 1	613.01	Jul 28
1997	612.88	612.47	Jun 25	613.01	Jan 23
1996	612.81	611.08	Dec 7	612.97	Dec 16
1995	612.83	611.67	Jun 30	612.99	Jul 22
1994	612.69	611.67	Jun 29	612.81	Aug 18
1993	612.55	611.95	May 21	612.77	Jun 10
1992	612.45	611.75	Jun 20	612.68	Jan 6
1991	612.61	611.24	Jan 17	612.75	Jan 5
1990	612.64	611.57	Apr 21	612.77	Feb 25

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

Month	Average	Lowest	Highest
January	612.66	611.19	613.01
February	612.66	611.15	613.00
March	612.53	606.86	612.99
April	612.54	608.86	612.99
May	612.61	610.66	612.98
June	612.60	610.92	612.98
July	612.63	611.03	613.01
August	612.63	610.84	613.00
September	612.58	610.02	613.00
October	612.59	609.94	612.96
November	612.61	610.22	612.99
December	612.65	610.69	612.99

Daily levels as CSV (13,427 rows; credit the original agencies listed below)