Ottawa River at Grenville

Monthly and Annual Mean Water Levels in Metres														Annual Extremes
Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Means	Daily Maximum	Daily Minimum
1933	39.93	39.68	39.57	41.53	41.60	40.37	39.64	39.47	39.17	39.02	39.13	39.15	39.85	42.30	38.88
1934	39.09	39.08	39.16	41.11	41.86	40.58	39.91	39.29	39.26	39.47	39.42	39.67	39.83	42.44	38.87
1935	39.51	39.40	39.78	40.48	40.41	39.91	39.97	39.55	39.36	39.33	39.55	39.44	39.73	40.95	39.20
1936	39.40	39.37	40.20	40.96	42.23	41.02	39.71	39.31	39.30	39.73	40.06	39.58	40.07	42.94	39.10
1937	40.07	39.93	40.05	40.78	41.35	40.14	39.51	39.40	39.29	39.55	40.37	40.00	40.04	41.84	39.10
1938	39.61	39.64	40.27	41.73	41.42	40.26	39.51	39.38	39.43	39.56	39.47	39.43	39.97	42.37	39.19
1939	39.40	39.41	39.44	40.33	41.62	40.73	40.10	39.91	39.45	39.52	39.68	39.47	39.92	41.98	39.21
1940	39.32	39.26	39.29	40.33	40.89	41.10	40.22	39.51	39.53	39.37	39.54	39.59	39.83	41.65	39.11
1941	39.59	39.54	39.55	40.91	40.50	39.67	39.58	39.48	39.53	39.99	40.52	40.15	39.92	42.14	39.24
1942	39.86	39.82	40.08	41.03	40.91	40.45	39.58	39.40	39.30	39.29	39.50	39.37	39.88	41.66	39.03
1943	39.45	39.52	39.77	40.64	42.10	41.17	40.04	39.55	39.64	39.51	39.68	39.55	40.05	42.99	39.25
1944	39.49	39.37	39.51	39.85	40.47	39.64	39.37	39.26	39.26	39.35	39.38	39.39	39.53	41.04	39.01
1945	39.36	39.28	40.03	40.83	40.73	40.68	39.58	39.26	39.34	39.59	39.69	39.51	39.82	41.89	39.12
1946	39.65	39.64	40.24	40.45	40.19	40.22	39.47	39.32	39.28	39.44	39.66	39.85	39.79	40.93	39.12
1947	39.77	39.81	39.80	41.43	42.69	42.48	40.59	39.71	39.49	39.50	39.46	39.45	40.35	43.15	39.22
1948	39.40	39.35	39.81	40.72	40.46	39.94	39.49	39.36	39.26	39.19	39.20	39.34	39.63	41.07	38.99
1949	39.44	39.51	39.72	41.27	40.78	40.00	39.92	39.33	39.33	39.35	39.35	39.53	39.79	41.69	39.07
1950	39.73	39.61	39.56	40.66	40.65	40.17	39.68	39.43	39.43	39.39	39.69	39.84	39.82	41.21	39.17
1951	39.80	39.77	40.19	42.34	40.95	39.85	39.95	39.51	39.54	39.97	40.72	40.40	40.25	43.20	39.28
1952	40.15	40.06	40.04	41.20	41.09	40.47	39.83	39.86	39.58	39.62	39.54	39.89	40.11	41.82	39.33
1953	39.88	39.96	40.44	41.33	40.31	39.64	39.43	39.28	39.18	39.27	39.25	39.31	39.77	41.88	39.01
1954	39.36	39.42	39.93	41.05	40.47	40.42	39.89	39.55	39.63	40.47	40.46	40.24	40.08	41.75	39.19
1955	40.10	39.91	40.00	41.53	40.28	39.63	39.35	39.13	39.14	39.34	40.07	39.82	39.86	42.22	38.91
1956	39.65	39.57	39.53	40.57	40.74	40.33	39.88	39.77	40.08	40.16	39.82	39.81	39.99	41.25	39.34
1957	39.79	39.79	39.94	40.06	40.04	39.75	40.64	39.58	39.69	39.91	40.29	40.34	39.99	41.33	39.15
1958	40.17	40.06	40.18	40.69	39.87	39.74	39.73	39.47	39.63	39.87	40.04	39.88	39.94	41.01	39.26
1959	39.77	39.71	39.61	40.71	40.46	39.73	39.37	39.28	39.48	39.62	40.16	40.20	39.84	41.24	39.08
1960	39.99	39.98	39.92	41.44	41.93	40.17	40.36	40.01	39.64	39.62	39.53	39.46	40.17	42.50	39.26
1961	39.44	39.32	39.39	39.90	40.02	39.65	39.60	39.49	39.49	39.52	39.40	39.58	39.57	40.23	39.11
1962	39.62	39.67	---	---	40.37	39.66	39.13	39.12	39.23	39.39	39.74	40.03	39.62	40.82	38.94
1963	40.09	40.03	40.06	40.48	40.18	40.28	40.53	40.73	41.09	41.08	41.08	41.16	40.57	41.24	39.83
1964	41.19	41.18	41.21	41.28	41.27	41.20	41.07	41.09	41.12	41.14	41.14	41.13	41.17	41.55	40.86
1965	41.18	41.22	41.16	41.26	41.39	41.21	41.17	41.18	41.21	41.42	41.32	41.32	41.25	41.53	40.94
1966	41.27	41.25	41.39	41.33	41.24	41.25	41.13	41.17	41.13	41.16	41.22	41.60	41.26	41.99	41.01
1967	41.48	41.28	41.09	41.13	41.18	41.18	41.28	41.20	41.21	41.25	41.21	41.31	41.23	41.77	40.88
1968	41.26	41.22	41.15	41.05	41.22	41.20	41.22	41.17	41.16	41.16	41.16	41.18	41.18	41.41	40.77
1969	41.27	41.24	41.19	41.17	40.90	41.28	41.21	41.21	41.18	41.19	41.25	41.29	41.20	41.43	40.66
1970	41.24	41.24	41.21	41.06	40.96	41.11	41.18	41.20	41.17	41.19	41.20	41.21	41.16	41.36	40.61
1971	41.17	41.18	41.20	41.17	41.18	41.19	41.16	41.15	41.13	41.13	41.13	41.18	41.16	41.42	40.84
1972	41.19	41.15	41.18	41.13	41.43	41.36	41.34	41.28	41.25	41.25	41.34	41.35	41.27	41.67	40.95
1973	41.31	41.32	41.36	41.58	41.58	41.39	41.32	41.21	41.16	41.20	41.15	41.29	41.32	41.84	40.68
1974	41.22	41.21	41.35	41.53	42.12	41.64	41.17	41.15	41.20	41.34	41.38	41.41	41.39	42.67	40.66
1975	41.43	41.42	41.34	41.39	41.36	41.28	41.17	41.23	41.22	41.28	41.29	41.36	41.32	41.84	40.85
1976	41.19	41.41	41.21	41.67	41.41	41.30	41.28	41.29	41.34	41.32	41.25	41.41	41.34	42.70	40.67
1977	41.37	41.31	41.29	41.24	41.27	41.20	41.22	41.21	41.11	41.14	---	41.36	41.24	41.71	40.60
1978	41.34	41.31	41.18	41.26	41.24	41.24	41.18	41.15	41.14	41.18	41.11	41.14	41.21	41.53	40.84
1979	41.15	41.12	41.24	41.23	41.49	---	41.20	41.20	41.17	41.23	41.30	41.35	41.24	42.07	40.92
1980	41.32	41.24	41.37	41.33	41.20	41.19	41.19	41.18	41.15	41.21	41.00	41.32	41.23	41.78	40.59
1981	41.27	41.42	41.16	41.32	41.33	41.41	41.24	41.19	41.20	41.24	41.26	41.22	41.27	41.89	40.67
1982	41.18	41.20	41.23	41.28	41.20	41.20	41.17	41.16	41.16	41.17	41.20	41.38	41.21	41.64	41.00
1983	41.44	41.35	41.34	41.32	41.47	41.26	41.18	41.17	41.15	41.15	41.14	41.24	41.27	42.03	40.64
1984	41.21	41.28	41.25	41.38	41.27	41.35	41.26	41.20	41.18	41.17	41.22	41.31	41.26	41.59	40.95
1985	41.39	41.38	41.36	41.35	41.32	41.21	41.20	41.22	41.17	41.17	41.15	41.20	41.26	41.67	40.95
1986	41.18	41.15	41.18	41.31	41.37	41.28	41.20	41.17	41.22	41.24	41.22	41.23	41.23	41.66	40.90
1987	41.22	41.20	41.23	41.26	41.17	41.18	41.17	41.16	41.15	41.17	41.17	41.21	41.19	41.65	41.00
1988	41.24	41.27	41.19	41.26	41.28	41.19	41.17	41.20	41.20	41.33	41.42	41.35	41.26	41.57	40.97
1989	41.32	41.32	41.27	41.32	41.42	41.35	41.17	41.14	41.17	41.15	41.24	41.25	41.26	41.68	40.99
1990	41.31	41.31	41.34	41.38	41.31	41.22	41.21	41.17	41.16	41.25	41.28	41.42	41.28	41.59	41.05
1991	41.37	41.39	41.37	41.42	41.20	41.18	41.15	41.14	41.14	41.16	41.19	41.27	41.25	41.85	41.03
1992	41.28	41.28	41.27	41.37	41.27	41.18	41.18	41.17	41.21	41.25	41.38	41.34	41.26	41.51	41.04
1993	41.35	41.29	41.23	41.38	41.23	41.25	41.17	41.16	41.16	41.27	41.32	41.30	41.26	41.57	41.03
1994	41.27	41.33	41.30	41.18	41.36	41.30	41.30	41.24	41.17	41.16	41.22	41.23	41.25	41.56	40.81
1995	41.39	41.58	41.46	41.21	41.32	41.31	41.16	41.16	41.14	41.15	41.24	41.28	41.28	41.85	41.11
1996	41.34	41.38	41.32	41.30	41.27	41.28	41.23	41.20	41.17	41.18	41.21	41.24	41.26	41.59	41.00
1997	41.29	41.37	41.39	41.24	41.48	41.28	41.22	41.18	41.17	41.18	41.21	41.20	41.27	41.85	40.94
1998	41.23	41.25	41.31	41.45	41.21	41.18	41.18	41.15	41.14	41.15	41.15	41.20	41.21	42.06	41.04
1999	41.27	41.32	41.31	41.22	41.21	41.25	41.23	41.19	41.18	41.26	---	---	---	41.49	40.86
2000	41.31	41.29	41.07	41.30	41.40	41.30	41.26	41.23	41.21	41.18	41.20	41.19	41.24	41.61	40.55
2001	41.23	41.27	41.24	41.20	41.28	41.24	41.19	41.18	41.18	41.28	41.37	41.40	41.25	41.48	40.91
2002	41.40	41.32	41.36	41.29	41.48	41.45	41.26	41.16	41.14	41.13	41.13	41.14	41.27	41.77	40.93
2003	41.13	41.12	41.19	41.31	41.24	41.22	41.17	41.21	41.16	41.24	41.45	41.64	41.26	41.94	41.03
2004	41.69	41.53	41.45	41.46	41.40	41.26	41.22	41.11	41.14	41.11	41.11	41.13	41.30	41.89	40.96
2005	41.22	41.17	41.10	41.41	41.28	41.21	41.16	41.14	41.10	41.19	41.17	---	41.20	41.55	40.94
2006	41.44	41.52	41.43	41.36	41.44	41.34	41.25	41.20	41.18	41.29	41.40	41.41	41.36	41.82	41.17
2007	41.30	41.45	41.46	41.34	41.28	41.35	41.21	41.19	41.18	41.16	41.15	41.19	41.27	41.57	41.07
2008	41.33	41.41	41.43	41.71	41.43	41.39	41.38	41.34	41.23	41.21	41.24	41.33	41.37	41.95	41.07
2009	41.43	41.43	41.46	41.45	41.47	41.33	41.30	41.28	41.19	41.19	41.29	41.25	41.34	41.79	41.10
2010	41.28	41.28	41.33	41.24	41.20	41.19	41.16	41.16	41.22	41.28	41.29	41.52	41.26	41.76	40.93
2011	41.38	41.33	41.40	41.30	41.44	41.30	41.25	41.20	41.20	41.20	41.19	41.26	41.29	41.60	40.98
2012	41.30	41.33	41.39	41.32	41.25	41.21	41.17	41.16	41.17	41.21	41.27	41.28	41.25	41.56	41.04
2013	41.31	41.38	41.34	41.46	41.54	41.41	41.22	41.20	41.20	41.24	41.40	41.32	41.34	41.71	41.13
2014	41.36	41.35	41.22	41.43	41.51	41.32	41.23	41.22	41.26	41.33	41.30	41.31	41.32	41.67	41.09
2015	41.49	41.36	41.29	41.29	41.31	41.25	41.18	41.20	41.21	41.19	41.23	41.31	41.28	41.69	41.08
2016	41.65	41.80	41.67	41.53	41.40	41.28	41.20	41.19	41.19	41.19	41.18	41.24	41.38	42.10	41.02
2017	41.29	41.34	41.44	41.77	42.00	41.38	41.31	41.23	41.23	41.21	41.32	41.37	41.41	42.81	41.10
2018	41.47	41.42	41.33	41.26	41.50	41.28	41.19	41.15	41.22	41.28	41.27	41.30	41.30	41.78	41.03
2019	41.32	41.41	41.34	41.82	42.33	41.42	41.17	41.13	41.14	41.01	41.21	41.27	41.38	42.75	40.88
2020	41.29	41.26	41.39	41.44	41.33	41.27	41.19	41.22	41.25	41.31	41.32	41.36	41.30	41.80	40.99
2021	41.66	41.46	41.35	41.23	41.18	41.17	41.23	41.19	41.21	41.28	41.24	41.34	41.29	41.83	41.03
2022	41.33	41.32	41.43	41.41	41.44	41.50	41.23	41.21	---	41.22	41.20	41.26	41.32	41.73	41.06
2023	41.52	41.52	41.38	41.64	41.70	41.21	41.21	41.22	41.20	41.28	41.31	41.34	41.38	42.41	41.00
Mean - Moyenne	40.76	40.75	40.81	41.19	41.20	40.92	40.73	40.62	40.60	40.67	40.73	40.76	40.81	43.20 (max)	38.87 (min)
Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Means	Daily Maximum	Daily Minimum

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