Ottawa River at Mattawa

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
1950	150.95	151.08	151.11	151.13	152.52	152.20	152.59	152.61	152.22	152.40	152.40	151.80	151.92	153.46	150.76
1951	151.86	151.96	151.86	153.41	152.91	152.32	152.42	152.06	152.22	152.95	153.29	153.02	152.52	154.47	151.38
1952	152.57	152.26	152.04	151.97	152.89	152.73	151.89	152.33	152.13	151.96	152.33	152.45	152.30	153.69	151.19
1953	152.62	152.53	152.74	153.38	152.57	152.47	152.46	152.41	152.40	152.50	152.12	152.52	152.56	154.14	151.65
1954	152.58	152.47	152.48	152.00	151.79	152.99	152.51	152.42	152.54	153.20	153.07	152.82	152.57	154.26	150.68
1955	152.58	152.62	152.26	151.88	152.45	152.13	151.97	151.95	151.83	152.15	152.87	152.70	152.28	153.35	150.96
1956	152.17	152.10	151.67	151.65	152.55	152.89	152.72	152.56	152.74	153.06	152.62	152.42	152.43	153.87	150.22
1957	152.36	152.54	152.44	152.36	152.76	152.57	153.45	151.90	152.36	152.57	152.90	152.87	152.59	154.63	151.01
1958	152.75	152.72	152.56	151.40	151.52	152.23	152.30	151.96	152.01	152.50	152.68	152.60	152.27	153.08	150.26
1959	152.14	152.13	151.92	151.52	152.58	152.45	152.02	151.78	152.26	152.43	152.85	152.85	152.24	153.23	149.98
1960	152.73	152.77	152.45	152.30	154.62	153.00	153.34	152.80	152.71	152.75	152.81	152.68	152.91	155.78	151.44
1961	152.68	152.53	152.35	152.19	152.45	152.73	152.60	152.56	152.56	152.71	152.59	152.67	152.55	153.04	151.43
1962	152.75	152.67	152.50	152.18	152.78	152.46	151.91	151.90	152.36	152.58	152.48	152.43	152.42	153.31	151.52
1963	152.39	152.60	152.46	151.73	152.19	152.46	152.08	152.34	152.53	152.57	152.58	152.68	152.38	152.91	150.88
1964	152.79	152.76	152.34	151.78	152.77	152.91	152.63	152.55	152.49	152.61	152.62	152.68	152.58	153.53	150.78
1965	152.74	152.77	152.22	151.25	152.62	152.70	152.49	152.63	153.02	153.38	152.91	152.76	152.63	154.00	150.21
1966	152.82	152.82	152.34	152.34	152.62	152.86	152.63	152.74	152.65	152.81	153.11	153.63	152.78	154.19	151.73
1967	153.02	153.24	152.35	152.81	153.48	153.36	152.75	152.62	152.60	152.59	152.92	152.76	152.87	154.38	152.00
1968	152.83	152.77	152.38	152.14	152.28	152.64	152.60	152.67	152.66	152.69	152.54	152.46	152.55	153.05	151.21
1969	152.50	152.54	152.17	151.81	152.74	152.88	152.68	152.71	152.64	152.74	153.17	152.93	152.63	153.57	151.23
1970	152.81	152.75	152.26	151.62	152.66	153.30	153.35	152.89	152.75	152.76	152.73	152.78	152.72	153.89	151.08
1971	152.75	152.75	152.33	151.87	152.71	152.60	152.34	152.46	152.12	152.22	152.43	152.60	152.43	153.02	151.06
1972	152.67	152.68	152.44	151.58	152.86	152.71	152.56	152.66	152.58	152.69	152.78	152.68	152.58	153.17	151.03
1973	152.67	152.76	152.44	152.73	153.18	152.94	152.75	152.51	152.58	152.63	152.80	152.74	152.73	153.87	151.77
1974	152.58	152.62	152.43	152.07	153.54	153.49	153.01	152.58	152.47	152.59	152.84	152.76	152.75	154.06	151.30
1975	152.71	152.78	152.15	151.51	152.65	152.96	152.51	152.40	152.37	152.45	152.50	152.68	152.47	153.37	150.75
1976	152.67	152.68	152.22	153.11	153.53	152.65	152.59	152.48	152.45	152.52	152.49	152.67	152.67	154.02	151.40
1977	152.67	152.66	151.86	152.95	152.88	152.53	152.56	152.44	152.50	152.52	152.69	152.76	152.58	153.69	151.43
1978	152.75	152.83	151.81	151.18	152.49	152.63	152.52	152.43	152.44	152.63	152.64	152.64	152.41	152.99	150.79
1979	152.67	152.71	152.04	152.56	154.06	153.12	152.70	152.67	152.62	152.67	153.10	153.11	152.84	154.85	151.55
1980	153.05	152.82	151.83	152.41	153.19	152.43	152.55	152.41	152.51	152.73	152.77	152.76	152.62	153.88	151.21
1981	152.60	152.72	152.33	153.25	152.87	152.91	152.59	152.51	152.57	152.60	152.68	152.63	152.69	154.05	151.78
1982	152.68	152.72	151.87	151.51	152.46	152.56	152.48	152.44	152.37	152.49	152.72	152.87	152.43	153.06	150.69
1983	152.95	152.83	152.30	151.94	153.37	153.24	152.53	152.46	152.23	152.51	152.66	152.67	152.64	154.34	151.62
1984	152.80	152.77	151.92	152.15	152.66	153.01	152.72	152.45	152.47	152.51	152.87	152.92	152.60	153.53	151.24
1985	152.89	152.75	151.92	151.92	153.24	152.66	152.80	152.69	152.50	152.47	152.53	152.63	152.58	153.76	151.21
1986	152.66	152.82	151.61	152.43	152.96	152.65	152.46	152.40	152.41	152.58	152.59	152.55	152.51	153.30	151.07
1987	152.63	152.73	151.59	151.85	152.11	152.10	152.18	152.21	151.95	151.99	152.42	152.61	152.20	152.97	150.90
1988	152.75	152.79	151.70	152.42	152.93	152.48	152.38	152.59	152.64	153.09	153.33	153.02	152.67	153.73	151.00
1989	152.97	152.84	151.70	151.84	152.96	153.17	152.50	152.07	152.00	151.88	152.45	152.64	152.42	153.92	151.09
1990	152.79	152.47	151.59	151.83	152.73	152.62	152.60	152.39	152.40	152.87	152.92	153.21	152.54	153.88	151.18
1991	152.91	152.90	151.81	152.46	152.67	152.45	152.35	152.29	152.35	152.51	152.67	152.66	152.50	153.28	151.15
1992	152.77	152.77	151.63	151.22	152.60	152.47	152.52	152.42	152.62	152.61	152.93	152.77	152.44	153.19	150.58
1993	152.70	152.79	151.55	151.25	152.20	152.64	152.43	152.35	152.34	152.75	152.95	152.76	152.39	153.40	150.53
1994	152.83	153.03	151.81	151.22	152.71	152.74	152.85	152.57	152.45	152.53	152.71	152.65	152.51	153.22	150.62
1995	152.81	152.57	152.03	151.50	153.10	152.93	152.39	152.35	152.32	152.34	152.58	152.73	152.47	153.88	150.97
1996	152.70	152.76	151.94	151.53	153.49	152.75	152.76	152.54	152.42	152.50	152.65	152.62	152.56	153.88	150.73
1997	152.74	152.91	152.04	152.15	153.19	152.82	152.64	152.46	152.46	152.50	152.51	152.53	152.57	153.59	150.88
1998	152.63	152.68	151.74	152.68	152.42	152.47	152.34	152.29	152.30	152.35	152.37	152.67	152.41	153.06	150.63
1999	152.73	152.76	151.77	151.84	152.34	152.73	152.54	152.47	152.44	152.86	153.07	153.08	152.56	153.41	150.68
2000	152.87	152.85	152.41	152.24	152.57	152.58	152.48	152.54	152.41	152.26	152.42	152.64	152.52	153.02	151.80
2001	152.65	152.50	151.90	152.08	152.79	152.53	152.36	152.24	152.34	153.14	153.29	153.27	152.59	153.73	150.51
2002	152.98	152.84	152.09	152.49	153.23	153.11	152.60	152.48	152.36	152.46	152.38	152.43	152.62	153.85	151.25
2003	152.68	152.75	151.94	151.59	152.29	152.51	152.53	152.63	152.36	152.67	152.95	152.88	152.48	153.44	151.11
2004	152.87	152.86	151.88	152.21	153.13	152.63	153.07	152.41	152.38	152.35	152.37	152.60	152.56	154.04	151.30
2005	152.64	152.71	151.69	152.16	152.45	152.41	152.39	152.37	152.33	152.36	152.66	152.82	152.41	153.01	150.89
2006	152.84	152.87	152.04	152.76	152.61	152.47	152.42	152.38	152.36	152.76	153.01	153.13	152.64	153.40	151.36
2007	153.05	152.80	151.89	151.66	152.35	152.79	152.57	152.29	152.30	152.25	152.43	152.43	152.40	153.37	151.27
2008	152.61	152.83	151.83	151.84	153.16	152.95	152.94	152.70	152.55	152.50	152.64	152.67	152.60	153.48	150.93
2009	152.80	152.81	151.82	152.52	153.44	152.88	152.63	152.62	152.42	152.60	152.87	152.62	152.67	153.83	151.31
2010	152.60	152.75	151.80	151.99	152.28	152.32	152.28	152.26	152.47	152.61	152.54	152.63	152.37	153.22	151.21
2011	152.80	152.71	151.42	151.73	152.90	152.55	152.50	152.38	152.33	152.35	152.56	152.54	152.40	153.18	151.11
2012	152.81	152.82	152.35	152.56	152.42	152.36	152.23	152.31	152.35	152.61	152.97	152.65	152.53	153.47	151.82
2013	152.62	152.84	151.74	152.00	153.66	153.14	152.33	152.47	152.48	152.54	153.27	152.76	152.65	154.14	151.35
2014	152.71	152.80	151.51	151.63	153.56	152.67	152.53	152.49	152.75	153.13	153.13	152.86	152.65	154.33	150.81
2015	153.02	152.87	151.95	151.90	152.92	152.58	152.36	152.44	152.44	152.40	152.64	153.09	152.55	153.58	150.94
2016	153.11	152.88	152.65	152.59	152.80	152.60	152.43	152.40	152.41	152.44	152.35	152.36	152.58	153.33	152.15
2017	152.68	152.80	152.01	152.43	153.43	152.96	152.52	152.50	152.57	152.46	152.54	152.73	152.63	153.95	151.40
2018	152.82	152.68	151.40	150.88	152.92	152.61	152.34	152.39	152.65	153.28	152.98	152.74	152.47	153.81	150.44
2019	152.68	152.78	151.54	151.99	154.94	153.44	152.32	152.33	152.37	152.40	152.59	152.65	152.67	155.55	151.16
2020	152.74	152.71	151.51	152.30	152.81	152.66	152.49	152.40	152.54	152.92	153.07	152.75	152.57	153.58	150.99
2021	152.82	152.78	151.86	152.05	152.35	152.28	152.52	152.33	152.35	152.51	152.35	152.52	152.39	153.02	151.36
2022	152.72	152.59	151.78	152.42	153.25	153.04	152.45	152.36	---	152.56	152.63	152.66	152.58	153.69	151.35
2023	152.80	152.77	151.61	152.26	153.53	152.40	152.23	152.34	152.48	153.03	153.07	152.56	152.59	154.69	150.87
Mean - Moyenne	152.69	152.69	152.00	152.06	152.86	152.71	152.53	152.42	152.43	152.60	152.73	152.72	152.54	155.78 (max)	149.98 (min)
Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Means	Daily Maximum	Daily Minimum

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