Ottawa River at Britannia
| 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 | 57.97 | 58.00 | 57.96 | 58.45 | 58.80 | 58.27 | 58.01 | 57.85 | 57.88 | 57.86 | 58.02 | 58.09 | 58.10 | 59.07 | 57.76 | |
| 1951 | 58.03 | 58.07 | 58.26 | 59.59 | 58.90 | 58.13 | 58.20 | 57.89 | 57.91 | 58.31 | 58.78 | 58.47 | 58.38 | 60.21 | 57.80 | |
| 1952 | 58.29 | 58.20 | 58.26 | 58.90 | 58.90 | 58.48 | 57.97 | 57.94 | 57.97 | 57.95 | 57.91 | 58.08 | 58.24 | 59.34 | 57.74 | |
| 1953 | 58.12 | 58.18 | 58.46 | 59.12 | 58.46 | 58.05 | 57.90 | 57.83 | 57.76 | 57.82 | 57.78 | 57.85 | 58.11 | 59.49 | 57.67 | |
| 1954 | 57.89 | 57.89 | 58.18 | 58.74 | 58.56 | 58.61 | 58.27 | 58.01 | 58.01 | 58.60 | 58.53 | 58.41 | 58.31 | 59.28 | 57.71 | |
| 1955 | 58.25 | 58.15 | 58.10 | 59.04 | 58.44 | 58.00 | 57.87 | 57.76 | 57.73 | 57.87 | 58.40 | 58.20 | 58.15 | 59.59 | 57.61 | |
| 1956 | 58.06 | 58.00 | 57.99 | 58.53 | 58.81 | 58.57 | 58.24 | 58.16 | 58.36 | 58.44 | 58.19 | 58.17 | 58.29 | 59.08 | 57.90 | |
| 1957 | 58.12 | 58.13 | 58.21 | 58.34 | 58.40 | 58.20 | 58.82 | 58.04 | 58.12 | 58.24 | 58.46 | 58.46 | 58.30 | 59.41 | 57.85 | |
| 1958 | 58.36 | 58.30 | 58.38 | 58.63 | 58.20 | 58.08 | 58.08 | 57.89 | 57.95 | 58.07 | 58.30 | 58.22 | 58.21 | 58.86 | 57.84 | |
| 1959 | 58.10 | 58.06 | 58.01 | 58.58 | 58.72 | 58.20 | 57.91 | 57.84 | 57.97 | 58.08 | 58.46 | 58.44 | 58.20 | 58.96 | 57.79 | |
| 1960 | 58.28 | 58.30 | 58.25 | 58.99 | 59.68 | 58.47 | 58.70 | 58.28 | 57.98 | 58.01 | 58.08 | 58.06 | 58.42 | 60.14 | 57.93 | |
| 1961 | 58.02 | 57.95 | 57.97 | 58.32 | 58.52 | 58.25 | 58.13 | 58.04 | 58.03 | 58.13 | 58.06 | 58.18 | 58.14 | 58.68 | 57.86 | |
| 1962 | 58.17 | 58.22 | 58.10 | 58.60 | 58.77 | 58.15 | 57.82 | 57.72 | 57.74 | 57.79 | 57.84 | 57.79 | 58.06 | 59.27 | 57.63 | |
| 1963 | 57.79 | 57.85 | 57.91 | 58.57 | 58.36 | 58.13 | 57.87 | 57.72 | 57.87 | 57.84 | 57.91 | 58.16 | 58.00 | 58.74 | 57.62 | |
| 1964 | 58.15 | 58.13 | 58.23 | 58.50 | 58.53 | 58.33 | 58.06 | 57.82 | 57.74 | 57.84 | 57.87 | 57.96 | 58.10 | 58.96 | 57.69 | |
| 1965 | 58.04 | 58.04 | 58.09 | 58.35 | 58.90 | 58.21 | 57.90 | 58.03 | 58.37 | 58.83 | 58.56 | 58.48 | 58.32 | 59.07 | 57.80 | |
| 1966 | 58.46 | 58.34 | 58.51 | 58.82 | 58.71 | 58.55 | 58.03 | 58.14 | 57.99 | 58.12 | 58.38 | 59.10 | 58.43 | 59.55 | 57.88 | |
| 1967 | 58.53 | 58.50 | 58.19 | 59.16 | 59.18 | 58.83 | 58.39 | 58.01 | 57.96 | 58.28 | 58.77 | 58.48 | 58.52 | 59.77 | 57.86 | |
| 1968 | 58.39 | 58.29 | 58.35 | 58.91 | 58.22 | 58.15 | 58.20 | 58.02 | 58.03 | 58.00 | 58.01 | 58.02 | 58.22 | 59.20 | 57.90 | |
| 1969 | 58.09 | 58.15 | 58.19 | 58.72 | 59.05 | 58.54 | 58.18 | 58.11 | 57.95 | 58.02 | 58.55 | 58.40 | 58.33 | 59.24 | 57.85 | |
| 1970 | 58.22 | 58.15 | 58.19 | 58.47 | 59.00 | 58.72 | 58.65 | 58.32 | 58.04 | 58.10 | 58.17 | 58.20 | 58.35 | 59.22 | 57.90 | |
| 1971 | 58.16 | 58.13 | 58.22 | 58.74 | 59.00 | 58.24 | 57.82 | 57.88 | 57.75 | 57.78 | 57.88 | 58.05 | 58.14 | 59.65 | 57.62 | |
| 1972 | 58.20 | 58.20 | 58.29 | 58.61 | 59.39 | 58.53 | 58.36 | 58.29 | 58.25 | 58.22 | 58.49 | 58.35 | 58.43 | 59.80 | 58.05 | |
| 1973 | 58.29 | 58.34 | 58.72 | 59.21 | 59.07 | 58.67 | 58.35 | 58.04 | 57.96 | 58.14 | 58.22 | 58.30 | 58.44 | 59.52 | 57.87 | |
| 1974 | 58.22 | 58.20 | 58.46 | 58.91 | 59.67 | 59.04 | 58.40 | 57.98 | 57.91 | 58.04 | 58.39 | 58.38 | 58.47 | 59.99 | 57.86 | |
| 1975 | 58.31 | 58.30 | 58.33 | 58.51 | 58.76 | 58.44 | 57.94 | 57.76 | 57.77 | 57.89 | 57.94 | 58.21 | 58.18 | 59.47 | 57.68 | |
| 1976 | 58.17 | 58.14 | 58.40 | 59.42 | 59.09 | 58.35 | 58.11 | 57.95 | 57.87 | 57.96 | 57.98 | 58.13 | 58.30 | 59.70 | 57.80 | |
| 1977 | 58.11 | 58.08 | 58.48 | 58.99 | 58.53 | 57.96 | 57.97 | 57.80 | 57.81 | 57.98 | 58.17 | 58.42 | 58.19 | 59.35 | 57.74 | |
| 1978 | 58.33 | 58.35 | 58.21 | 58.59 | 58.89 | 58.24 | 57.93 | 57.81 | 57.77 | 58.09 | 58.11 | 58.12 | 58.20 | 59.38 | 57.67 | |
| 1979 | 58.20 | 58.20 | 58.47 | 59.21 | 59.64 | 58.61 | 58.18 | 58.08 | 58.02 | 58.37 | 58.62 | 58.76 | 58.53 | 60.24 | 57.91 | |
| 1980 | 58.52 | 58.34 | 58.39 | 59.03 | 58.91 | 58.15 | 58.14 | 58.09 | 57.98 | 58.44 | 58.49 | 58.35 | 58.40 | 59.48 | 57.85 | |
| 1981 | 58.20 | 58.44 | 58.84 | 59.28 | 58.69 | 58.58 | 58.12 | 57.87 | 58.19 | 58.25 | 58.38 | 58.21 | 58.42 | 59.62 | 57.73 | |
| 1982 | 58.14 | 58.15 | 58.22 | 58.63 | 58.52 | 58.14 | 57.92 | 57.71 | 57.73 | 57.88 | 58.23 | 58.56 | 58.15 | 59.28 | 57.61 | |
| 1983 | 58.59 | 58.46 | 58.56 | 58.73 | 59.33 | 58.84 | 57.97 | 57.83 | 57.72 | 57.90 | 58.15 | 58.29 | 58.36 | 59.95 | 57.66 | |
| 1984 | 58.29 | 58.40 | 58.46 | 59.12 | 58.78 | 58.67 | 58.40 | 58.02 | 57.94 | 57.94 | 58.39 | 58.48 | 58.41 | 59.40 | 57.81 | |
| 1985 | 58.48 | 58.40 | 58.56 | 58.93 | 59.25 | 58.19 | 58.11 | 58.19 | 57.89 | 57.89 | 58.05 | 58.23 | 58.35 | 59.97 | 57.77 | |
| 1986 | 58.20 | 58.29 | 58.21 | 58.96 | 58.69 | 58.38 | 57.97 | 57.95 | 57.93 | 58.22 | 58.34 | 58.22 | 58.28 | 59.20 | 57.74 | |
| 1987 | 58.22 | 58.19 | 58.20 | 58.82 | 57.99 | 57.86 | 57.75 | 57.71 | 57.58 | 57.63 | 57.90 | 58.16 | 58.00 | 59.16 | 57.50 | |
| 1988 | 58.26 | 58.32 | 58.14 | 59.00 | 58.81 | 58.02 | 57.75 | 57.87 | 58.02 | 58.43 | 58.80 | 58.50 | 58.33 | 59.22 | 57.64 | |
| 1989 | 58.42 | 58.46 | 58.19 | 58.69 | 58.90 | 58.82 | 58.03 | 57.77 | 57.68 | 57.60 | 57.99 | 58.23 | 58.23 | 59.17 | 57.52 | |
| 1990 | 58.27 | 58.35 | 58.48 | 58.79 | 58.75 | 58.20 | 58.14 | 57.81 | 57.75 | 58.30 | 58.49 | 58.79 | 58.34 | 59.25 | 57.69 | |
| 1991 | 58.52 | 58.48 | 58.41 | 59.31 | 58.64 | 58.04 | 57.79 | 57.68 | 57.70 | 57.84 | 58.08 | 58.36 | 58.24 | 59.64 | 57.63 | |
| 1992 | 58.29 | 58.33 | 58.17 | 58.56 | 58.81 | 57.99 | 57.89 | 57.78 | 58.08 | 58.26 | 58.70 | 58.51 | 58.28 | 59.52 | 57.73 | |
| 1993 | 58.43 | 58.36 | 58.14 | 58.58 | 58.23 | 58.37 | 57.88 | 57.73 | 57.77 | 58.24 | 58.48 | 58.40 | 58.22 | 58.80 | 57.61 | |
| 1994 | 58.23 | 58.36 | 58.29 | 58.44 | 58.53 | 58.39 | 58.41 | 58.14 | 57.91 | 57.95 | 58.26 | 58.28 | 58.27 | 58.93 | 57.83 | |
| 1995 | 58.54 | 58.44 | 58.52 | 58.28 | 58.68 | 58.56 | 57.94 | 57.90 | 57.68 | 57.76 | 58.37 | 58.37 | 58.25 | 59.22 | 57.60 | |
| 1996 | 58.38 | 58.47 | 58.37 | 58.68 | 59.46 | 58.47 | 58.28 | 58.15 | 57.89 | 57.92 | 58.19 | 58.29 | 58.38 | 59.82 | 57.85 | |
| 1997 | 58.43 | 58.53 | 58.53 | 59.04 | 59.46 | 58.39 | 58.15 | 57.81 | 57.85 | 57.97 | 58.11 | 58.09 | 58.36 | 59.82 | 57.74 | |
| 1998 | 58.20 | 58.32 | 58.41 | 59.38 | 58.08 | 57.92 | 57.90 | 57.72 | 57.69 | 57.73 | 57.81 | 58.09 | 58.10 | 59.97 | 57.65 | |
| 1999 | 58.29 | 58.39 | 58.32 | 58.68 | 57.83 | 58.11 | 58.12 | 57.84 | 57.77 | 58.28 | 58.66 | 58.76 | 58.25 | 59.31 | 57.67 | |
| 2000 | 58.46 | 58.44 | 58.53 | 58.66 | 58.55 | 58.25 | 58.10 | 58.08 | 57.92 | 57.86 | 57.94 | 58.19 | 58.25 | 59.00 | 57.73 | |
| 2001 | 58.21 | 58.27 | 58.27 | 58.71 | 58.41 | 58.20 | 57.84 | 57.63 | 57.71 | 58.44 | 58.76 | 58.83 | 58.27 | 59.15 | 57.55 | |
| 2002 | 58.52 | 58.40 | 58.48 | 59.12 | 59.10 | 58.88 | 58.22 | 57.81 | 57.69 | 57.71 | 57.81 | 57.86 | 58.30 | 59.97 | 57.62 | |
| 2003 | 57.97 | 58.11 | 58.13 | 58.48 | 58.29 | 58.34 | 58.02 | 58.05 | 57.83 | 58.20 | 58.83 | 58.77 | 58.25 | 59.23 | 57.72 | |
| 2004 | 58.57 | 58.40 | 58.43 | 58.91 | 59.12 | 58.41 | 58.47 | 57.90 | 57.85 | 57.77 | 57.92 | 58.16 | 58.33 | 59.38 | 57.63 | |
| 2005 | 58.33 | 58.28 | 58.13 | 59.10 | 58.50 | 58.12 | 57.84 | 57.69 | 57.58 | 57.76 | 58.08 | 58.43 | 58.15 | 59.44 | 57.44 | |
| 2006 | 58.42 | 58.46 | 58.50 | 59.28 | 58.54 | 58.19 | 57.94 | 57.90 | 57.83 | 58.44 | 58.83 | 58.92 | 58.43 | 59.57 | 57.75 | |
| 2007 | 58.79 | 58.48 | 58.37 | 58.62 | 58.26 | 58.43 | 58.07 | 57.75 | 57.63 | 57.59 | 57.76 | 58.00 | 58.14 | 58.97 | 57.56 | |
| 2008 | 58.50 | 58.47 | 58.37 | 59.19 | 59.07 | 58.59 | 58.56 | 58.38 | 58.07 | 58.01 | 58.20 | 58.35 | 58.48 | 59.68 | 57.96 | |
| 2009 | 58.55 | 58.52 | 58.55 | 59.21 | 59.13 | 58.58 | 58.21 | 58.29 | 57.95 | 58.05 | 58.46 | 58.47 | 58.50 | 59.58 | 57.82 | |
| 2010 | 58.35 | 58.39 | 58.49 | 58.17 | 57.86 | 57.74 | 57.68 | 57.59 | 57.79 | 58.25 | 58.25 | 58.62 | 58.10 | 58.86 | 57.51 | |
| 2011 | 58.51 | 58.40 | 58.36 | 58.76 | 59.10 | 58.45 | 58.14 | 57.80 | 57.66 | 57.74 | 58.08 | 58.36 | 58.28 | 59.58 | 57.53 | |
| 2012 | 58.39 | 58.39 | 58.78 | 58.63 | 58.25 | 57.90 | 57.61 | 57.62 | 57.64 | 57.98 | 58.57 | 58.37 | 58.18 | 59.51 | 57.55 | |
| 2013 | 58.44 | 58.57 | 58.43 | 58.98 | 59.49 | 58.89 | 58.02 | 57.85 | 57.89 | 58.12 | 58.72 | 58.42 | 58.48 | 59.77 | 57.75 | |
| 2014 | 58.40 | 58.44 | 58.16 | 58.78 | 59.50 | 58.54 | 58.12 | 57.94 | 58.23 | 58.60 | 58.72 | 58.58 | 58.50 | 59.74 | 57.85 | |
| 2015 | 58.56 | 58.45 | 58.27 | 58.66 | 58.68 | 58.33 | 57.88 | 57.78 | 57.78 | 57.73 | 58.08 | 58.57 | 58.23 | 59.33 | 57.65 | |
| 2016 | 58.76 | 58.62 | 58.95 | 59.37 | 58.88 | 58.27 | 57.86 | 57.80 | 57.73 | 57.77 | 57.82 | 58.06 | 58.32 | 59.61 | 57.68 | |
| 2017 | 58.27 | 58.42 | 58.73 | 59.40 | 59.76 | 58.83 | 58.54 | 58.12 | 58.16 | 58.00 | 58.39 | 58.46 | 58.59 | 60.44 | 57.94 | |
| 2018 | 58.47 | 58.48 | 58.33 | 58.30 | 59.31 | 58.50 | 57.86 | 57.88 | 58.15 | 58.52 | 58.56 | 58.41 | 58.40 | 59.80 | 57.68 | |
| 2019 | 58.44 | 58.49 | 58.35 | 59.21 | 60.35 | 59.16 | 58.12 | 57.75 | 57.67 | 57.75 | 58.30 | 58.24 | 58.48 | 60.68 | 57.60 | |
| 2020 | 58.38 | 58.40 | 58.46 | 59.23 | 58.74 | 58.34 | 58.04 | 58.04 | 58.18 | 58.41 | 58.59 | 58.48 | 58.44 | 59.59 | 57.89 | |
| 2021 | 58.50 | 58.47 | 58.49 | 58.41 | 58.08 | 57.78 | 58.08 | 57.95 | 57.83 | 58.30 | 58.16 | 58.30 | 58.20 | 59.07 | 57.55 | |
| 2022 | 58.43 | 58.35 | 58.40 | 59.07 | 58.97 | 58.84 | 58.06 | 57.92 | --- | 58.15 | 58.17 | 58.33 | 58.42 | 59.45 | 57.76 | |
| 2023 | 58.58 | 58.53 | 58.37 | 59.25 | 59.45 | 58.23 | 58.05 | 57.99 | 58.03 | 58.36 | 58.64 | 58.34 | 58.49 | 60.35 | 57.89 | |
| Mean - Moyenne | 58.31 | 58.30 | 58.34 | 58.84 | 58.82 | 58.36 | 58.08 | 57.92 | 57.89 | 58.06 | 58.27 | 58.33 | 58.30 | 60.68 (max) | 57.44 (min) | |
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual Means | Daily Maximum | Daily Minimum | |