20 September 2015

Annual hydrographs of Flathead Lake 1908 – 2015

The hydrographs open in a small window, and use the federal water year, which runs from the beginning of October through the end of September, and is named for the year in which it ends. Somers data were used for 1928-1998. Polson data were used for 1911-1926 and 1998-2005. Hydrographs for 1908-1910, parts of 1916 & 1917, 1919, parts of 1923-1926 & 1928, and all of 1927, were generated from lake levels that were estimated from streamflow data from the gauge on the Flathead River below Polson. Calculated levels are displayed in red. Measured levels are displayed in blue. An informal comparison of the gauges indicates a difference of approximately one-tenth-foot, with the higher number at Somers. The difference is of no practical consequence for the purposes of this page

2015 2014 2013 2012 2011 2010	2009 2008 2007 2006 2005 2004 2003 2002 2001 2000	1999 1998 1997 1996 1995 1994 1993 1992 1991 1990	1989 1988 1987 1986 1985 1984 1983 1982 1981 1980	1979 1978 1977 1976 1975 1974 1973 1972 1971 1970	1969 1968 1967 1966 1965 1964 1963 1962 1961 1960
1959 1958 1957 1956 1955 1954 1953 1952 1951 1950	1949 1948 1947 1946 1945 1944 1943 1942 1941 1940	1939 1938 1937 1936 1935 1934 1933 1932 1931 1930	1929 1928 1927 1926 1925 1924 1923 1922 1921 1920	1919 1918 1917 1916 1915 1914 1913 1912 1911 1910	1909 1908