National Water Conditions
U.S. Geological Survey
Environment Canada Climate Information Branch
Historical Maps of Monthly and Annual Streamflow Conditions by Water Year
Explanation of monthly and annual streamflow map content
Monthly
(Water Year)
Streamflow Maps
2000
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2001
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2002
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1990
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1991
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1992
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1993
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1994
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1995
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1996
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1997
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1998
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1999
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1980
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1981
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1982
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1983
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1984
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1985
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1986
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1987
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1988
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1989
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1970
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1971
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1972
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1973
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1974
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1975
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1976
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1977
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1978
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1979
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1960
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1961
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1962
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1963
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1964
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1965
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1966
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1967
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1968
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1969
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1950
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1951
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1952
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1953
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1954
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1955
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1956
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1957
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1958
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1959
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1945
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1946
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1947
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1948
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1949
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Animation of Monthly
(Water Year)
Streamflow Maps
2000
1990
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1991
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1992
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1993
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1994
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1995
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1996
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1997
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1998
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1999
1980
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1981
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1982
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1983
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1984
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1985
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1986
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1987
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1988
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1989
1970
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1971
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1972
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1973
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1974
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1975
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1976
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1977
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1978
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1979
1960
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1961
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1962
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1963
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1964
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1965
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1966
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1967
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1968
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1969
1950
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1951
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1952
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1953
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1954
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1955
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1956
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1957
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1958
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1959
1944
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1945
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1946
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1947
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1948
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1949
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Annual
(Water Year)
Streamflow Maps
1990
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1991
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1992
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1993
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1994
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1995
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1996
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1980
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1981
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1982
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1983
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1984
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1985
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1986
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1987
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1988
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1989
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1970
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1971
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1972
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1973
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1974
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1975
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1976
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1977
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1978
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1979
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1960
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1961
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1962
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1963
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1964
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1965
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1966
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1967
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1968
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1969
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1950
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1951
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1952
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1953
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1954
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1955
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1956
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1957
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1958
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1959
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1940
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1941
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1942
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1943
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1944
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1945
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1946
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1947
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1948
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1949
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1930
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1931
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1932
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1933
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1934
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1935
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1936
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1937
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1938
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1939
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1921
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1922
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1923
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1924
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1925
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1926
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1927
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1928
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1929
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Animation of Annual (Water Year) Streamflow Maps
1921-1996
Explanation of monthly and annual streamflow map content
U.S. Department of the Interior
,
U.S. Geological Survey
Maintainer:
Water Webserver Team
Last update: 09:38:55 Thu 27 Feb 2003
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URL: http://water.usgs.gov/nwc/