Monthly streamflow and ground-water conditions in the United States and southern Canada, water years, 1945-85

The Water Resources Division of the U.S. Geological Survey has been measuring streamflow since 1888 and collecting ground-water data since 1894. The monthly publication Water Resources Review (now National Water Conditions) was established in water year 1945 to provide information quickly to the public on the status of surface- and ground-water resources of the Nation. Each monthly issue contains a map depicting the status of water conditions relative to normal for that month.

This report presents these maps and a synopsis of surface and ground-water conditions for the last 41 water years (194585); a water year begins October 1 and ends September 30 of the following year.