streamflow" map tracks short-term changes (over several
hours) in rivers and streams. Although the general
appearance of the map changes very little from one hour
to the next, individual sites may change rapidly in
response to major rain events or to reservoir releases.
The map depicts
streamflow conditions as computed at
streamgages. The colors represent real-time streamflow
of historical daily streamflow for
the day of the year.
This map represents
conditions relative to those that have historically
occurred at this time of year. Only streamgages having
at least 30 years of record are used.
States containing no
dots indicate locations where flow data for the current
day are temporarily unavailable. During winter months,
some states (or parts of states) may have fewer dots
than at other times of the year due to ice effects.
The data used to produce this map are
provisional and have not been reviewed or
edited. They may be subject to significant change.