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USGS Science for a changing world
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WaterWatch -- Current water resources conditions

Map of real-time streamflow compared to historical streamflow for the day of the year (United States)
[color-codes for map]
Choose a data retrieval option and select a location on the map
List of all stations in state,   State map, or   Nearest stations
Explanation - Percentile classes
color code for new record low color code for less than 10th percentile color code for 10th - 24th percentile color code for 25th - 75th percentile color code for 76th - 90th percentile color code for greater than 90th percentile color code for new record high
Low < 10 10 - 24  25 - 75 76 - 90 > 90 High

The "Real-time 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 USGS gaging stations. The colors represent real-time streamflow compared to percentiles of historical daily streamflow for the day of the year. This map represents conditions relative to those that have historically occured at this time of year. Only stations 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.
A postscript file of this map is available here.

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Last modified: 17:38:41 Tue 24 August 2004

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