USGS Science for a changing world
Category:
Geographic area:
Water Watch Home
Water Resources

WaterWatch -- Current water resources conditions

Map of flood and high flow conditions (United States)

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 95th-98th percentile color code for river greater than 99th percentile color code for river above flood stage
95 - 98 > 99 River above flood stage

The "Flood and high flow" map shows the location of streamgages where the water level is currently at or above flood stage (depicted as a black triangle) or at high flow (depicted as blue circles). The high flow conditions are expressed as percentiles that compare the current (i.e., within the past several hours) instantaneous flow value to historical daily mean flow values for all days of the year. Please note that flood conditions may be more extensive than shown on the map because the National Weather Service (NWS) has not identified a flood stage (for flood forecasting purposes) at all USGS streamgaging sites. Also, the NWS has determined flood stages for some non-USGS streamgaging sites, which are not shown on the map. The most complete depiction of streamgages at or above flood stage is on the NWS River Conditions Map.
The real-time data used to produce this map are provisional and have not been reviewed or edited. They may be subject to significant change. Also, in this regard, during winter months the flood and high flows appearing on the map in some states may result from ice effects.
A postscript file of this map is available here.

We want your feedback || Privacy Statement || Disclaimer
U.S. Department of the Interior || U.S. Geological Survey
URL: http://water.usgs.gov/cgi-bin/waterwatch?state=us↦_type=flood&web;_type=map;
Maintainer:
Office of Surface Water.  
Last modified: 10:27:55 Sat 30 October 2004

FirstGov, 'Your First Click to the U. S. Government'