This hydrologic hazards map displays sites where the USGS is currently collecting and reporting water data in near real-time. The sites include 1) long-term streamgages (i.e., those with at least 30 years of observations), which are indicated by a colored square with the color representing percentile classes for this day of the year; 2) shorter-term streamgages (those with less than 30 years of observations) or those only reporting water level and not streamflow, which are indicated by a gray square; 3) special storm surge sensors that have been deployed in anticipation of a specific flood or storm surge event (red triangle); 4) ground water wells (black triangle); 5) water quality sensors (red circle); combined surface water quality and streamflow sites (square inside red circle); and ground water quality site (black triangle inside red circle). This webpage is designed to highlight and provide access to current water quantity and quality conditions in areas undergoing, or at risk of undergoing severe environmental conditions (e.g., hurricanes, extratropical storms, etc.), although it can also be used to access water data in all other areas of the conterminous United States.

Notes for navigating this webpage

The shaded box or boxes on the national map represent areas where an existing or imminent hazardous event is, or may possibly occur. Clicking the box will produce a more detailed map for that area showing the location of USGS real-time water monitoring sites. Holding the mouse over a given site produces a pop-up box containing the site number and name. Clicking on the site produces a text balloon containing the most recent data for the variables being measured. Clicking on the site information contained within the text balloon will take you to the USGS hydrologic database where you can explore and retrieve recent and historical information for the site.

To create a zoom box for some other area of the United States, click on the ‘Create zoom box’ button and then click and drag a box across the area of interest.

The data used to produce this map are provisional and have not been reviewed or edited. They may be subject to significant change. Moreover, the storm events and related flood conditions affecting the monitoring stations appearing on the map may be severe enough to damage or destroy equipment, or to disrupt the transmission of data from the station to USGS computer systems. As a result, some of the information appearing on the map may not reflect conditions occurring at the present time.

This product is formatted in Google Maps.