USGS Real-Time Water Data for the Nation

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News updated Nov, 2011

SYSTEM NOTICE: Friday, February 10, 2012, through Sunday February 12, 2012 there will be a planned power outage in one of our USGS facilities. This should not affect the availability of any data that we serve; however, the mapping interface which displays sites on a map will be unavailable. A follow-up notice will be sent when the power is fully restored. All real-time current data will continue to be available at http://waterdata.usgs.gov/nwis.

Daily Streamflow Conditions

Stream gage levels in The United States, relative to 30 year average.

Explanation
	High
	> 90th percentile
	76th - 90th percentile
	25th - 75th percentile
	10th - 24th percentile
	< 10th percentile
	Low
	Not ranked

The colored dots on this map depict streamflow conditions as a percentile, which is computed from the period of record for the current day of the year. Only stations with at least 30 years of record are used.

The gray circles indicate other stations that were not ranked in percentiles either because they have fewer than 30 years of record or because they report parameters other than streamflow. Some stations, for example, measure stage only.

Select a state from the map to access real-time data

Real-time data typically are recorded at 15- to 60-minute intervals, stored onsite, and then transmitted to USGS offices every 1 to 4 hours, depending on the data relay technique used. Recording and transmission times may be more frequent during critical events. Data from real-time sites are relayed to USGS offices via satellite, telephone, and/or radio telemetry and are available for viewing within minutes of arrival.

All real-time data are provisional and subject to revision.

Build Real-Time Table	Show a custom real-time summary table for one or more stations.
Build Time Series	Show custom graphs or tables for a series of recent data for one or more stations.

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U.S. Department of the Interior | U.S. Geological Survey
Title: USGS Real-Time Water Data for USA
URL: http://waterdata.usgs.gov/nwis/rt?

Page Contact Information: USGS Water Data Support Team
Page Last Modified: 2012-02-09 15:14:02 EST
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