Beta version 4 has arrived!

Beta version 4 is now available for most states on a trial basis, and version 3 remains available. Beta version 4 provides a single user interface (at http://streamstatsags.cr.usgs.gov/streamstats/) for all states that are implemented, rather than separate applications for each state, as in versions 2 and 3, and the user interface is more user friendly than previous versions. Information for user-selected ungaged sites currently cannot be obtained using beta version 4 for the States of Arkansas, Arizona, Georgia, Iowa, Indiana, Maryland, North Carolina, Oregon, South Carolina, and Tennessee because of unique functionality for those states that is not yet implemented. Users are encouraged to provide comments and report bugs by use of the Help button on the interface, which also provides access to limited beta version 4 documentation. See below for additional information about versions both 3 and 4.

Please contact the StreamStats by email at support@streamstats.freshdesk.com if you have any questions.

The StreamStats Program

StreamStats is a Web application that incorporates a Geographic Information System (GIS) to provide users with access to an assortment of analytical tools that are useful for a variety of water-resources planning and management purposes, and for engineering and design purposes. In version 3 as well as beta version 4, StreamStats users can select USGS data-collection station locations shown on a map and obtain previously published information for the stations, including descriptive information, and previously published basin characteristics and streamflow statistics. Currently, StreamStats provides additional tools that allow users to select sites on ungaged streams and do the following:

obtain the drainage-basin boundary (version 3 and beta version 4),
compute selected basin characteristics (version 3 and beta version 4),
estimate selected streamflow statistics using regression equations (version 3 and beta version 4),
download a shapefile of the drainage-basin boundary, as well as any computed basin characteristics and flow statistics (version 3 and beta version 4),
edit the delineated basin boundary (beta version 4 only),
modify the basin characteristics that are used as explanatory variables in the regression equations and get new estimates of streamflow statistics (beta version 4 only),
print the map (beta version 4 only),
measure distances between user-selected points on the map (beta version 4 only),
obtain plots of the elevation profile between user-selected points on the map (beta version 4 only).

The streamflow statistics that StreamStats can provide for data-collection stations and for user-selected ungaged sites vary among the states that are implemented in StreamStats and among data-collection stations within states. Unless otherwise noted on a state’s introductory page, estimates obtained for ungaged sites assume natural flow conditions at the site.

StreamStats generally is implemented separately for each state, with the needed data preparation work accomplished through cooperative agreements with state or other agencies. When states have not been implemented, it is generally because no state or other agency has been willing to enter into a cooperative agreement with the USGS to assist with funding the needed work.

StreamStats applications for individual states are accessed separately in version 3, whereas beta version 4 provides a single national user interface for all state applications. Use the State Applications link at the left to access a web page that shows where StreamStats version 3 is available and where it is being implemented. Users can select an individual state application from the map or the pull-down list on the State Applications page to view an introductory page for the state, which contains a link to the StreamStats version 3 user interface. The introductory pages explain any unique functionality that is available for the state and provides citations to reports that document the methods implemented for the state. The StreamStats beta version 4 user interface may be accessed at http://ssdev.cr.usgs.gov/streamstats/.

Several tools, mostly related to stream-network navigation, were lost from StreamStats when version 2 was retired and version 3 was introduced on July 14, 2015, before all tools from version 2 were redeveloped for version 3. These tools allowed users to search upstream or downstream along the stream network from user-selected sites to identify stream reaches and water-related activities along the streams, such as dams and point discharges, and obtain information about those activities. In addition, users could (1) estimate flow statistics at ungaged sites based on the statistics at upstream or downstream streamgages, (2) trace the path of a drop of water that falls on any point on the land surface downstream through the stream network, and (3) obtain elevation profiles along stream channels and between points on the land surface. Version 2 was retired because it was operated on computers that used an older operating system that was considered a security risk for use on U.S. government servers. Beta version 4 restores some of the tools that were lost from version 2. Also, the outputs that list the basin characteristics and estimated streamflow statistics for user-selected ungaged sites now include maps of the site locations. All other functionality that was available in Version 2, including all tools that rely on stream-network navigation, is still in development, with a goal of having completing development by late spring of 2016. Version 3 will remain available and should be used for official purposes until version 4 is more thoroughly tested.

StreamStats functionality has been made available as Web services, which allow other Web sites or desktop GIS applications to access this functionality. The Available Web Services page describes these services in more detail.

StreamStats is best viewed using the latest versions of Internet Explorer, Microsoft Edge, Chrome, or Firefox. The browser must allow HTML5 asynchronous script execution. The application is being continually improved and expanded. Please continue to return to this page to learn of any new enhancements. Contact us if you have any questions or difficulty in using StreamStats, or to obtain information about use of StreamStats Web services.

The StreamStats Web application provides access to automated procedures and very large, complex data sets. These data sets are known to contain occasional errors. Users are advised to carefully check all results for accuracy and to exercise their own professional judgment in evaluating the appropriateness of the results for their application. Basin delineations in particular frequently have been found to be erroneous. The Web site provides tools and base maps useful for verifying the accuracy of the basin delineations.

The U.S. Geological Survey expressly disclaims responsibility for damages or liability that may arise from use of the products of this web site.