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The StreamStats Program


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 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 Iowa, Indiana, North Carolina, and Oregon 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 if you have any questions.

The reports below document the regression equations available for estimating streamflow statistics at ungaged sites that are included in StreamStats for Connecticut. The included equations can provide estimates for instantaneous peak flows with recurrence intervals of 2-. 10-, 25-, 50-, 100-, and 500-years, and flow-duration statistics with flow exceedances ranging from 25 to 99 percent for six “bioperiods”—Salmonid Spawning (November), Overwinter (December–February), Habitat Forming (March–April), Clupeid Spawning (May), Resident Spawning (June), and Rearing and Growth (July–October). The reports describe the methods used to develop the equations and to measure the basin characteristics used in the equations, and the errors associated with the estimates obtained from the equations. Users should familiarize themselves with these reports before using StreamStats to obtain estimates of streamflow statistics for ungaged sites:

In addition to the above reports, a Fact Sheet is available that describes StreamStats implementation for the peak-flow equations (Ahearn, 2004). This Fact Sheet is:


Interactive Map


General information on the Interactive Map application, as well as specific sources and computation methods for basin characteristics are available here.

StreamStats for Connecticut was developed in cooperation with the Connecticut Department of Transportation and the Connecticut Department of Environmental Protection.

Link to the CT Department of Transportation
Link to the CT Department of Environmental Protection

Contact Us if you experience any problems with this application.

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