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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 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 if you have any questions.

StreamStats for Massachusetts can be used to estimate the long-term 99-, 98-, 95-, 90-, 85-, 80-, 75-, 70-, 65-, 60-, 55-, and 50-percent duration flows, the 7-day, 2-year and the 7-day, 10-year low flows, and the August median flow for ungaged sites (Ries and Friesz, 2000). The application also includes an equation for estimating the probability of a stream flowing perennially (Bent and Steeves, 2006), and equations for estimating bankfull geometry—width, mean depth, cross-sectional area – and bankfull discharge (Bent and Waite, 2013). The reports below present the equations used to estimate the statistics, describe the errors associated with the estimates, and describe the methods used to develop the equations and to measure the basin characteristics used in the equations. Users should familiarize themselves with the report before using StreamStats to obtain estimates of streamflow statistics for ungaged sites.

The equations from each report are applicable for most areas of Massachusetts except eastern Buzzards Bay, Cape Cod, and the Island regions, and the main branches of the Connecticut and Merrimack Rivers. Estimates obtained from the equations assume natural flow conditions at the site.

For the equations from Ries and Friesz (2000), StreamStats reports the uncertainty of the estimates for basins with drainage areas between 1.61 and 149 mi2. For equations from Bent and Steeves (2006), StreamStats reports the uncertainty of the estimates for basins with drainage areas between 0.01 and 1.99 mi2. For the equations by Bent and Waite (2013) StreamStats reports the uncertainty of the bankfull estimates for basins with drainage areas between 0.60 to 329 square miles. Errors for basins with drainage areas beyond these bounds are unknown. The prediction intervals that are presented for the bankfull estimates were determined using equations that differ from those used by Bent and Waite (2013), and as a result, the presented prediction intervals are substantially wider than the actual intervals. Limited trials indicate differences in prediction intervals of between 30 and 90 percent.

The “Estimate Flows Using Regression Equations” tool provides flow statistics at most any site, but better estimates of streamflow statistics generally can be obtained by using the “Estimate Flow Based on Similar Streamgaging Stations” tool if the site of interest has a drainage area that is between 0.3 and 1.5 times the drainage area for an gaged site on the same stream. The Ries and Friesz (2000) report describes the basis for implementing this method.


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 Massachusetts was developed in cooperation with the Massachusetts Department of Conservation and Recreation, the Massachusetts Department of Environmental Protection, the Massachusetts Geographic Information System, and the Massachusetts Environmental Trust.

Link to Department of Conservation and Recreation Link to the Massachusetts Department of Environmental Protecton Link to Massachusetts Geographic Information System Link to Massachusetts Environmental Trust

Contact Us if you experience any problems with this application.

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