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Beta version 4 has arrived and new peak-flow equations are available for Massachusetts!

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.

New peak-flow regression equations were made available in StreamStats for Massachusetts on May 12, 2017 for estimating the 50-, 25-, 10-, 2-, 1-, 0.5, and 0.2-percent annual exceedance probabilities (Zarriello, 2017). StreamStats also 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), 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. For the equations by Zarriello (2017), StreamStats reports the uncertainty of estimates for basins with drainage areas between 0.16 to 512 square miles. Errors for basins with drainage areas beyond these bounds are unknown.


Interactive Map


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

NOTE: The streamflow statistics and basin characteristics for streamgages that were published by Zarriello (2017) are not yet available in StreamStats. This note will be removed when they become available. Until then, StreamStats users should refer to Zarriello (2017) to get peak-flow information for the streamgages.

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, the Massachusetts Environmental Trust, and the Massachusetts Department of Transportation.

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 Link to Massachusetts Department of Transportation

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