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Welcome to the Hydrologic Engineering Centers River Analysis System (HEC-RAS) web site. As the first of HEC's "Next Generation" (NexGen) software packages, HEC-RAS allows you to perform one-dimensional steady flow, unsteady flow, sediment transport/mobile bed computations, and water temperature modeling.

The purpose of this site is to enhance the support services we provide to our customers. We've provided a number of resources here to help you download software, resolve problems, report bugs, and suggest improvements to our products and service. Unfortunately, we are unable to provide technical support to non-USACE customers. Please review our Support Policy page for details.