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HEC-RAS has been developed for the U.S. Army Corps of Engineers. However, software developed at the Hydrologic Engineering Center is made available to the public whenever appropriate. Use is not restricted and individuals outside of the Corps of Engineers may use the program without charge. HEC will not provide user assistance or support for this software to non-Corps users. Downloading this software indicates full acceptance of your responsibility in the use of this program. Please see the distribution policy for more details.

HEC-RAS 4.1:    

This setup package includes HEC-RAS 4.1, Documentation, and Example Projects.

Download HEC-RAS 4.1 Setup Package (49.7 MB)

Supported Operating Systems:
Windows XP, Vista, and 7, both 32-bit and 64-bit

HEC-RAS 4.1 Documentation:    

Release Notes
What's New

RAS Mapper Example Data:    

This file contains an HEC-RAS model, and terrain data set to perform floodplain mapping using the RAS Mapper tool.

Download RAS Mapper Example Data (6.66 MB)

Archived Versions:    

Download HEC-RAS 4.0 (45.4 MB)
Download HEC-RAS 4.0 Beta (35.6 MB)
Download HEC-RAS 3.1.3 (39.7 MB)
Download HEC-RAS 3.1.2 (44.6 MB)
Download HEC-RAS 3.1.1 (19 MB)
Download HEC-RAS 2.2 (8 MB)