Dear Ron :
Our BOSS RMS (River Modeling System) and BOSS RiverCAD applications can convert HEC-RAS models into HEC-2 models (and back again). You can download a trial version of this software from our web site.
Note that this software can convert nearly all data back and forth between these models, except bridge openings (opening areas are defined differently for the two models) and features that are not shared between the models (e.g., split flow, levees, blocked obstructions, etc.).
Here are direct links to the download pages should you want to download them :
http://www.bossintl.com/cgi-bin/download.pl?item=RMS
http://www.bossintl.com/cgi-bin/down...?item=RiverCAD
Sincerely,
Chris E. Maeder, M.S.
Senior Technical Engineer
chris.maeder@bossintl.com