If you have digitized a stream alignment, you can save that stream alignment as an Arc shapefile. To export the stream alignment as a shapefile, you must have a stream alignment displayed in the map window.
To export a stream alignment as an Arc shapefile:
Within the Setup module, from the Watershed menu select Stream Alignment and click Export.
A browser will open, allowing you to choose where to save the shapefile. Navigate to the appropriate folder.
The default stream alignment is stored in the watershed's main folder, but you can choose to export to a different folder (e.g., the watershed's maps folder). Enter a name in the File name field (including the .shp extension). Click Save.