Export Pipe Networks to GIS
Rick Chappell of ATG explains how to export a Civil 3D Pipes Network to SHP format.
From the ATG YouTube Channel.
It always strikes me how important being setup to do a conversion like this beforehand is. More the half the issue is understanding what Civil 3D, Map 3D, and ArcGIS want to eat.
You also might have to deal with a coordinte system conversion of the SHP data too. A canned template (.dwt) file can handle that publishing detail easily enough.