I don't have any experience with a USB run that long but it would be easy enough for you to try it and see how it works for you.
Monoprice sells really well-made cables at very good prices. The longest
standard USB cable they sell is 15 feet. To go longer than that you'd need an extension cable or an
active cable. For a total of about $10 plus shipping it would be worth a shot.
A factor in your setup decision may be that an 'audiophile' grade USB cable at that length is going to be pricey. Cardas and Audioquest, for instance, make 15' cables in the $300 range. Of course, you may not be an adherent of cable voodoo.
As I said, though, I don't have any experience with USB at that length and can't advise how it will sound but if that's the simplest solution I'd experiment with the inexpensive cables.