Game Mechanics: Swimming wasn't level capped in the classic era.

[Sorn]

Here's a comment from 2002: http://everquest.allakhazam.com/db/z...02174140231894

At lvl 30 I am maxed at 150 on swimming. It is almost as fast as walking or running.

That's pretty much all I've got, not a lot of direct references to any cap but plenty of mentions about how one should try to work on it to survive various places.