http://www.cap2k.com/
at 2K, this swim is on the short side for many posters but Austin, TX, is a great destination for an open water swim.
It is an ASA swim and not a USMS swim... the swim venue is Lady Bird Lake / the former Town Lake... great hosts in Sandy and Keith Bell... postrace meal and festivities excellent and at the park proximate to the Deep Eddy Pool.