I saw this bird between the swiming platform and Evans Pool Saturday AM. The bird sure looks like a coot but has a few differences, the neck looked shorter, the body sat higher in the water, and the feet were behind the body as it paddled slowly, not under the bird like the other coots.
I took a picture with a point and shoot... here's the link http://www.flickr.com/photos/57223344 at N04/

Linda